AU2023363440B2 - Multilayer body and packaging bag - Google Patents

Abstract

This multilayer body has a structure in which at least a paper substrate, an anchor coating layer, an aluminum vapor-deposited layer, and an overcoating layer are laminated in this order. The aluminum vapor-deposited layer, when subjected to X-ray diffraction, demonstrates a peak halfwidth of the (111) crystal face of aluminum of 1.6° or greater.

Description

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DESCRIPTION DESCRIPTION

Title of of Title Invention: MULTILAYER Invention: BODY MULTILAYER AND BODY ANDPACKAGING BAG PACKAGING BAG Technical Field Technical Field

[0001] The present disclosure relates to a multilayer body and a 2023363440

5 packaging bag. Background Art

[0002] In many fields such as foods, beverages, medicines, and chemicals, packaging materials are used according to the respective 10 contents. Packaging materials are required to have properties of preventing permeation of water vapor and the like that cause deterioration of the contents (gas barrier properties). Furthermore, packaging materials are required to have oil resistance in order to prevent the oil contained in the contents from seeping out, depending on 15 15 the contents. the contents.

[0003] In recent years, due to growing environmental awareness stemming from issues such as marine plastic waste, there has been a growing momentum to reduce plastics. From the viewpoint of reducing the amount of use of plastic materials, it has been considered 20 20 to use paper instead of plastic materials in various fields. For example, the following Patent Literature 1 discloses a multilayer body in which a barrier layer is laminated on paper.

[0003a] The discussion of the background to the invention herein is intended to facilitate an understanding of the invention. However, it 25 should be appreciated that the discussion is not an acknowledgement or admission that any aspect of the discussion was part of the common

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general knowledge as at the priority date of the application.

[0003b] Unless the context requires otherwise, where the terms “comprise”, “comprises”, “comprised” or “comprising” are used in this specification (including the claims) they are to be interpreted as specifying the presence of the stated features, integers, steps or 2023363440

5 components, but not precluding the presence of one or more other features, integers, steps or components, or group thereof. Citation List Patent Patent Literature Literature

10 [0004] Patent Literature 1: Japanese Unexamined Patent Publication No. 2020-69783 Summary of Invention

[0005] Paper has a property of retaining creases (also referred to as dead hold property), and therefore has a feature that it is easily 15 15 processable. However, according to an investigation of the inventors of the present invention, it was found that there is still room for improvement in that when packaging bags (pillow packaging, three-sided seal packaging, and gusset packaging) having more acute-angled folds are produced, cracks are generated in the barrier 20 20 layer, and oil resistance is decreased.

[0006] Furthermore, from the viewpoint of the Act on the Promotion of Effective Utilization of Resources, it is required to reduce the amount of use of plastic materials even in multilayer bodies.

[0007] Thus, it is desirable to provide a multilayer body that uses paper, 25 the multilayer body having sufficient initial oil resistance and/or sufficient oil resistance even after being folded, and a packaging bag

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including this multilayer body.

[0008] The present disclosure provides the following multilayer body and packaging bag.

[1] A multilayer body comprising a structure in which at least a paper substrate, an anchor coat layer, an aluminum vapor-deposited layer, and 2023363440

5 an overcoat layer are laminated in this order, wherein in the aluminum vapor-deposited layer, a half-value width of a peak of crystal plane of aluminum in X-ray diffraction measurement is 1.6 or more and 15.0 or less. or less.

10 [2] The multilayer body according to the above-described item [1], wherein the anchor coat layer contains a polyolefin having a polar group or a polyvinyl alcohol-based resin.

[3] The multilayer body according to the above-described item [1] or

[2], wherein the overcoat layer contains a polyolefin having a polar 15 15 group.

[4] The multilayer body according to any one of the above-described items [1] to [3], wherein a hardness of the anchor coat layer as measured by a nanoindentation method at a cross-section in a thickness direction of the multilayer body is 0.3 GPa or less. 20 20 [5] The multilayer body according to any one of the above-described items [1] to [4], wherein a hardness of the overcoat layer as measured by a nanoindentation method at a cross-section in a thickness direction of the multilayer body is 0.3 GPa or less.

[6] The multilayer body according to any one of the above-described 25 25 items [1] to [5], wherein a thickness of the aluminum vapor-deposited layer is 20 nm or more and 100 nm or less.

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[7] The multilayer body according to any one of the above-described items [1] to [6], wherein in the aluminum vapor-deposited layer, a half-value width of a peak of crystal plane (111) of aluminum in X-ray diffraction measurement is 2.0 or more and 15.0 or less.

[8] The multilayer body according to the above-described item [7], 2023363440

5 wherein the aluminum vapor-deposited layer is in contact with a resin layer containing an ionomer or a polyvinyl alcohol-based resin having a degree of saponification of 95% or greater.

[9] A packaging bag including the multilayer body according to any one 10 of the above-described items [1] to [8].

[10] The packaging bag according to the above-described item [9], wherein the packaging bag has a folded part. Advantageous Effects of Invention

[0009] According to the present disclosure, a multilayer body that uses 15 15 paper, which has sufficient initial oil resistance and/or sufficient oil resistance even after being folded, and a packaging bag including this multilayer body can be provided. Since the above-described multilayer body uses paper, the multilayer body has a crease retention property, which is a characteristic of paper, and also contributes to the 20 20 reduction of the amount of use of plastic materials. Brief Description of Drawings

[0010] [FIG. 1] FIG. 1 is a schematic cross-sectional view illustrating a multilayer body according to an embodiment of the present disclosure.

[FIG. 2] FIG. 2 is a perspective view illustrating a packaging 25 bag according to an embodiment of the present disclosure.

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Description of Embodiments

[0011] Embodiments of the present disclosure will be described in detail below, with reference to the drawings as necessary. However, the present disclosure is not intended to be limited to the following embodiments. 2023363440

5 embodiments.

[0012] <Multilayer body> A multilayer body according to the present embodiment is a multilayer body having a structure in which at least a paper substrate, an anchor coat layer, an aluminum vapor-deposited layer, and an overcoat 10 layer are laminated in this order, in which in the above-described aluminum vapor-deposited layer, the half-value width of the peak of

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crystal plane crystal plane (111) (111)of ofaluminum in X-ray aluminum in X-ray diffraction diffraction measurement is measurement is

1.6 1.6° or or more. Here,the more. Here, theabove-described above-describedhalf-value half-valuewidth widthininX-ray X-ray diffraction of diffraction of the the aluminum vapor-deposited aluminum vapor-deposited layer layer represents represents thethe degree degree

of lattice of lattice distortion distortion in in the crystal structure the crystal structure of of aluminum. aluminum.When When the the

distortion is distortion is large, large, the the half-value widthbecomes half-value width becomes large, large, andand whenwhen the the distortion is distortion is small, small, the the half-value half-value width becomes width becomes small. small. Furthermore, Furthermore,

smaller distortion smaller distortion means that the means that the crystal crystal structure structure of of aluminum aluminum isis

denser. denser. In the In the above-described above-described multilayer multilayer body, body, when when the the

above-described half-value above-described half-value width width ofof the thealuminum aluminum vapor-deposited vapor-deposited

layer is layer is 1.6 1.6° or ormore, more, the the denseness of the denseness of the crystal crystal structure structure of of aluminum aluminum

can be can be appropriately appropriatelydecreased decreasedtotoobtain obtaina asparse sparsestate. state. As As a result,the a result, the stress applied stress to the applied to the aluminum aluminum vapor-deposited vapor-deposited layerlayer when when the the multilayer body multilayer bodyisisfolded foldedcan canbebedistributed distributedthroughout throughoutthethe entirelayer, entire layer, suppressingthe suppressing thegeneration generationofofcracks cracks in in thethe aluminum aluminum vapor-deposited vapor-deposited

layer when layer whenthe themultilayer multilayerbody body is folded, is folded, andand any any cracks cracks generated generated in in the aluminum the vapor-depositedlayer aluminum vapor-deposited layercan canbebemade made small. small. Therefore, Therefore,

accordingtotothe according theabove-described above-described multilayer multilayer body, body, sufficient sufficient initial initial oiloil

resistance as well as sufficient oil resistance even after being folded can resistance as well as sufficient oil resistance even after being folded can

be obtained. be obtained. Furthermore, Furthermore, according according to the to the above-described above-described multilayer multilayer

body, by body, bysetting setting the the above-described above-described half-value half-value width width of the of the aluminum aluminum

vapor-depositedlayer vapor-deposited layertotobebewithin withinthe theabove-described above-described range, range, sufficient sufficient

initial water initial water vapor barrier properties vapor barrier properties as as well wellasassufficient sufficientwater watervapor vapor barrier properties barrier properties even after being even after being folded folded can canbe be obtained. obtained.

Furthermore,according Furthermore, accordingto to theabove-described the above-described multilayer multilayer body, body, when when a a

material having material havingoxygen oxygen barrier barrier properties properties is used is used in anchor in the the anchor coat coat layer, not layer, only sufficient not only sufficient oxygen oxygenbarrier barrierproperties properties butbut also also sufficient sufficient

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oxygenbarrier oxygen barrierproperties propertieseven even after after being being folded folded canobtained can be be obtained by by setting the setting the above-described above-described half-value half-valuewidth width of the aluminum of the aluminum vapor-deposited layer to vapor-deposited layer to be within the be within the above-described above-described range. range. The The multilayer body multilayer according to body according to the the present present embodiment is useful embodiment is useful as as an an

oil-resistant multilayer body or a gas barrier multilayer body. oil-resistant multilayer body or a gas barrier multilayer body.

[0013] Furthermore, conventional

[0013] Furthermore, conventional gas gas barrier barrier multilayer multilayer bodies bodies have have

roomfor room forimprovement improvementfromfrom the viewpoint the viewpoint thatwater that the the water vapor barrier vapor barrier

properties deteriorate properties deteriorate when themultilayer when the multilayerbodies bodies areare stored stored under under high high

temperature and temperature and high humidity conditions. high humidity conditions. When Whena agasgasbarrier barrier

multilayer body multilayer bodywhose whose water water vapor vapor barrier barrier properties properties had deteriorated had deteriorated

after being after being stored under high stored under hightemperature temperatureandand high high humidity humidity conditions conditions

(in an (in anenvironment environment at at40C 40°C and and90%) 90%) was was observed observed under under aa microscope microscope

using transmitted using transmitted light, light, aa large large number number ofoftiny tinybright brightspots spotswere were recognized,and recognized, andtherefore, therefore,itit isis considered consideredthat thatthe thewater watervapor vapor barrier barrier

properties had properties had deteriorated deteriorated due duetotothe theoccurrence occurrenceofofpermeation permeation defects defects

in the in the aluminum aluminum vapor-deposited vapor-deposited layer. layer. In contrast, In contrast, since since the the multilayer body multilayer accordingtotothe body according thepresent presentembodiment embodiment includes includes an an aluminumvapor-deposited aluminum vapor-depositedlayer layer in in which whichthe thehalf-value half-value width width of of the the peak of peak of crystal crystal plane plane (111) (111) of of aluminum aluminumin inX-ray X-ray diffraction diffraction

measurement measurement is is 1.6 1.6° or or more, more, the the occurrence occurrence of permeation of permeation defectsdefects in in the aluminum the aluminum vapor-deposited vapor-deposited layer layer eveneven afterafter being being stored stored underunder high high temperature and temperature and high highhumidity humidityconditions conditionscancan be suppressed, be suppressed, and and deterioration of deterioration of the the water watervapor vaporbarrier barrierproperties properties cancan be suppressed. be suppressed.

Theinventors The inventorsofofthethepresent present invention invention speculate speculate as follows as follows aboutabout the the

reason why reason whysuch suchananeffect effectisisobtained. obtained.

[0014]

[0014] The generation of The generation of permeation permeation defects defects in in the the aluminum aluminum

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vapor-depositedlayer vapor-deposited layerisisaffected affectedbybythethepitting pittingcorrosion corrosionof ofaluminum aluminum due to due to corrosive corrosive ions, ions, and and the the stretching stretching stress stress due due to to dimensional dimensional

changes accompanied changes accompaniedbyby moisture moisture absorption absorption andand desorption desorption of the of the

paper substrate. paper substrate. From From the the viewpoint viewpoint of crystallinity of the the crystallinity of of the the

aluminum aluminum vapor-deposited vapor-deposited layer, layer, it can it can be be said said that that a highly a highly crystalline crystalline

layer is excellent in terms of the resistance to corrosive ions; however, it layer is excellent in terms of the resistance to corrosive ions; however, it

is considered is that an considered that amorphous an amorphous layer layer thateasily that easilyfollows followsexpansion expansion andand

contraction is contraction is excellent excellent in in terms of stress terms of stress resistance. Here, itit is resistance. Here, is believed that believed that the the aluminum vapor-depositedlayer aluminum vapor-deposited layer has has aastructure structure in in

whichthe which thesurroundings surroundingsof of crystallitesarearefilled crystallites filledwith withamorphous amorphous parts. parts.

Furthermore, the Furthermore, the broadening broadening ofofthe theX-ray X-raydiffraction diffraction line line width widthofof aluminum aluminum is is duedue to the to the diameter diameter of crystallites of crystallites anddistortion and the the distortion of of crystals. AAstate crystals. statewith witha narrow a narrow X-ray X-ray diffraction diffraction lineline width width is is consideredtotoindicate considered indicatea astate stateininwhich which crystallitesformed crystallites formed fromfrom idealideal

crystal lattices crystal latticesand and amorphous partsare amorphous parts areclearly clearlydivided. divided.Therefore, Therefore, it it is speculated is speculated that thatwhen whenthe the X-ray X-ray diffraction diffraction line width line width is narrow, is narrow,

pitting corrosion pitting in the corrosion in the amorphous amorphous parts parts and and destruction destruction between between the the ideal crystal ideal crystal lattices latticesoror crystals crystalsand and the the amorphous partsdue amorphous parts dueto to stretching stress stretching stress are are likely likely to to occur. Onthetheother occur. On otherhand, hand, a state with a state with aa

broadX-ray broad X-raydiffraction diffractionline linewidth width is is considered considered to indicate to indicate a state a state in in which a adistorted which distorted crystal crystal structure structure is is adopted, adopted, and andthe theseparation separation betweencrystalline between crystallineparts parts and andamorphous amorphous parts parts is is unclear.Therefore, unclear. Therefore, it it is speculated is that when speculated that theX-ray when the X-raydiffraction diffractionline linewidth widthisiswide, wide,pitting pitting corrosion and corrosion anddestruction destructionduedue to to stretching stretching stress stress areare suppressed, suppressed, and and

permeationdefects permeation defectsareareless lesslikely likelytotooccur. occur. For For the above-described the above-described

reasons, it reasons, it isisconsidered considered that thatwhen the above-described when the above-describedhalf-value half-valuewidth width

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in X-ray in X-raydiffraction diffractionofofthe thealuminum aluminum vapor-deposited vapor-deposited layer layer is or is 1.6° 1.6 or more, even more, even in in aa case case where wherethe the multilayer multilayer body body is is stored stored under high under high

temperatureand temperature andhigh highhumidity humidity conditions, conditions, thethe occurrence occurrence of permeation of permeation

defects in defects in the the aluminum aluminum vapor-deposited vapor-deposited layer layer cansuppressed, can be be suppressed, and and

deterioration of deterioration of the the water watervapor vaporbarrier barrierproperties properties cancan be suppressed. be suppressed.

Such effects Such effects are are more more notably notably provided provided inina acase casewhere where the the

above-describedhalf-value above-described half-valuewidth width isis2.0° 2.0orormore. more.

[0015] FIG.

[0015] FIG. 1 1isisa schematic a schematic cross-sectional cross-sectional viewview illustrating illustrating a a multilayer body multilayer body according according to toan anembodiment. Themultilayer embodiment. The multilayer body body1010

accordingtoto an according an embodiment embodiment includes includes a paper a paper substrate substrate 1, an 1, an anchor anchor coatcoat

layer 2, layer 2, an an aluminum vapor-deposited aluminum vapor-deposited layer layer 3, 3, andand an an overcoat overcoat layer layer 4 4 in in this order. this order.

[0016] The

[0016] The thickness thickness of of the the multilayer multilayerbody body10 10may may be be 20 20 to 100 m, to 100 um,

maybebe30 may 30toto 80 m,oror may 80 um, m.WhenWhen maybebe4040toto6060um. the thickness the thickness of of

the multilayer the multilayer body body1010is iswithin within the the above-described above-described range, range, the the multilayer body multilayer 10 can body 10 canobtain obtain more moresatisfactory satisfactory water water vapor vaporbarrier barrier properties and properties andoiloilresistance resistancenotnot onlyonly initially initially but but also also afterafter beingbeing

folded. folded.

[0017] [Papersubstrate]

[0017] [Paper substrate]

The paper The paper substrate substrate 11 may maybebepaper papercontaining containingplant-derived plant-derived pulp as pulp as aa main maincomponent. component. Specific Specific examples examples of the of the substrate paper paper substrate 1 1 include high-quality include high-qualitypaper, paper,special specialhigh-quality high-qualitypaper, paper,coated coatedpaper, paper,artart paper, cast paper, cast coated coated paper, paper, imitation imitation vellum vellum paper, paper, kraft kraft paper, paper, and and glassine paper. glassine paper. TheThe basis basis weight weight of the of the paper paper substrate substrate 1 may 1 may beto20 be 20 to

500 g/m2oror3030toto100 500 g/m2 g/m2. 100g/m².

[0018] Thepaper

[0018] The paper substrate substrate 1 may 1 may be provided be provided with awith a coating coating layer at layer at

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least on least on the the side side of of the the paper paper substrate substrate 11 in in contact contact with with the the anchor coat anchor coat

layer 2. layer When 2. When the the paper paper substrate substrate 1 includes 1 includes a coating a coating layer, layer, thethe paper paper

substrate 11 may substrate includeatatleast may include least aa paper paperlayer layerand anda acoating coatinglayer. layer.TheThe coating layer coating layer may maybebeprovided providedon on both both surfaces surfaces of of thethe paper paper substrate substrate 1. 1.

Byproviding By providingthe thecoating coatinglayer, layer,the thecoating coatinglayer layercan canprevent preventthetheanchor anchor coat layer coat layer 2 2 from penetrating into from penetrating into the the paper, paper, and can also and can also accomplish accomplishthe the role as role as a a filling filling that thatfills thethe fills surface unevenness surface unevenness of of the the paper, paper, allowing allowing

the anchor the anchor coat coat layer layer22totobebeformed formed uniformly uniformly without without defects. defects. The The

coating layer coating layer may mayuse, use,forforexample, example, various various copolymers copolymers such such as as

styrene-butadiene-based, styrene-butadiene-based, styrene-acrylic, styrene-acrylic, and and ethylene-vinyl ethylene-vinyl

acetate-based acetate-based copolymers, a copolymers, a polyvinyl alcohol-based polyvinyl alcohol-based resin, resin, aa cellulose-based resin, cellulose-based resin,or or paraffin paraffin(wax) (wax) as as binder resins, and binder resins, may and may

contain clay, contain clay, kaolin, kaolin, calcium calciumcarbonate, carbonate,talc, talc,and andmica micaas as fillers.TheThe fillers.

coating layer coating layer may maybebe a clay a clay coating coating layer layer containing containing at least at least clay clay as aas a

filler. filler.

[0019] Whenthethepaper

[0019] When paper substrate substrate 1 includes 1 includes a coating a coating layer, layer, the the

thickness of thickness of the the coating layer may coating layer may be 1.5ummorormore be1.5 more andand 15 15 mless. um or or less. Thethickness The thicknessofofthe the coating coatinglayer layer may 1.8umm maybebe1.8 or or more, more, maymay be 3 be um 3 m or more, or more, may may be morormore, be 55 um maybebe6 6umm more,orormay or or more. more. The The

thickness of thickness of the the coating coating layer layer may be1212umm may be or or less,orormay less, maybebe um m 10 10 or or less. When less. Whenthethe thicknessof ofthethe thickness coatinglayer coating layeris iswithin withinthethe above-described range, above-described range,the the multilayer multilayerbody body10 10 can can obtain obtain more more

satisfactory water satisfactory vaporbarrier water vapor barrierproperties propertiesandand oiloil resistance resistance notnot only only

initially but also after being folded. initially but also after being folded.

[0020] The thickness

[0020] The thickness of of the the paper paper substrate substrate11may may be be 20 to 100 20 to m, 100 um,

maybe may be30 30to to 80 m,oror may 80 um, m.WhenWhen maybebe4040toto6060um. the thickness the thickness of of

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the paper the substrate 11 is paper substrate is within within the the above-described range,the above-described range, themultilayer multilayer body1010can body canobtain obtainmore more satisfactory satisfactory water water vapor vapor barrier barrier properties properties andand

oil resistance not only initially but also after being folded. oil resistance not only initially but also after being folded.

[0021] Theproportion

[0021] The proportion occupied occupied by the by the thickness thickness of the of the coating coating layer layer in in

the thickness the of the thickness of the paper substrate 11 may paper substrate be3%3% may be to to 25%, 25%, or may or may be be 5% 5% to 20%. to When 20%. When this this proportion proportion is within is within the above-described the above-described range,range, the the multilayer body multilayer 10 can body 10 canobtain obtain more moresatisfactory satisfactory water water vapor vaporbarrier barrier properties and properties andoiloilresistance resistancenotnot onlyonly initially initially but but also also afterafter beingbeing

folded. folded.

[0022] The weight

[0022] The weight ofof the the paper paper is is preferably preferably 50% bymass 50% by massorormore, more, more preferably more preferably 70% bymass 70% by massorormore, more,and andeven evenmore morepreferably preferably80% 80% by mass by massorormore, more,based based on on thethe entire entire multilayerbody. multilayer body. WhenWhen the the weight of weight of the the paper paper isis 50% 50%by by mass mass or more or more basedbased on theonentire the entire multilayer body, multilayer body, the the amount amountof of use use of plastic of plastic materials materials can can be be

sufficiently reduced, sufficiently reduced, the the entire entire multilayer multilayer body maybebe body may saidtotobebemade said made of paper, and the multilayer body has excellent recyclability. of paper, and the multilayer body has excellent recyclability.

[0023] [Anchor

[0023] [Anchor coatlayer] coat layer] Theanchor The anchorcoat coatlayer layer2 2isisprovided providedon on thethe surface surface of the of the paper paper

substrate 11 and substrate is provided and is for improving provided for improving theadhesiveness the adhesiveness between between the the

paper substrate paper substrate 11 and andthe thealuminum aluminum vapor-deposited vapor-deposited layer layer 3 that 3 that willwill be be described below, described below,and and forfor improving improving the barrier the gas gas barrier properties properties and and oil oil resistance of resistance of the the multilayer multilayer body. The body. The anchor anchor coatcoat layer layer 2 may 2 may contain contain

a polyolefin a polyolefin having having aa polar polar group groupororaa polyvinyl polyvinylalcohol-based alcohol-basedresin. resin.

[0024] Whenthe

[0024] When theanchor anchorcoat coatlayer layer2 2contains containsa apolyolefin polyolefin having havingaa

polar group, polar group, the the anchor anchorcoat coatlayer layer2 2hashasexcellent excellentflexibility, flexibility, can can

suppress cracking suppress crackingofofthe thealuminum aluminum vapor-deposited vapor-deposited layerlayer 3 that 3 that will will be be

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described below described belowafter afterbending bending (afterfolding), (after folding),and andcancan also also improve improve the the

adhesiveness between adhesiveness between the the anchor anchor coat coat layer layer2 2 and and the the aluminum aluminum

vapor-depositedlayer vapor-deposited layer3.3. In In addition, addition, byby containing containing a polyolefin a polyolefin having having

a polar a polar group, group, aa dense densefilm filmcan canbebeformed formedduedue to to thethe crystallinityofofthe crystallinity the

polyolefin, and polyolefin, andwater watervapor vapor barrier barrier properties properties and resistance and oil oil resistance are are exhibited. Water exhibited. Watervapor vapor barrier barrier propertiesandand properties oil oil resistance resistance are are

exhibited due to the crystallinity of the polyolefin, and by having a polar exhibited due to the crystallinity of the polyolefin, and by having a polar

group, close group, close adhesion adhesion toto the the aluminum aluminum vapor-deposited vapor-deposited layer layer 3 3 is is exhibited. exhibited.

[0025] The polyolefin

[0025] The polyolefin having having aapolar polargroup groupmay may have have at least at least oneone

selected from selected fromaacarboxyl carboxylgroup, group,a asalt saltofofaacarboxyl carboxylgroup, group,a acarboxylic carboxylic acid anhydride acid group,and anhydride group, anda acarboxylic carboxylicacid acidester. ester.

[0026] AsAsthethepolyolefin

[0026] polyolefin having having a polar a polar group, group, a product a product obtained obtained by by copolymerizing ethylene or copolymerizing ethylene or propylene propylene with with an an unsaturated unsaturated carboxylic carboxylic

acid (an acid (an unsaturated compound unsaturated compound having having a carboxyl a carboxyl group, group, such such as acrylic as acrylic

acid, methacrylic acid, methacrylic acid, acid, orormaleic maleicanhydride) anhydride) or unsaturated or an an unsaturated carboxylic acid carboxylic acidester, ester, aa salt salt obtained byneutralizing obtained by neutralizinga acarboxylic carboxylic acid acid

with aa basic with basic compound, andthe compound, and thelike like may maybebeused, used,and andininaddition addition to to those, aa product those, obtainedbybycopolymerizing product obtained copolymerizing ethylene ethylene or propylene or propylene withwith

vinyl acetate, vinyl acetate, an an epoxy-based compound, epoxy-based compound, a chlorine-based a chlorine-based compound, compound, a a urethane-based compound, urethane-based compound,a apolyamide-based polyamide-based compound, compound, or the or the likelike

mayalso may alsobebeused. used.

[0027] Specificexamples

[0027] Specific examplesof of thepolyolefin the polyolefin having having a polar a polar group group include include

a copolymer a copolymer of of ananacrylic acrylic acid acid ester ester and and maleic maleic anhydride, anhydride, an an

ethylene-vinyl ethylene-vinyl acetate copolymer, acetate copolymer, andan ethylene-glycidyl and an ethylene-glycidyl methacrylatecopolymer. methacrylate copolymer.

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[0028] On the

[0028] On the other other hand, hand, when whenthetheanchor anchor coat coat layer2 2contains layer containsa a polyvinylalcohol-based polyvinyl alcohol-basedresin, resin,thethepolyvinyl polyvinyl alcohol-based alcohol-based resin resin has has a a polar group polar group(hydroxyl (hydroxylgroup), group),andand since since thispolar this polargroup group easily easily binds binds to to the metal the metal such such as as aluminum in the aluminum in the aluminum aluminumvapor-deposited vapor-depositedlayer layer 3, 3,

the adhesiveness the between adhesiveness between thethe aluminum aluminum vapor-deposited vapor-deposited layer layer 3 and 3the and the anchor coat anchor coat layer layer 22 can can be beeasily easily improved. improved.Furthermore, Furthermore, such such an an anchorcoat anchor coatlayer layer2 2has hasexcellent excellentflexibility flexibilityand andcan cansuppress suppress cracking cracking

of the of the aluminum aluminum vapor-deposited vapor-deposited layer layer 3 after 3 after bending bending (after(after folding). folding).

Furthermore, as Furthermore, the anchor as the anchor coat coat layer layer 22contains contains a apolyvinyl polyvinyl

alcohol-basedresin, alcohol-based resin, the the oxygen oxygenbarrier barrierproperties propertiesof of the the multilayer multilayer body body can be can be improved. improved.

[0029] Thepolyvinyl

[0029] The polyvinyl alcohol-based alcohol-based resinresin is a is a resin resin containing containing vinyl vinyl

alcohol as alcohol as aa constituent constituent unit, unit, and examples ofof the and examples thepolyvinyl polyvinyl alcohol-basedresin alcohol-based resininclude includea acompletely completely saponified saponified polyvinyl polyvinyl alcohol alcohol

resin, aa partially resin, partially saponified polyvinyl alcohol saponified polyvinyl alcohol resin, resin, a amodified modified polyvinylalcohol polyvinyl alcoholresin, resin, and andananethylene-vinyl ethylene-vinylalcohol alcohol copolymer copolymer resin. resin.

Fromthe From theviewpoint viewpointof of theoxygen the oxygen barrier barrier properties, properties, it itisispreferable preferablethat that the degree the of saponification degree of saponification of of the the polyvinyl polyvinylalcohol alcoholresin resinisis higher, higher, and and

the degree the degree ofof saponification saponificationmay maybe be 95%95% or greater, or greater, or may or may beor98% be 98% or

greater. greater.

[0030] The

[0030] Theanchor anchor coat coat layer layer 2 may 2 may contain contain bothboth a polyolefin a polyolefin having having a a polar group polar groupand andaapolyvinyl polyvinylalcohol-based alcohol-based resin. resin.

[0031] The anchor

[0031] The anchorcoat coatlayer layer2 2may may contain contain another another component component in in

addition to addition to the the above-described polyolefinhaving above-described polyolefin having a polar a polar group group andand the the

above-describedpolyvinyl above-described polyvinyl alcohol-based alcohol-based resin. resin. Examples Examples of the of the other other component include component include aa polyolefin polyolefin other other than than the the above-described above-described

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polyolefin having polyolefin havinga apolar polar group, group, a silane a silane coupling coupling agent, agent, an organic an organic

titanate, aa polyacrylic, titanate, polyacrylic, aa polyester, polyester, a a polyurethane, polyurethane, a apolycarbonate, polycarbonate,a a polyurea, aa polyamide, polyurea, polyamide,a apolyimide, polyimide,melamine, melamine, and and phenol. phenol.

[0032] The content

[0032] The content of of the the above-described above-described polyolefin polyolefin having having aa polar polar

group or group or the theabove-described above-describedpolyvinyl polyvinylalcohol-based alcohol-basedresin resinin inthethe anchorcoat anchor coatlayer layer 22 may maybe, be,for forexample, example, 50% 50% by mass by mass or more, or more, may may be be 70%bybymass 70% massorormore, more,may maybebe90% 90% by by mass mass or or more, more, or or maymay be be 100% 100%

by mass. by mass.

[0033] Thethickness

[0033] The thicknessofofthe theanchor anchor coatlayer coat layer2 2may may be be um m 0.50.5 or more, or more,

maybebe11ummorormore, may more,may may be be 2 m 2 um or more, or more, be 20beum20orm may may or less, less,

maybe may be 10 mororless, 10 um less, or or may may be 5 m be 5 or less. um or Whenthe less. When thethickness thickness of of the anchor the coat layer anchor coat layer 22 is 0.5 m is 0.5 ormore, um or more,the thesurface surfaceunevenness unevennessof of thethe

above-mentioned papersubstrate above-mentioned paper substratecan canbe be efficientlyfilled, efficiently filled, and and the the aluminumvapor-deposited aluminum vapor-depositedlayer layerthat that will will be be described described below below can canbebe

uniformly laminated uniformly laminated thereon. thereon. Furthermore, Furthermore,when whenthe thethickness thickness of of the the anchor coat anchor coat layer layer 22 is 20 m is 20 orless, um or less, the the aluminum vapor-deposited aluminum vapor-deposited

layer can layer can be uniformlylaminated be uniformly laminatedwhile while suppressing suppressing costs. costs.

[0034] Withregard

[0034] With regardtotothe theanchor anchorcoat coatlayer layer2,2,the thehardness hardnessmeasured measuredby by

a nanoindentation a method nanoindentation method in in a cross-section a cross-section inin thethickness the thicknessdirection directionofof

the multilayer the multilayerbody body 10 10 may be 0.3 may be 0.3 GPa or less. GPa or less. Such Suchanananchor anchorcoat coat layer 22 has layer has excellent excellent flexibility, flexibility, can can suppress suppress cracking of the cracking of the aluminum aluminum vapor-deposited layer33that vapor-deposited layer that will will be be described describedbelow belowafter afterbending bending(after (after folding), and folding), at the and at the same sametime, time,and andcancan also also improve improve the adhesiveness the adhesiveness

between the between the anchor anchorcoat coatlayer layer 22and andthe thealuminum aluminum vapor-deposited vapor-deposited

layer 3. layer 3.

[0035] Examplesofofthe

[0035] Examples thesolvent solvent included included inin aacoating coating liquid liquid for for the the

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anchor coat anchor coat layer layer 2 2include includewater, water,methyl methyl alcohol, alcohol, ethyl ethyl alcohol, alcohol,

isopropyl alcohol, isopropyl alcohol,in-propyl n-propyl alcohol, alcohol,in-butyl n-butyl alcohol, alcohol, in-pentyl n-pentyl alcohol, alcohol, dimethyl sulfoxide, dimethyl sulfoxide, dimethylformamide, dimethylformamide,dimethylacetamide, dimethylacetamide,toluene, toluene, hexane, heptane, hexane, heptane, cyclohexane, cyclohexane, acetone, acetone, methyl methyl ethyl ethyl ketone, ketone, diethyl diethyl

ether, dioxane, ether, dioxane, tetrahydrofuran, ethyl acetate, tetrahydrofuran, ethyl acetate, and butyl acetate. and butyl acetate. These These solvents may solvents maybebeused used singly,orortwo singly, twoor or more more kinds kinds thereof thereof may may be be used used in combination. in combination. Among these, Among these, from from the the viewpoint viewpoint ofof the the characteristics, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene, characteristics, methyl alcohol, ethyl alcohol, isopropyl alcohol, toluene,

ethyl acetate, ethyl acetate, methyl ethyl ketone, methyl ethyl ketone, and and water waterarearepreferred. preferred.

Furthermore, from Furthermore, from an an environmental environmentalviewpoint, viewpoint, methyl methylalcohol, alcohol, ethyl ethyl alcohol, isopropyl alcohol, alcohol, and isopropyl alcohol, and water waterare are preferred. preferred.

[0036] Regarding

[0036] Regarding a method a method for providing for providing the anchor the anchor coat 2, coat layer layer the 2, the

anchor coat anchor coat layer layer 22 can canbebeobtained obtainedby by applying applying a coating a coating liquid liquid

containingthe containing the above-mentioned above-mentioned polyolefin polyolefin having having a polar a polar groupgroup or theor the

polyvinyl alcohol-based polyvinyl alcohol-based resin, resin, aa solvent, solvent, and and the the like like onona apaper paper substrate, and drying the coating liquid. substrate, and drying the coating liquid.

[0037] [Aluminumvapor-deposited

[0037] [Aluminum vapor-depositedlayer] layer] The aluminum The aluminumvapor-deposited vapor-depositedlayer layer3 3isisa alayer layer obtained obtained by by vapor-depositing aluminum vapor-depositing or ananaluminum aluminum or aluminum compound. compound. The The

aluminumvapor-deposited aluminum vapor-depositedlayer layer may maybebeobtained obtainedbybyvapor-depositing vapor-depositing aluminum,orormay aluminum, may contain contain aluminum aluminum oxideoxide (AlO (AlOx), x), silicon silicon oxide oxide (SiOx), (SiOx),

or the like. or the like.

[0038] The thickness

[0038] The thickness of of the thealuminum vapor-deposited layer aluminum vapor-deposited layer 33 may may be be

appropriately appropriately set set depending onthetheuseuse depending on application;however, application; however, the the

thickness is thickness is preferably preferably 10 to 300 10 to nm,more 300 nm, morepreferably preferably2020 to to 100 100 nm,nm, andand

even more even more preferably preferably 30 30 to to 100 100 nm. When nm. When thethe thicknessofofthe thickness the

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aluminum aluminum vapor-deposited vapor-deposited layer layer 3 is3 set is set to to 10 10 nm nm or more, or more, it isiteasy is easy to to impart sufficient impart sufficient continuity continuitytotothe thealuminum aluminum vapor-deposited vapor-deposited layer layer 3, 3, and when and whenthe thethickness thicknessisis set set to to 300 300 nmnmororless, less,the the occurrence occurrenceofof curling or curling or cracking crackingcan canbebe sufficientlysuppressed, sufficiently suppressed, while while it easy it is is easy to to

achieve sufficient gas barrier performance, oil resistance, and pliability. achieve sufficient gas barrier performance, oil resistance, and pliability.

Furthermore,when Furthermore, whenthethe thickness thickness of of thethe aluminum aluminum vapor-deposited vapor-deposited layer layer

is set is set to to 20 nmorormore 20 nm more andand 100 100 nmless, nm or or less, the aluminum the aluminum

vapor-depositedlayer vapor-deposited layerbecomes becomes less less likely likely to to crack,andand crack, sufficientwater sufficient water vapor barrier vapor barrier properties propertiesand andoiloilresistance resistancecancan be be obtained obtained eveneven afterafter

folding. From folding. From thethe viewpoint viewpoint of further of further suppressing suppressing deterioration deterioration of the of the

water vapor water vaporbarrier barrierproperties propertiesofofthethemultilayer multilayer body body 10 when 10 when stored stored

underhigh under hightemperature temperatureandand high high humidity humidity conditions, conditions, the thickness the thickness of of the aluminum the vapor-deposited layer aluminum vapor-deposited layer 33 may may be be 50 50 to to300 300 nm, nm, may may be be 60 60

to 150 to nm,orormay 150 nm, maybebe6060toto100 100 nm. nm.

[0039] It is

[0039] It is preferable preferablethat thatthe thealuminum aluminum vapor-deposited vapor-deposited layer layer 3 is 3 is

formed by formed by vacuum vacuumfilm-forming film-formingmeans, means, from from thethe viewpoints viewpoints of of water water

vapor and vapor and oxygen oxygengasgasbarrier barrierperformance, performance,oiloilresistance, resistance, and andfilm film uniformity. Examples uniformity. Examples of of the the film-forming film-forming means means include include known known methodssuch methods suchasasa vacuum a vacuum vapor vapor deposition deposition method, method, a sputtering a sputtering

method, and method, and aa chemical chemical vapor vapor phase phase deposition depositionmethod method (CVD method); (CVD method);

however,from however, fromthethe viewpoint viewpoint of exhibiting of exhibiting a high a high film film deposition deposition rate rate and high and highproductivity, productivity,aavacuum vacuum vapor vapor deposition deposition method method is preferred. is preferred.

Furthermore, among Furthermore, amongvacuum vacuum vapor vapor deposition deposition methods, methods, film-forming film-forming

meansusing means usingelectron electronbeam beam heating heating in particular in particular is is effectivebecause effective because thethe

film deposition film deposition rate rate can can be beeasily easily controlled controlledbybythe theirradiation irradiation area, area, the the electron beam electron beamcurrent, current,andand thethe like,andand like, thethe temperature temperature of vapor of the the vapor

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deposition material deposition materialcan canbebeincreased increased or or decreased decreased in ainshort a short period period of of time. time.

[0040] The aluminum

[0040] The aluminumvapor-deposited vapor-depositedlayer layer33isis aa layer layer in in which the which the

half-value width half-value widthof of the the peak peakof of crystal crystal plane (111) of plane (111) of aluminum aluminum inin X-ray X-ray

diffraction measurement diffraction measurement isis1.6° 1.6or or more. more. The above-described The above-described half-value width half-value widthmay maybebe 1.8 1.8° or or more, more, maymay be 2.0 be 2.0° or more, or more, orbemay or may be 2.1 or 2.1° or more. more.When When this this half-value half-value widthwidth is 1.6 is 1.6° or more, or more, the the occurrence of occurrence of cracks cracks in in the the aluminum vapor-deposited layer aluminum vapor-deposited layer 33 can can be be

suppressedwhen suppressed whenthethe multilayer multilayer body body 10folded, 10 is is folded, and and deterioration deterioration of of

the gas barrier properties and oil resistance after fold can be suppressed. the gas barrier properties and oil resistance after fold can be suppressed.

Such an Such an effect effect is is more more notably notably provided provided inin a acase casewhere wherethethe above-described half-value above-described half-value width width isis2.0 or or 2.0° more. more. Furthermore, Furthermore, when when

the above-described the above-describedhalf-value half-value width width is 1.6 is 1.6° or more, or more, even even in a in a case case wherethe where themultilayer multilayerbody body10 10 is is storedunder stored under high high temperature temperature and and highhigh

humidityconditions humidity conditions(for (forexample, example,inin anan environment environment at 40C at 40°C and and 90%),90%),

the occurrence the occurrenceofofpermeation permeation defects defects in in thethe aluminum aluminum vapor-deposited vapor-deposited

layer 33 can layer can be besuppressed, suppressed,andand deterioration deterioration of of thethe water water vapor vapor barrier barrier

properties of properties of the the multilayer multilayer body 10can body 10 canbebesuppressed. suppressed.SuchSuch an effect an effect

is also is also provided more notably provided more notablywhen whenthethe above-described above-described half-value half-value

width is width is 2.0 2.0° or or more. From more. From thethe viewpoint viewpoint of of thethe denseness denseness of of thethe

aluminum aluminum crystalstructure, crystal structure,the theupper upperlimit limitvalue valueofofthe thehalf-value half-valuewidth width maybe, may be,for forexample, example,15.0° 15.0 or or less,orormay less, maybe be 10.0 10.0° or or less.WhenWhen less. the the resin layer resin layer in in contact contact with with the the aluminum vapor-deposited aluminum vapor-deposited layer layer contains contains

an ionomer an ionomerorora apolyvinyl polyvinylalcohol-based alcohol-basedresin resinhaving having a degree a degree of of

saponification of saponification of 95% 95%or ormore, more, thethe aluminum aluminum vapor-deposited vapor-deposited layer layer is is easily corroded. easily Whenthethealuminum corroded. When aluminum vapor-deposited vapor-deposited layer layer hashas lowlow

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crystallinity, such crystallinity, such problems arelikely problems are likelyto to occur. occur. When the When the above-describedhalf-value above-described half-valuewidth width is is 15.0 15.0° or or less, less, even even when when the resin the resin

layer in layer in contact contact with withthe thealuminum aluminum vapor-deposited vapor-deposited layer layer contains contains an an ionomer or ionomer or aa polyvinyl polyvinyl alcohol-based alcohol-based resin resin having having aa high high degree degreeofof

saponification, corrosion saponification, corrosion of of the the aluminum aluminum vapor-deposited vapor-deposited layerlayer is less is less

likely to likely to occur. Such occur. Such an an effectisisalso effect alsomore more notably notably provided provided in aincase a case wherethe where theabove-described above-described half-value half-value width width is 10.0 is 10.0° or less. or less. In order In order

to achieve to achieve both bothofofthe theabove-described above-described effects, effects, thethe half-value half-value width width is is preferably 1.6° preferably 1.6 or or more moreand and15.0° 15.0ororless, less,1.6° 1.6 or or more moreand and10.0° 10.0or less, or less,

1.6 1.6° or or more and7.0° more and 7.0or or less, less, 1.6 1.6° or or more and5.0° more and 5.0 or or less, less, 2.0 2.0° or or more more

and 15.0or less, 2.0 or more and 10.0or less, 2.0 or more and 7.0 or and 15.0° or less, 2.0° or more and 10.0° or less, 2.0° or more and 7.0° or

less, or 2.0 or more and 5.0 or less. less, or 2.0° or more and 5.0° or less.

[0041] Thehalf-value

[0041] The half-valuewidth width (2) (20) of the of the peak peak of crystal of crystal plane plane (111) (111) of of

aluminumininthe aluminum the aluminum aluminumvapor-deposited vapor-depositedlayer layer33isis measured measuredusing using

an X-ray an X-raydiffraction diffraction apparatus. apparatus.As As the the X-ray X-ray diffraction diffraction apparatus, apparatus, for for example, ATX-G example, (trade name) ATX-G (trade name)manufactured manufacturedbybyRigaku RigakuCorporation Corporationcan can be used. be Themeasurement used. The measurement can can bebe carriedout carried out from fromabove abovethe the overcoat overcoat layer 44 by layer using the by using the multilayer multilayerbody bodyasasa asample, sample, and and fixing fixing thethe sample sample

on aa slide on slide glass. glass. AsAsthetheX-ray X-ray diffraction diffraction of of aluminum, aluminum, the half-value the half-value

widthatat the width the peak peakatat202= = 38.5 38.5° corresponding corresponding to plane to the the plane (111)(111) (d = (d = 2.34) is 2.34) is measured. measured. TheThe measurement measurement conditions conditions are asare as follows. follows.

Light source: Light source: CuKa CuK line line

Tubevoltage: Tube voltage:5050kVkV Tube current: Tube current: 300 300 mA mA

Optical system: Optical system:Parallel Parallel beam beamoptical opticalsystem system Scan method: Scan method: 20/0 2/ method method

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Measurement range: Measurement range: 30°30 to to 50°50

Samplingstep: Sampling step:0.02° 0.02 Scan speed:2°/min Scan speed: 2/min Slit Slit

S1: S1: 10.0 mm X 1.0 10.0 mm 1.0 mm mm

S2: 10.0 S2: mm X 0.5 10.0 mm 0.5 mm mm

Sollar Sollar (res): (res):0.4 0.4mm mm

[0042] The above-described

[0042] The above-describedhalf-value half-value width widthcancanbe be controlled controlled by by

adjusting the adjusting the conditions conditions atat the the time time of of film filmdeposition depositionofofthe thealuminum aluminum

vapor-deposited layer 3. vapor-deposited layer Forexample, 3. For example,the thehalf-value half-valuewidth widthcan canbebe controlled by controlled by adjusting adjusting the the pressure pressure inside inside the the vapor depositionchamber vapor deposition chamber during film during film deposition depositionofof the the aluminum aluminum vapor-deposited vapor-deposited layer layer 3. Here, 3. Here,

whenthe when thepressure pressureinside insidethe thevapor vapordeposition deposition chamber chamber is increased, is increased, the the

half-value width half-value width can be increased, can be increased, and whenthe and when the pressure pressure inside inside the the

vapor deposition vapor deposition chamber chamberisis decreased, decreased, the the half-value half-value width width can can bebe decreased. From decreased. From the the viewpoint viewpoint thatisiteasy that it is easy to adjust to adjust the half-value the half-value

width to width to be be 1.6° 1.6 oror more, more,the thepressure pressureinside inside the the vapor vapordeposition deposition chamberduring chamber during film film deposition deposition of of thethe aluminum aluminum vapor-deposited vapor-deposited layer layer 3 may 3 be 0.05 may be 0.05 Pa Pa or or more, more, may be 0.10 may be 0.10 Pa Pa or or more, more, or or may be 0.20 may be 0.20 Pa Pa

or more. or more. The The upper upper limit limit value value of of thethe pressure pressure is is notnot particularly particularly

limited as limited as long longasasitit is is in in the the range rangecapable capableof offilm film deposition deposition of the of the

aluminumvapor-deposited aluminum vapor-depositedlayer layer3;3;however, however,for forexample, example,thetheupper upper limit limit value value may be0.50 may be 0.50PaPaororless, less, or or may be0.40 may be 0.40PaPaororless. less.

[0043] [Overcoatlayer]

[0043] [Overcoat layer]

Theovercoat The overcoatlayer layer4 4isis provided providedononthe thesurface surfaceofofthe thealuminum aluminum vapor-deposited layer vapor-deposited layer 33 SO so as as toto bebeinincontact contactwith withthe thealuminum aluminum

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vapor-deposited layer3.3.TheThe vapor-deposited layer overcoat overcoat layerlayer may contain may contain a polyolefin a polyolefin

havingaa polar having polar group. group.

[0044] The polyolefin

[0044] The polyolefin having having aapolar polargroup groupmay may have have at least at least oneone

selected from selected fromaacarboxyl carboxylgroup, group,a asalt saltofofaacarboxyl carboxylgroup, group,a acarboxylic carboxylic

acid anhydride acid group,and anhydride group, anda acarboxylic carboxylicacid acidester. ester.

[0045] Asthe

[0045] As thepolyolefin polyolefin having having a polar a polar group, group, a product a product obtained obtained by by copolymerizing ethylene copolymerizing ethylene or or propylene propylene with with an an unsaturated unsaturated carboxylic carboxylic acid (an acid (an unsaturated compound unsaturated compound having having a carboxyl a carboxyl group, group, such such as acrylic as acrylic

acid or acid or methacrylic methacrylicacid) acid)ororananunsaturated unsaturatedcarboxylic carboxylic acid acid ester,a salt ester, a salt

obtained bybyneutralizing obtained neutralizinga acarboxylic carboxylicacid acidwith with a basic a basic compound, compound, and and the like the like may maybebeused, used,andand in in addition addition to those, to those, a product a product obtained obtained by by copolymerizing ethylene copolymerizing ethylene or or propylene propylene with withvinyl vinylacetate, acetate,anan epoxy-based compound, epoxy-based compound,a achlorine-based chlorine-basedcompound, compound, a urethane-based a urethane-based

compound, compound, a polyamide-based a polyamide-based compound, compound, or the or themay like likealso maybealso be used. used.

[0046] Specificexamples

[0046] Specific examplesof of thepolyolefin the polyolefin having having a polar a polar group group include include

a copolymer a copolymerof ofan an acrylic acrylic acidacid ester ester and and maleic maleic anhydride, anhydride, an an ethylene-vinyl acetate ethylene-vinyl copolymer, and acetate copolymer, andan ethylene-glycidyl an ethylene-glycidyl methacrylatecopolymer. methacrylate copolymer.

[0047] Bycontaining

[0047] By containing a polyolefin a polyolefin having having a polar a polar group, group, the overcoat the overcoat

layer 44 has layer has excellent excellent flexibility, flexibility, can can suppress suppress cracking in the cracking in the aluminum aluminum vapor-deposited layer vapor-deposited layer after after bending bending(after (after folding), folding), and andalso alsohashas excellent adhesiveness excellent to the adhesiveness to the aluminum aluminumvapor-deposited vapor-depositedlayer. layer.In In addition, by addition, containingthe by containing theabove-mentioned above-mentioned polyolefin polyolefin having having a polar a polar

group, it group, it is is possible possible to to form form aa dense densefilm filmdue duetotothe thecrystallinity crystallinity of of the the

polyolefin, and polyolefin, andwater watervapor vapor barrier barrier properties properties and resistance and oil oil resistance are are exhibited. Furthermore, exhibited. Furthermore, by having by having a polar a polar group, group, the adhesion the adhesion to the to the

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aluminumvapor-deposited aluminum vapor-depositedlayer layer is is exhibited. exhibited. Furthermore, Furthermore, since since the the overcoat layer overcoat layer 44 can canalso alsofunction functionasasaaheat heatseal seal layer layer by bycontaining containingthe the above-describedpolyolefin above-described polyolefinhaving having a polar a polar group, group, a heat a heat sealseal layer layer does does

not have not have to to be be provided providedseparately. separately.

[0048] Theovercoat

[0048] The overcoat layer layer 4 may 4 may contain contain other other components components in addition in addition

to the to the above-described above-described polyolefin polyolefinhaving havinga apolar polargroup. group. Examples of Examples of

the other the other components componentsinclude includea silane a silanecoupling coupling agent, agent, an an organic organic

titanate, aa polyacrylic, titanate, polyacrylic, aa polyester, polyester, a a polyurethane, polyurethane, a apolycarbonate, polycarbonate,a a polyurea, aa polyamide, polyurea, polyamide,a apolyolefin-based polyolefin-basedemulsion, emulsion, a polyimide, a polyimide,

melamine,and melamine, andphenol. phenol.

[0049] The content

[0049] The content ofofthe thepolyolefin polyolefinhaving havinga apolar polargroup group in the in the

overcoat layer overcoat layer 44 may be, for may be, for example, example, 50% by mass 50% by massorormore, more,may maybebe 70%bybymass 70% massorormore, more,may maybebe90% 90% by by mass mass or or more, more, or or maymay be be 100% 100%

by mass. by mass.

[0050] Thethickness

[0050] The thicknessofofthetheovercoat overcoat layer layer 4 may 4 may be, be, for for example, example, 0.050.05

moror more, um more, may maybebe0.5 morormore, 0.5um more,may maybebe umm 1 1 or or more, more, maymay be be 2 2 morormore, um more,maymay be um be 20 mless, 20 or or less, may may be 10 be or m um 10 ororless, less, mayor bemay 5 be 5 mororless. um less. When When the thickness the thickness of overcoat of the the overcoat layer layer um or m 4 is 0.05 4 is 0.05 or more, the more, the overcoat overcoat layer layer 44can cansufficiently sufficiently exhibit exhibit the the role role as as the the

above-mentionedheat above-mentioned heat seal seal layer. layer. Furthermore, Furthermore, when whenthe thethickness thickness of of the overcoat the layer 44 is overcoat layer is 20 mororless, 20 um less, the the adhesiveness adhesivenesstotothe thealuminum aluminum vapor-deposited layerandand vapor-deposited layer the the barrier barrier properties properties can can be be sufficiently sufficiently

exhibited while exhibited whilesuppressing suppressingcosts. costs.Furthermore, Furthermore, when when the thickness the thickness of of the overcoat the overcoat layer layer 44 is settoto2 2m is set um or or more and 1010umm more and or or less,the less, the

aluminumvapor-deposited aluminum vapor-depositedlayer layerbecomes becomes lessless likely likely to to crack, crack, andand

sufficient water sufficient water vapor barrier properties vapor barrier properties and oil resistance and oil resistance can can be be

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obtained even obtained evenafter after being beingfolded. folded.

[0051] Withregard

[0051] With regardtotothe themultilayer multilayerbody body10,10, when when a polyolefin a polyolefin having having

a polar a groupisis incorporated polar group incorporatedinto intothe theovercoat overcoatlayer layer4,4,the thethickness thicknessofof the overcoat the overcoat layer layer 44isis set to 22 m set to um orormore moreandand 10 10 mless, um or or less, and and the the

thickness of thickness of the the aluminum aluminum vapor-deposited vapor-deposited layerlayer 3 is 3 is toset20tonm20or nm set or more and more and100100 nm nm or less, or less, the the aluminum aluminum vapor-deposited vapor-deposited layer layer 3 3 becomesless becomes lesslikely likelytotocrack, crack,andand an an effect effect that that sufficientwater sufficient water vapor vapor

barrier properties and oil resistance can be obtained even after folding is barrier properties and oil resistance can be obtained even after folding is

particularly notably particularly notably provided. provided.

[0052]

[0052] In In the overcoat layer the overcoat layer 4, 4, the the hardness hardness measured measuredby by a a

nanoindentationmethod nanoindentation method at cross-section at a a cross-section in the in the thickness thickness direction direction of of the multilayer the body1010may multilayer body maybe be 0.30.3 GPa GPa or less. or less. Such Such an overcoat an overcoat layer layer

4 has 4 has excellent excellent flexibility, flexibility, can cansuppress suppress cracking cracking in in the the aluminum aluminum

vapor-depositedlayer vapor-deposited layer3 3after afterbending bending (afterfolding), (after folding),and and cancan suppress suppress

deterioration of the gas barrier properties and oil resistance. deterioration of the gas barrier properties and oil resistance.

[0053] Examples

[0053] Examples of the of the solvent solvent included included in a coating in a coating liquid liquid for the for the

overcoat layer overcoat layer 44 include includewater, water,methyl methylalcohol, alcohol,ethyl ethylalcohol, alcohol,isopropyl isopropyl alcohol, in-propyl alcohol, n-propyl alcohol, alcohol, in-butyl n-butyl alcohol, alcohol, in-pentyl n-pentyl alcohol, alcohol, dimethyl dimethyl sulfoxide, dimethylformamide, sulfoxide, dimethylacetamide,toluene, dimethylformamide, dimethylacetamide, toluene,hexane, hexane,

heptane, cyclohexane, heptane, cyclohexane, acetone, acetone, methyl methylethyl ethylketone, ketone,diethyl diethylether, ether, dioxane, tetrahydrofuran, dioxane, tetrahydrofuran, ethyl ethyl acetate, acetate, and butyl acetate. and butyl acetate. These These solvents may solvents maybebeused used singly,orortwo singly, twoor or more more kinds kinds thereof thereof may may be be used used in combination. in combination.Among Among these,these, from from the the viewpoint viewpoint of characteristics, of characteristics,

methylalcohol, methyl alcohol,ethyl ethylalcohol, alcohol,isopropyl isopropylalcohol, alcohol,toluene, toluene,ethyl ethylacetate, acetate,

methyl ethyl methyl ethyl ketone, ketone, and water are and water are preferred. Furthermore, from preferred. Furthermore, fromanan environmental viewpoint, environmental viewpoint, methyl methylalcohol, alcohol,ethyl ethylalcohol, alcohol,isopropyl isopropyl

21

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alcohol, and alcohol, waterare and water are preferred. preferred.

[0054] Regarding aa method

[0054] Regarding methodforforproviding providingthetheovercoat overcoat layer4, 4,thethe layer

overcoat layer 44 can overcoat layer can be beobtained obtainedbybyapplying applying a coating a coating liquidcontaining liquid containing the above-mentioned the polyolefin above-mentioned polyolefin having having a polar a polar group, group, a solvent, a solvent, and and the the

like on like the aluminum on the aluminumvapor-deposited vapor-depositedlayer, layer, and anddrying dryingthe thecoating coating liquid. The liquid. Themelting melting point point of of thethe polyolefin polyolefin having having a polar a polar group group in the in the

coating liquid coating liquid is is preferably preferably 70C to 160°C, 70°C to 160C,and andmore more preferably preferably 80C 80°C to to 120C. When 120°C. When the melting the melting pointpoint ofpolyolefin of the the polyolefin having having a polar a polar group group

is low, is there is low, there is an advantagethat an advantage thatthe thestart-up start-uptemperature temperature during during heatheat

sealing can sealing can be be made lower. When made lower. Whenthethe meltingpoint melting pointofofthe the polyolefin polyolefin havingaapolar having polar group groupisislow, low,there there is is aa high risk that high risk that blocking blocking may occur may occur

in aa high in high temperature temperatureenvironment. Fromthe environment. From theviewpoint viewpointof of preventing preventing blocking, to blocking, to make makethethe contact contact area area smaller, smaller, it it is is betterforforthetheparticle better particle size to be larger. Although there is no particular limitation, the particle size to be larger. Although there is no particular limitation, the particle

size may size be specifically may be specifically 11nm nm or or more, more, may be0.1 may be morormore, 0.1 um more,and and maybebe1 1umm may or or less, 0.7umm less,0.7 or or less,oror0.5 less, mororless. 0.5um less.

[0055] (Method

[0055] (Method forfor processing processing cross-section cross-section of of measurement measurement sample sample by by nanoindentation method) nanoindentation method)

In the In the measurement by aa nanoindentation measurement by nanoindentation method, method, measurement measurement

of the of the anchor coatlayer anchor coat layer 22 and andthe theovercoat overcoatlayer layer4 4isisperformed performed from from a a cross-section cross-section of of the the multilayer multilayerbody body 10. 10. AAmultilayer multilayer body bodysample sample including an including ananchor anchorcoat coatlayer layer 2 and 2 and an overcoat an overcoat layerlayer 4 is 4cut is into cut into a a strip shape strip shape or or a a wedge shapewith wedge shape with a razor a razor andand embedded embedded in a in a resin. resin. A A photocurable resin photocurable resin (for (forexample, example,D-800 D-800 manufactured by TOAGOSEI manufactured by TOAGOSEI

CO., LTD.)isisused CO., LTD.) usedasasthe theembedding embedding resin, resin, which which is is cured cured by by irradiation irradiation

with light with light after afterbeing being embedded. The embedded. The sample-embedded sample-embedded resinresin after after

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curing is curing is fixed fixedininan aninsert insertforfor an an AFM AFM sample sample holder, holder, trimming trimming and and

cross-section cutting of cross-section cutting of the the multilayer multilayer body bodyare areperformed performed with with a glass a glass

knife at knife at normal normaltemperature temperature(25°C), (25C), andand cross-section cross-section cutting cutting is is performedusing performed usinga adiamond diamond knife knife under under the the setting setting of aofcutting a cutting speed speed of of

1.0 1.0 mm/s and mm/s and a cut a cut film film thickness thickness of 200 of 200 nm until nm until a mirror a mirror surface surface is is obtained. The obtained. Thecross-sectioned cross-sectioned sample sample is is used used for for the themeasurement measurement by by

the nanoindentation the method, nanoindentation method, in in a a stateofofbeing state beingfixed fixedininthe theinsert insert for for an an AFMsample AFM sample holder. holder. Ascross-section As the the cross-section cutting cutting apparatus, apparatus, for for example, an example, an ultramicrotome ultramicrotomeEMUC7 EMUC7 manufactured manufactured by Leica by Leica can becan be

used. Furthermore, used. Furthermore, the the cutting cutting direction direction is is setset totoa adirection directionparallel parallel to to the layer interface. the layer interface.

[0056] (Measurementmethod

[0056] (Measurement methodbybynanoindentation nanoindentationmethod) method) The hardnesses The hardnesses and and complex complexelastic elastic moduli moduli of of the the anchor anchor coat coat layer and layer the overcoat and the overcoat layer layer represent represent the the hardnesses hardnesses and and complex complex

elastic moduli elastic moduli calculated calculatedbyby the the nanoindentation nanoindentationmethod. The method. The

nanoindentation method nanoindentation is aa measurement method is measurementmethod method in in which which a a quasi-static indentation quasi-static indentation test test is is performed ona target performed on a targetobject object of of measurement,and measurement, andthethemechanical mechanical characteristicsofofthe characteristics thesample sampleareare acquired. AsAsthethe acquired. measurement measurement apparatus, apparatus, for example, for example, Hysitron Hysitron

TI-Premier (trade TI-Premier (trade name) manufacturedbybyBruker name) manufactured BrukerJapan Japan K.K. K.K. cancan be be used. As As used. the the indenter, indenter, a Berkovich a Berkovich type type diamond diamond indenter indenter

manufactured by manufactured by Bruker Bruker Japan Japan K.K. K.K.can canbe be used. used. InInthe themeasurement measurement by the by the nanoindentation nanoindentation method, method, first, first, aa diamond indenter is diamond indenter is scanned scanned

across aa cross-section across cross-section of of aa sample sampletotoacquire acquire a topographical a topographical image image of of

the sample, the sample, and andthe themeasurement measurement position position on on the the desired desired layer layer is is specified. Thereafter, specified. Thereafter, in in aa displacement displacementcontrol controlmode mode at normal at normal

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temperature(25°C), temperature (25C),indentation indentationtotoa adepth depth of of 80 80 nm nm is performed is performed at anat an indentation speed indentation speedofof 80 80nm/second, nm/second, subsequently subsequently the the indenter indenter is held is held forfor

11 second at the second at the maximum depth, maximum depth, andand thenthen the the load load is removed is removed at a at a speed speed

of 80 of nm/second. InInthethemethod 80 nm/second. method of of calculatingthe calculating thehardness hardnessand andthe the

complexelastic complex elasticmodulus, modulus, fused fused quartz quartz as as a standard a standard sample sample is tested is tested in in advance, and advance, and the therelationship relationship between betweenthe thedepth depthofofcontact contactof ofthethe indenter with indenter withthe thesample sampleandand thethe contact contact projection projection areaarea is calibrated. is calibrated.

Thereafter, the Thereafter, theunloading unloading curve curve in inthe theregion regionofof60% 60% to to 95% for the 95% for the maximum maximum loadload at the at the time time of unloading of unloading is analyzed is analyzed byOliver-Pharr by the the Oliver-Pharr

method, and method, and the the hardness hardness and and the the complex complexelastic elastic modulus modulusare are calculated. calculated.

[0057] Thehardnesses

[0057] The hardnesses of of thethe anchor anchor coat coat layer layer 2 and 2 and thethe overcoat overcoat layer layer

4 as 4 as measured measuredbyby thethe nanoindentation nanoindentation method method at a cross-section at a cross-section in thein the thickness direction thickness direction of of the the multilayer multilayerbody body10 10 maymay be GPa be 0.3 0.3 or GPa or less. less.

This can This canalleviate alleviatedirect direct transmission transmissionofofthethedeformation deformation stress stress in the in the

paper substrate paper substrate caused caused bybybending bendingof of thethe multilayer multilayer body body to to the the aluminum aluminum vapor-deposited vapor-deposited layer, layer, and and prevent prevent the generation the generation of defects of defects

in the in the aluminum vapor-deposited aluminum vapor-deposited layer, layer, deterioration deterioration of the of the gas gas barrier barrier

properties and properties and oil oilresistance resistanceafter bending after cancanbebesuppressed. bending suppressed. From From

this viewpoint, this viewpoint, the the hardnesses of the hardnesses of the anchor anchor coat coatlayer layer 2 2and andthethe overcoat layer overcoat layer44may maybe be 0.25 0.25 GPa GPa or less, or less, or may or may be 0.2beGPa 0.2orGPa or less. less. Thelower The lowerlimit limitof of thethe hardness hardness is not is not particularly particularly limited; limited; however, however,

fromthe from theviewpoint viewpointof ofobtaining obtaining sufficient sufficient strength strength forfor maintaining maintaining the the

gas barrier gas barrier properties properties and andoil oilresistance, resistance, the thelower lowerlimit limitcan canbe be setset to to

0.05 MPa 0.05 or more. MPa or more.

[0058] Inorder

[0058] In ordertotoform form a flexible a flexible anchor anchor coatcoat layer layer 2 and2 aand a flexible flexible

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overcoat layer overcoat layer 44 in in which whichthe thehardness hardnessmeasured measuredby by the the nanoindentation nanoindentation

methodatata across-section method cross-section in in thethe thickness thickness direction direction of the of the multilayer multilayer

body1010isis0.3 body 0.3GPaGPa or less, or less, thethe anchor anchor coat coat layerlayer 2 and2 the andovercoat the overcoat layer 44 may layer maybebeformed formed using using resin resin materials materials whose whose dried dried coating coating film film

has an has an elongation elongation at at break break ofof preferably preferably 150% 150%or or more, more, andand moremore

preferably 200% preferably or more, 200% or more, as as measured measured in in accordance accordance with with JIS JIS KK 7161 7161 in an in an atmosphere atmosphere at at20C 20°Cand and65%RH. 65%RH.

[0059] <Packagingbag>

[0059] <Packaging bag> FIG. 22 is FIG. is aa perspective perspective view viewillustrating illustrating aa gusset gusset bag bag2020formed formed

from the from the multilayer multilayerbody body 10. 10. AApackaging packagingbag bagisis produced produced by by sealing sealing the opening the at the opening at the top top of of the the gusset gusset bag bag 20. The 20. The gusset gusset bagbag 20 20 hashas sites sites

where the where the multilayer multilayer body 10 is body 10 is folded folded (folded (folded parts partsB1 B1and and B2). B2). AA

folded part folded part B1 is aa site B1 is site where the multilayer where the multilayer body body1010isisvalley-folded valley-foldedasas viewedfrom viewed from thethe innermost innermost layerlayer side,side, and aand a folded folded part part B2 is B2 is a site a site

where the where the multilayer multilayer body 10 is body 10 is mountain-folded mountain-folded as as viewed viewedfrom fromthe the innermostlayer innermost layerside. side.

[0060] The packaging

[0060] The packaging bag bagmay maybebeformed formedinto intoa abag bagshape shapebybyfolding folding one sheet one sheet of of the the multilayer multilayerbody bodyinintwotwo such such that that thethe overcoat overcoat layers layers 4 4 of the of the two parts face two parts face each eachother, other, subsequently subsequentlyappropriately appropriately folding folding thethe

multilayer body multilayer bodyinto intoaa desired desiredshape, shape,and andthen thenheat-sealing heat-sealingthe theresultant, resultant, or may or beformed may be formedinto intoaabag bagshape shapebybysuperposing superposingtwo twosheets sheetsofofthe the multilayer body multilayer bodysuch such thatthetheovercoat that overcoat layers layers 4 the 4 of of the two two sheets sheets face face

each other, each other, and then heat-sealing and then heat-sealing the the multilayer multilayer bodies. bodies.

[0061] With regard

[0061] With regard toto the thepackaging packagingbagbag according according to the to the present present

embodiment, embodiment, thethe heat heat sealstrength seal strengthmaymay beN 2orNmore, be 2 or more, or be or may may4 Nbe 4N or more. or more.In In addition, addition, thethe upper upper limit limit value value of the of the heat heat seal seal strength strength is is

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not particularly not particularly limited; limited; however, the upper however, the upperlimit limitvalue valuemay maybe be 10 10 N N or or less. less.

[0062] Thepackaging

[0062] The packagingbagbag cancan accommodate accommodate contents contents such assuch as and foods foods and pharmaceutical products pharmaceutical products asascontents. contents.Particularly Particularlyforfor foods, foods, the the

packagingbag packaging bagisissuitable suitablefor for accommodating accommodating confectionery confectionery and like. and the the like. The packaging The packagingbag bagaccording accordingtoto the the present present embodiment canmaintain embodiment can maintain high gas high gasbarrier barrier properties properties and andoil oilresistance resistanceeven evenwhen when thethe packaging packaging

bag has bag has aa shape shapewith withfolded foldedparts. parts.

[0063] Inthe

[0063] In thepresent presentembodiment, embodiment, a gusset a gusset bag bag has been has been described described as as

an example an exampleofofthe thepackaging packaging bag; bag; however, however, for for example, example, a pillow a pillow bag, bag, a a three-sided sealed three-sided sealed bag, bag, or or aa standing standing pouch pouchmay may also also be be produced produced using using

the multilayer the bodyaccording multilayer body accordingtotothe thepresent presentembodiment. embodiment. Examples Examples

[0064] Hereinafter,

[0064] Hereinafter,the thepresent presentdisclosure disclosure will will be described be described in in more more

detail by detail by way ofExamples; way of Examples;however, however, thethe present present disclosure disclosure is is notnot

intended to be intended to be limited limited to to these these examples. examples.

[0065] <Production

[0065] <Production of of multilayer multilayer body> body>

(Example1) (Example 1) An aqueous An aqueousdispersion dispersionofofa apolyolefin polyolefinincluding includinga asalt salt ofof aa

carboxyl group carboxyl group (manufactured (manufactured bybySumitomo Sumitomo SeikaSeika Chemicals Chemicals

Company,Limited., Company, Limited., trade trade name: name:ZAIKTHENE ZAIKTHENE AC, particle AC, particle size:size: lessless

than 0.2 than m,solvent: 0.2 um, solvent:water/IPA water/IPA= = 1/11/1 (mass (mass ratio),solid ratio), solidcontent content concentration: 22.5% concentration: 22.5% by by mass) mass) was applied on was applied the surface on the surface on a on a

clay-coated layerside clay-coated layer sideofofa apaper papersubstrate substrate having having a clay-coated a clay-coated layerlayer

with thicknessofof 55umm(thickness with aa thickness (thickness including including thethe clay-coated clay-coated layer: layer: 55 55 m)with um) witha abar barcoater, coater,and andthe theresulting resultingcoating coatingwas wasdried driedininananoven oven to to

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forman form ananchor anchorcoat coatlayer layerhaving havinga athickness m. thicknessofof3 3um.

[0066] Subsequently,AlAl

[0066] Subsequently, vapor vapor deposition deposition was was performed performed on theon the anchor anchor

coat layer coat layer by by aa vacuum vacuumvapor vapor depositionmethod, deposition method, andand an an Al Al vapor-deposited layer vapor-deposited layer (aluminum (aluminumvapor-deposited vapor-deposited layer) layer) having having a a

thickness ofof 50 thickness 50 nm was formed. nm was formed. TheThe pressureinside pressure insidethe thevapor vapor deposition chamber deposition duringthe chamber during thevapor vapordeposition depositionof of aluminum aluminum was was adjusted to adjusted to the the value value shown shown ininTable Table1.1.

[0067] Next,ananaqueous

[0067] Next, aqueous dispersion dispersion of of a polyolefin a polyolefin containing containing a saltofofa a a salt

carboxylgroup carboxyl group(manufactured (manufactured by Mitsui by Mitsui Chemicals, Chemicals, Inc., name: Inc., trade trade name:

CHEMIPEARL CHEMIPEARL S100, particle S100, particle size: size: less than less than 0.1 um, m, solvent: 0.1solvent: water/IPA water/IPA

= 1/1 = 1/1 (mass (mass ratio), ratio), solid solidcontent contentconcentration: concentration:20.0% 20.0%by by mass) mass) was was

applied on applied on the the Al Al vapor-deposited vapor-deposited layer layer with witha abar barcoater, coater, and andthe the resulting coating resulting wasdried coating was driedinin an anoven oventotoform formanan overcoat overcoat layer layer having having

a thickness a of 33 m. thickness of um. As As a result,a amultilayer a result, multilayerbody body waswas obtained. obtained.

[0068] (Example2)

[0068] (Example 2) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example Example 1,1,except exceptthat thatthe thepressure pressureinside insidethe thevapor vapordeposition depositionchamber chamber at the at the time time of of forming theAlAlvapor-deposited forming the vapor-deposited layer layer waswas changed changed to to the the value shown value shownininTable Table1.1.

[0069] (Example3)

[0069] (Example 3) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example1,1,except Example exceptthat that the the paper papersubstrate substrate was waschanged changedtotoa apaper paper substrate having substrate having aa clay-coated clay-coatedlayer layerwith thicknessofof55umm withaathickness (thickness (thickness

including the including the clay-coated clay-coatedlayer: layer: 50 m). 50 um).

[0070] (Example4)

[0070] (Example 4) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in

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Example1,1,except Example exceptthat thatthe theanchor anchor coat coat layer layer waswas formed formed by by the the following method. following method. That That is,is, an an aqueous aqueous dispersion dispersion ofpolyolefin of a a polyolefin containing aa salt containing salt of of aa carboxyl carboxyl group (manufactured by group (manufactured Mitsui by Mitsui

Chemicals, Inc., Chemicals, Inc., trade tradename: name: CHEMIPEARL CHEMIPEARL S100,S100, particle particle size: size: less less

than 0.1 than m,solvent: 0.1 um, solvent:water/IPA water/IPA= = 1/11/1 (mass (mass ratio),solid ratio), solidcontent content concentration: 20.0% concentration: bymass) 20.0% by mass)waswas applied applied on the on the surface surface on on the the clay-coated layer clay-coated layerside sideof of a paper a paper substrate substrate (thickness (thickness including including the the clay-coated layer: clay-coated layer: 55 m) 55um) using using a bar a bar coater, coater, andand the the resulting resulting coating coating

wasdried was driedinin an anoven oventotoform formanananchor anchor coat coat layer layer having having a thickness a thickness of of

33 m. um.

[0071] (Example5)

[0071] (Example 5) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example1,1,except Example except thatanan that overcoat overcoat layer layer waswas formed formed byfollowing by the the following method. That method. Thatis,is,ananaqueous aqueousdispersion dispersionofofaapolyolefin polyolefin containing containing aa

salt of salt of aa carboxyl carboxyl group (manufactured group (manufactured by by Mitsui Mitsui Chemicals, Chemicals, Inc., Inc., trade trade

name: CHEMIPEARL name: CHEMIPEARL S500,S500, particle particle size: size: 0.70.7 m, um, solvent:water/IPA solvent: water/IPA== 1/1 (mass ratio), 1/1 (mass ratio), solid solid content content concentration: concentration:20.0% by mass) 20.0% by mass)was was applied on applied the Al on the Al vapor-deposited vapor-deposited layer layer using using aa bar bar coater, coater, and the and the

resulting coating resulting wasdried coating was driedinin an anoven oventotoform formanan overcoat overcoat layer layer having having

a thickness a thickness of 3 m. of 3 um.

[0072] (Examples66 and

[0072] (Examples and 7) 7) Multilayer bodies Multilayer bodies were wereobtained obtainedininthe thesame same manner manner as as in in Example1,1,except Example exceptthat thatthe thepressure pressureinside insidethe thevapor vapordeposition depositionchamber chamber at the at the time time of of forming theAlAlvapor-deposited forming the vapor-deposited layer layer waswas changed changed to to the the

values shown values shownin in Table Table 1, 1, andand the the thickness thickness of Al of the thevapor-deposited Al vapor-deposited layer was layer changedtotothe was changed thevalues valuesshown shownin in Table Table 1. 1.

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[0073] (Example8)

[0073] (Example 8) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example1,1,except Example exceptthat thatthe theanchor anchor coat coat layer layer waswas formed formed by by the the following method. following method.ThatThat is, is, a solution a solution obtained obtained by dissolving by dissolving a a

polyvinylalcohol polyvinyl alcohol(PVA) (PVA) resinhaving resin having a degree a degree of of saponification saponification of 98% of 98%

and aa degree and degreeofofpolymerization polymerizationof of 500500 in ainsolvent a solvent of water/IPA of water/IPA = 8/2= 8/2 (mass ratio) at (mass ratio) at aa solid solid content content concentration concentration of of 10% bymass, 10% by mass,was was applied ononthe applied theclay-coated clay-coated layer layer side side of aofpaper a paper substrate substrate (thickness (thickness

including the including the clay-coated clay-coated layer: 55 m) layer:55 using aa bar um) using bar coater, coater, and the and the

resulting coating resulting coatingwas was dried dried in in an an oven oven to to form an anchor form an anchor coat coat layer layer havingaa thickness having thicknessof m. of 33 um.

[0074] (Example9)

[0074] (Example 9) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example8,8,except Example exceptthat thatthe thepressure pressureinside insidethe thevapor vapordeposition depositionchamber chamber

at the at the time time of of forming theAlAlvapor-deposited forming the vapor-deposited layer layer waswas changed changed to to the the value shown value shownininTable Table2.2.

[0075] (Comparative Examples

[0075] (Comparative Examples11and and2) 2) Multilayer bodies Multilayer bodies were were obtained obtainedininthe thesame same manner manner as as in in Example1,1,except Example exceptthat thatthe thepressure pressureinside insidethe thevapor vapordeposition depositionchamber chamber

at the at the time time of of forming theAlAlvapor-deposited forming the vapor-deposited layer layer waswas changed changed to to the the values shown values shownininTable Table2.2.

[0076] (Comparative Example

[0076] (Comparative Example3)3) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example Example 8,8,except exceptthat thatthe thepressure pressureinside insidethe thevapor vapordeposition depositionchamber chamber

at the at the time time of of forming theAlAlvapor-deposited forming the vapor-deposited layer layer waswas changed changed to to the the value shown value shownininTable Table2.2.

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[0077] <Preparationofofpaper

[0077] <Preparation papersubstrate> substrate> Thefollowing The followingclay-coated clay-coated papers papers 1 to 1 to 3 and 3 and non-coated non-coated paper paper 4 4 wereprepared were preparedasaspaper papersubstrates. substrates. Clay-coated paper Clay-coated paper 1:1:The The dimensional dimensional change change ratios ratios whenwhen

subjected to subjected to aa change changefrom froma temperature a temperature of of 40C 40°C and aand a relative relative

humidityofof20%RH humidity 20%RHto atotemperature a temperature of 40C of 40°C and aand a relative relative humidity humidity of of 90%RH 90%RH were were CD CD = 0.75%, = 0.75%, MD MD = 0.13%, = 0.13%, basisbasis weight: weight: 60 60 g/m2 g/m²

Clay-coated paper 2:2:The Clay-coated paper Thedimensional dimensional change change ratios ratios whenwhen

subjected to subjected to aa change changefrom froma temperature a temperature of of 40C 40°C and aand a relative relative

humidityofof20%RH humidity 20%RHto atotemperature a temperature of 40C of 40°C and aand a relative relative humidity humidity of of 90%RH 90%RH were were CD CD = 0.55%, = 0.55%, MD MD = 0.07%, = 0.07%, basisbasis weight: weight: 60 60 g/m2 g/m2

Clay-coated paper 3:3:The Clay-coated paper Thedimensional dimensional change change ratios ratios whenwhen

subjected to subjected to aa change changefrom froma temperature a temperature of of 40C 40°C and aand a relative relative

humidityofof20%RH humidity 20%RHto atotemperature a temperature of 40C of 40°C and aand a relative relative humidity humidity of of

90%RH 90%RH were were CD CD = 0.35%, = 0.35%, MD MD = 0.15%, = 0.15%, basisbasis weight: weight: 60 60 g/m2 g/m2

Non-coated paper Non-coated paper 4: 4: The The dimensional dimensional change change ratios ratios when when subjected to subjected to aa change changefrom froma temperature a temperature of of 40C 40°C and aand a relative relative

humidityofof20%RH humidity 20%RHto atotemperature a temperature of 40C of 40°C and aand a relative relative humidity humidity of of 90%RH 90%RH were were CD CD = 1.34%, = 1.34%, MD MD = 0.03%, = 0.03%, basisbasis weight: weight: 62 62 g/m2 g/m2

[0078] <Production

[0078] <Productionof of multilayer multilayer body> body>

(Example10) (Example 10) Theclay-coated The clay-coatedpaper paper 1 was 1 was prepared prepared as theaspaper the substrate. paper substrate. Anaqueous An aqueous dispersion dispersion ofpolyolefin of a a polyolefin containing containing a salt a salt of a of a carboxyl carboxyl

group (manufactured group (manufactured by by Sumitomo Sumitomo Seika Seika Chemicals Chemicals Company, Company,

Limited., trade Limited., trade name: ZAIKTHENE name: ZAIKTHENE AC, particle AC, particle size:than size: less less 0.2 thanum, 0.2 m, solvent: water/IPA solvent: water/IPA= 1/1 = 1/1 (mass (mass ratio), ratio), solid solid content content concentration: concentration:

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22.5%bybymass) 22.5% mass) waswas applied applied on the on the surface surface on the on the clay-coated clay-coated layer layer sideside

of the of the paper paper substrate substrate using usinga agravure gravurecoater, coater,and andthethe resultingcoating resulting coating wasdried was driedinin an anoven oventotoform formanan anchor anchor coat coat layer layer having having a thickness a thickness of of 3 m. 3 um.

[0079] Subsequently, an

[0079] Subsequently, Al vapor-deposited an Al vapor-deposited layer layer was formedononthe was formed the anchorcoat anchor coatlayer layerininaaroll-to-roll roll-to-roll induction heating type induction heating type vacuum vacuum vapor vapor

deposition apparatus. deposition apparatus. TheThe pressure pressure inside inside the the vaporvapor deposition deposition

chamberduring chamber duringAlAlvapor vapor deposition deposition and and the thickness the thickness of Al of the the Al vapor-deposited layerwere vapor-deposited layer wereadjusted adjustedtotothe thevalues valuesshown shownin in Table Table 3. 3.

[0080] Next,ananaqueous

[0080] Next, aqueous dispersion dispersion of of a polyolefin a polyolefin containing containing a saltofofa a a salt

carboxylgroup carboxyl group(manufactured (manufactured by Mitsui by Mitsui Chemicals, Chemicals, Inc., name: Inc., trade trade name: CHEMIPEARL CHEMIPEARL S100, particle S100, particle size: size: less than less than 0.1 um, m, solvent: 0.1solvent: water/IPA water/IPA

= 1/1 = 1/1 (mass (mass ratio), ratio), solid solidcontent contentconcentration: concentration:20.0% 20.0%by by mass) mass) was was

applied on applied onthe the Al Alvapor-deposited vapor-deposited layer layer using using a gravure a gravure coater, coater, andand the the

resulting coating resulting wasdried coating was driedinin an anoven oventotoform formanan overcoat overcoat layer layer having having

a thickness a of 33 m. thickness of um. As As a result,a amultilayer a result, multilayerbody body waswas obtained. obtained.

[0081] (Example11)

[0081] (Example 11) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example10, Example 10,except exceptthat thatthethe paper paper substrate substrate waswas changed changed to to the the

clay-coated paper clay-coated paper 2, 2, and andthe thepressure pressureinside insidethe thevapor vapordeposition deposition chamberatat the chamber the time time of of forming forming the the Al Al vapor-deposited vapor-deposited layer layer and and the the thickness of thickness of the theAlAlvapor-deposited vapor-deposited layer layer werewere changed changed to theto the values values

shownininTable shown Table3.3.

[0082] (Example12)

[0082] (Example 12)

A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example10,10,except Example except thatthe that theAlAlvapor-deposited vapor-deposited layer layer waswas formed formed by by the the

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following method. following Thatis,is,the method. That the Al Al vapor-deposited vapor-deposited layer layer was was formed formed on the on the anchor anchorcoat coatlayer layerininaa roll-to-roll roll-to-roll EB heating type EB heating typevacuum vacuum vapor vapor

deposition apparatus. deposition apparatus. TheThe pressure pressure inside inside the vapor the vapor deposition deposition

chamberduring chamber duringAlAlvapor vapor deposition deposition and and the thickness the thickness of Al of the the Al

vapor-depositedlayer vapor-deposited layerwere wereadjusted adjustedtotothe thevalues valuesshown shownin in Table Table 3. 3.

[0083] (Example13)

[0083] (Example 13) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example12, Example 12,except exceptthat thatthethe paper paper substrate substrate waswas changed changed to to the the clay-coated paper clay-coated paper2.2.

[0084] (Example14)

[0084] (Example 14) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as inas in Example12, Example 12,except exceptthat thatthethe paper paper substrate substrate waswas changed changed to to the the clay-coated paper clay-coated paper3.3.

[0085] (Example15)

[0085] (Example 15)

Theclay-coated The clay-coatedpaper paper2 2was was prepared prepared as as thethe paper paper substrate. substrate. A A solution obtained solution obtainedbybydissolving dissolvinga apolyvinyl polyvinyl alcohol alcohol having having a degree a degree of of saponification saponificationofof98% and aa degree 98% and degreeofofpolymerization polymerization ofof500 500 (manufactured by (manufactured by Kuraray KurarayCo., Co.,Ltd., Ltd., trade trade name: name: POVAL POVAL 5-98) 5-98) in ain a solvent of solvent of water/IPA water/IPA= =8/2 8/2(mass (mass ratio)atata asolid ratio) solidcontent contentconcentration concentration

of 10% of bymass, 10% by mass,was wasapplied appliedononthe thesurface surfaceononthe theclay-coated clay-coated layer layer side of side of the the paper papersubstrate substrateusing using a gravure a gravure coater, coater, andresulting and the the resulting coating was coating dried in was dried in an oven to an oven to form form anananchor anchorcoat coatlayer layer having havinga a thickness of 44 m. thickness of um.

[0086] Subsequently, an

[0086] Subsequently, Al vapor-deposited an Al vapor-deposited layer layer was formedononthe was formed the

anchor coat anchor coat layer layer in in aaroll-to-roll roll-to-roll EB heating type EB heating type vacuum vacuum vapor vapor

deposition apparatus. deposition apparatus. TheThe pressure pressure inside inside the the vaporvapor deposition deposition

32

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chamberduring chamber duringAlAl vapor vapor deposition deposition and and the thickness the thickness of Al of the the Al vapor-deposited layerwere vapor-deposited layer wereadjusted adjustedtotothe thevalues valuesshown shownin in Table Table 3. 3.

[0087] Next,ananaqueous

[0087] Next, aqueous dispersion dispersion of of a polyolefin a polyolefin containing containing a saltofofa a a salt

carboxylgroup carboxyl group(manufactured (manufactured by Mitsui by Mitsui Chemicals, Chemicals, Inc., name: Inc., trade trade name:

CHEMIPEARL CHEMIPEARL S500,S500, particle particle size: size: um,m, 0.70.7 solvent: solvent: water/IPA water/IPA = 1/1 = 1/1

(massratio), (mass ratio), solid solid content content concentration: concentration:20.0% 20.0%by by mass) mass) was applied was applied

on the on the Al Al vapor-deposited vapor-depositedlayer layerusing usinga agravure gravure coater,and coater, andthetheresulting resulting coating was coating was dried dried inin ananoven ovento toform form an overcoat an overcoat layer layer having having a a thickness of 33 m. thickness of um. As As a result,a amultilayer a result, multilayerbody body waswas obtained. obtained.

[0088] (Example16)

[0088] (Example 16) A multilayer A multilayer was obtained in was obtained in the the same mannerasasinin Example same manner Example 15, 15, except that the except that the paper paper substrate substrate was changedtotothe was changed theclay-coated clay-coatedpaper paper 1, 1, and the pressure and the pressure inside insidethe thevapor vapordeposition deposition chamber chamber at the at the timetime of of

forming the forming the AlAlvapor-deposited vapor-depositedlayer layerand andthethe thicknessof of thickness thethe Al Al

vapor-depositedlayer vapor-deposited layerwere werechanged changed to to thethe values values shown shown in Table in Table 3. 3.

[0089] (Example17)

[0089] (Example 17) Thenon-coated The non-coatedpaper paper 4 was 4 was prepared prepared as the as the paper paper substrate. substrate. A A solution obtained solution obtainedbybydissolving dissolvinga apolyvinyl polyvinyl alcohol alcohol having having a degree a degree of of saponification ofof98% saponification and aadegree 98% and degreeofofpolymerization polymerization ofof500 500

(manufactured by (manufactured by Kuraray KurarayCo., Co.,Ltd., Ltd., trade trade name: name: POVAL POVAL 5-98) 5-98) in ain a solvent of solvent of water/IPA water/IPA= =8/2 8/2(mass (mass ratio)atata asolid ratio) solidcontent contentconcentration concentration of 10% of 10% bybymass, mass,waswas applied applied on on oneone surface surface of the of the paper paper substrate substrate using using

a gravure a coater, and gravure coater, and the the resulting resulting coating coating was wasdried driedininananoven oventotoform form an anchor an anchorcoat coatlayer layer having havingaathickness m. thicknessofof33um.

[0090] Subsequently, an

[0090] Subsequently, Al vapor-deposited an Al vapor-deposited layer layer was formedononthe was formed the anchor coat anchor coat layer layer in in aaroll-to-roll roll-to-roll EB heating type EB heating type vacuum vacuum vapor vapor

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deposition apparatus. deposition apparatus. TheThe pressure pressure inside inside the vapor the vapor deposition deposition

chamberduring chamber duringAlAlvapor vapor deposition deposition and and the the thickness thickness of Al of the the Al vapor-deposited layerwere vapor-deposited layer wereadjusted adjustedtotothe thevalues valuesshown shownin in Table Table 4. 4.

[0091] Next, ananaqueous

[0091] Next, aqueous dispersion dispersion of ethylene-acrylic of an an ethylene-acrylic acid acid

copolymerresin copolymer resin(manufactured (manufactured by by Michelman, Michelman, Inc., Inc., trade trade name: name:

MC9100, MC9100, solid solid content content concentration: concentration: 20%20% by mass) by mass) was applied was applied on the on the Al vapor-deposited Al vapor-deposited layer layer using using a agravure gravurecoater, coater,and andthetheresulting resulting coating was coating was dried dried inin ananoven ovento toform form an overcoat an overcoat layer layer having having a a thickness of 33 m. thickness of um. As As a result,a amultilayer a result, multilayerbody body waswas obtained. obtained.

[0092] (Comparative

[0092] (Comparative Examples Examples 4 to 46)to 6)

Multilayer bodies Multilayer bodies were wereobtained obtainedininthe thesame same manner manner as as in in Example10, Example 10,except exceptthat thatthethepressure pressure inside inside thethe vapor vapor deposition deposition

chamberatat the chamber the time time of of forming forming the the Al Al vapor-deposited vapor-deposited layer layer and and the the thickness of thickness of the theAlAlvapor-deposited vapor-deposited layer layer werewere changed changed to theto the values values

shownininTable shown Table4.4.

[0093] (Comparative Example

[0093] (Comparative Example7)7) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as in as in Example12, Example 12,except exceptthat thatthethepressure pressure insidethethe inside vapor vapor deposition deposition

chamberatat the chamber the time time of of forming forming the the Al Al vapor-deposited vapor-deposited layer layer and and the the

thickness of thickness of the theAlAlvapor-deposited vapor-deposited layer layer werewere changed changed to theto the values values

indicated in Table 4. indicated in Table 4.

[0094] (Comparative

[0094] (Comparative Example Example8)8) A multilayer A multilayer body bodywas wasobtained obtained in in thethe same same manner manner as in as in Example15, Example 15,except exceptthat thatthethepressure pressure inside inside thethe vapor vapor deposition deposition

chamberatat the chamber the time time of of forming forming the the Al Al vapor-deposited vapor-deposited layer layer and and the the thickness of thickness of the theAlAlvapor-deposited vapor-deposited layer layer werewere changed changed to theto the values values

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indicated in Table 4. indicated in Table 4.

[0095] <Measurement

[0095] <Measurement of film of film thickness thickness ofvapor-deposited of Al Al vapor-deposited layer> layer>

A multilayer A multilayer body body was wasembedded embedded in ainUV-curable a UV-curable resin resin and and subjected toto cross-section subjected cross-sectioncutting cuttingusing usinga acryomicrotome cryomicrotome to produce to produce a a

cross-section cross-section observation observation sample. Thecross-section sample. The cross-section of of this this sample sample wasobserved was observedunder under an an electron electron microscope microscope at aatmagnification a magnification of 50000 of 50000

times, and times, and aa SEM imagewas SEM image wasacquired. acquired. The The thicknessofofthe thickness the Al Al vapor-deposited layer vapor-deposited layer was measuredfrom was measured fromthetheobtained obtainedSEMSEM image. image.

Theresults The results are are shown shown ininTable Table11totoTable Table4.4.

[0096] <X-ray diffraction

[0096] <X-ray diffraction measurement> measurement>

Measurement Measurement of of thethe half-value half-value width width of of thethe peak peak of of crystal crystal plane plane

(111) of (111) of aluminum aluminum in in thethe Al Al vapor-deposited vapor-deposited layerlayer was carried was carried out byout by the following the procedure.ForFor following procedure. the the measurement measurement of theofhalf-value the half-value width, width,

an X-ray an X-ray diffraction diffraction apparatus apparatus(trade name: (trade name:ATX-G) manufactured by ATX-G) manufactured by

RigakuCorporation Rigaku Corporation was was used. used. CuKa CuK line line was was used asused as thesource, the light light source, the tube the voltage was tube voltage wasset set to to 50 50 kV, kV,the the tube tubecurrent currentwas wasset settoto300 300mA, mA,a a parallel beam parallel optical system beam optical system was wasused used as as the the optical optical system, system, the the

scanning method scanning methodwas was20/0 2/method, method,the themeasurement measurement range range waswas setset to to

30 to 30° to 50°, 50, and the scan and the scan speed was set speed was set to to 2°/min. 2/min. Furthermore, Furthermore,the the

sampling stepwas sampling step wassetsettoto0.02°, 0.02,and andthetheslits slits were wereset settotoS1: S1:10.0 X  10.0mmmm 1.0 1.0 mm, S2:10.0 mm, S2: 10.0mmmm  0.5 X 0.5 mm,mm, and Sollar and Sollar (res): (res): 0.4 0.4 mm. mm. Each ofEach the of the

multilayer bodies multilayer bodiesobtained obtainedinin Examples Examplesand andComparative ComparativeExamples Examples was was

used asasaasample, used sample,thethepaper paper substrate substrate side side of of thethe multilayer multilayer bodybody was was stuck onto stuck onto aa slide slide glass glass using a double-sided using a double-sidedtape, tape,and andX-ray X-raydiffraction diffraction

measurementwas measurement wasperformed. performed.As the As the X-ray X-ray diffraction diffraction of of aluminum, aluminum,

the half-value the half-value width at the width at the peak at 2 peak at = 38.5° 20 = 38.5 corresponding correspondingtotothe theplane plane

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(111) (111) (d (d == 2.34) 2.34) was was measured. The measured. The resultsare results are shown shownininTable Table1 1toto Table 4. Table 4.

[0097] <Method

[0097] <Method forfor processing processing sample sample cross-section> cross-section>

Samples formeasuring Samples for measuring the the hardnesses hardnesses andcomplex and the the complex elastic elastic

moduli of moduli of the the anchor anchor coat coatlayer layer and andthetheovercoat overcoatlayer layerfrom from cross-sections of cross-sections of the multilayer bodies the multilayer bodies obtained obtained inin Examples Examplesandand

ComparativeExamples Comparative Examples were were produced produced by following by the the following procedure. procedure.

First, aa multilayer First, multilayer body was cut body was cut with witha arazor razorsuch such thata sample that a sample including an including an anchor anchorcoat coatlayer layerand andananovercoat overcoat layer layer would would havehave a strip a strip

shape or shape or aa wedge shape, and wedge shape, and the the obtained obtained sample sample was wasembedded embeddedin in a a resin. D-800 resin. D-800photocurable photocurableresin resinmanufactured manufacturedbybyTOAGOSEI TOAGOSEI CO., CO., LTD.was LTD. wasused used as as theembedding the embedding resin, resin, andand thisthis waswas cured cured by irradiation by irradiation

with light with light after afterembedding. Thesample-embedded embedding. The sample-embedded resin resin aftercuring after curing was fixed was fixed in in an insert for an insert forananAFM sample holder, AFM sample holder, trimming trimming and and

cross-section cutting cross-section cutting of of the the film film were wereperformed performedat at normal normal temperature temperature

(25C) using aa glass (25°C) using glass knife, knife, and cross-section cutting and cross-section cuttingwas was performed performed

using aa diamond using diamond knife knife at at a cutting a cutting speed speed of 1.0 of 1.0 mm/sec mm/sec and a and a cutting cutting

film thickness film thickness of of 200 nmuntil 200 nm until aa mirror mirror surface surface was obtained. The was obtained. The cross-sectioned sample cross-sectioned sample was used for was used forthethemeasurement measurement by aby a

nanoindentationmethod, nanoindentation method, in ainstate a state of being of being fixedfixed in anininsert an insert for for an an AFMsample AFM sampleholder. holder.As As the the cross-sectioncutting cross-section cutting apparatus, apparatus, an an ultramicrotome EMUC7 ultramicrotome manufactured bybyLeica EMUC7 manufactured Leica was was used.used. Furthermore,the Furthermore, thecutting cuttingdirection directionwas wassetset to to a directionparallel a direction paralleltotothe the layer interface. layer interface.

[0098] <Measurementofofhardness

[0098] <Measurement hardnessand andcomplex complexelastic elastic modulus> modulus>

The hardnesses The hardnesses and andthe the complex complexelastic elastic moduli moduliofofthe the anchor anchor

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coat layer coat layer and and the the overcoat overcoatlayer layerrepresent representthe thehardnesses hardnessesandand complex complex

elastic moduli elastic moduli calculated calculated by by aa nanoindentation nanoindentation method. method. TheThe nanoindentation method nanoindentation is aa measurement method is measurementmethod method in in which which a a quasi-static indentation quasi-static indentation test test is is performed ona target performed on a targetobject object of of

measurement,and measurement, andthethemechanical mechanical characteristicsofofthe characteristics thesample sampleareare acquired. AsAsthe acquired. themeasurement measurement apparatus,Hysitron apparatus, HysitronTI-Premier TI-Premier(trade (trade name) manufactured name) manufacturedbybyBruker BrukerJapan JapanK.K. K.K.was wasused. used.As As thethe indenter, indenter,

a Berkovich a typediamond Berkovich type diamond indenter indenter manufactured manufactured by Bruker by Bruker Japan Japan K.K. K.K. wasused. was used.In In thethe measurement measurement bynanoindentation by the the nanoindentation method,method, first, afirst, a

diamondindenter diamond indenter waswas scanned scanned across across a cross-section a cross-section of theofsample the sample to to acquire aa topographical acquire topographical image image ofof the the sample, sample,and andthe themeasurement measurement position on position the desired on the desired layer layer was specified. Thereafter, was specified. Thereafter, in a in a

displacementcontrol displacement controlmode modeat at normal normal temperature temperature (25C), (25°C), indentation indentation to to a depth a depth of of 80 80 nm nmwas wasperformed performedat atananindentation indentation speed speed of of 80 80

nm/second, subsequently nm/second, subsequently the the indenter indenter was washeld heldfor for1 1second second at at thethe

maximum maximum depth, depth, andand then then the the load load was was removed removed at a speed at a speed of 80 of 80 nm/second.In the nm/second. In the method method of calculating of calculating the hardness the hardness andcomplex and the the complex elastic modulus, elastic fused quartz modulus, fused quartz as as aastandard standardsample sample waswas tested tested in in advance, and advance, and the therelationship relationship between betweenthe thedepth depthofofcontact contactof ofthethe

indenter with indenter with the the sample sampleand andthethecontact contactprojection projection area area was was calibrated. calibrated.

Thereafter, the Thereafter, theunloading unloading curve curve in inthe theregion regionofof60% 60% to to 95% for the 95% for the maximumload maximum loadat atthethetime time of of unloading unloading waswas analyzed analyzed by by the the Oliver-Pharrmethod, Oliver-Pharr method,andand the the hardness hardness andand the the complex complex elastic elastic modulus modulus

werecalculated. were calculated. TheThe results results areare shown shown in Table in Table 1 to1 Table to Table 4. 4.

[0099] <Measurement

[0099] <Measurement of elongation of elongation at break> at break

In the In the measurement measurement of of theelongation the elongation at at break break of of theanchor the anchor coat coat

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layer and layer the overcoat and the overcoatlayer, layer, coating coating liquids liquids for for forming the anchor forming the anchorcoat coat layer and layer the overcoat and the overcoatlayer layerwere wereapplied appliedonon a supporting a supporting substrate substrate andand

dried, the dried, the resulting resulting coatings coatings were peeledfrom were peeled from thesupporting the supporting substrate, substrate,

the layers the layers were punched were punched intoa type into a type 1A 1A dumbbell dumbbell shapeshape to obtain to obtain a a test test

piece, and piece, and the the elongation elongationatatbreak breakwas wasmeasured measured based based on on the the method method

described in described in JIS JIS K7161. K7161.As the As apparatus, the apparatus, an Autograph an Autograph testing testing

machine AGS-X machine (manufactured by AGS-X (manufactured by SHIMADZU CORPORATION) SHIMADZU CORPORATION) was was used, the used, the tensile tensile test testspeed speedwas was set set to to50 50mm/min, andmeasurement mm/min, and measurementwas was madeinin an made anenvironment environmentatata atemperature temperatureofof20°C 20Cand anda ahumidity humidity of of

65%.TheThe 65%. results results areare shown shown in Table in Table 1 to1Table to Table 4. 4.

[0100] <MeasurementofofKIT

[0100] <Measurement KITvalue> value> Thedegree The degreeofofoiloilresistance resistance(KIT (KIT value) value) of the of the surface surface on on the the overcoat layer overcoat layerside sideofofthe themultilayer multilayerbodies bodiesobtained obtained in in Examples Examples and and Comparative Examples Comparative Examples was was measured measured by by the the TAPPI TAPPI UM-557 method UM-557 method

(KITmethod). (KIT method).Furthermore, Furthermore, whilewhile a roller a roller weighing weighing 1500 g1500 was g was rolled rolled at aa speed at speed of of 300 300 mm/min, mm/min, a acrease crease parallel parallel to to the theMD direction was MD direction was

provided in provided in the the multilayer multilayer body body such suchthat that the the multilayer multilayer body bodywas was valley-folded as valley-folded as viewed viewedfrom from thepaper the paper substrate substrate side(with side (withthetheovercoat overcoat layer on layer the outer on the outer surface), surface), and the degree and the degreeofofoil oil resistance resistance (KIT (KITvalue) value)

of the of the crease crease portion portionofofthe themultilayer multilayer body body after after unfolding unfolding was was also also measuredin measured in the the same manner. TheThe same manner. KITKIT value value is is expressedasasgrade expressed grade00 to grade to grade 12, 12, and and aahigher highernumber number indicatesa ahigher indicates higherdegree degree of of oiloil

resistance. The resistance. The highest highest point point of of thethe degree degree of oil of oil resistance resistance given given by by the KIT the KITtest test liquid liquid that that shows nopenetration shows no penetration was wasregarded regardedas asthethe

evaluation result. evaluation result. The The KIT KIT value value is preferably is preferably 6 or 6 or more, more, andand whenwhen the the value is value is smaller smallerthan than6,6,the theoil oilresistance resistancefor forfood foodpackaging packaging may may be be

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insufficient. The insufficient. Theresults resultsare areshown showninin Table1 1totoTable Table Table4.4.

[0101] <Measurement

[0101] <Measurement of water of water vapor vapor transmission transmission rate> rate>

For the For the multilayer multilayer bodies bodies obtained obtained inin Examples and Examples and Comparative Comparative Examples, Examples, the the water water vapor vapor transmission transmission rate (g/m2/day) rate (g/m2/day) in in

an atmosphere an atmosphere of of 40C and 90%RH 40°C and 90%RHwaswas measured measured by the by the Mocon Mocon

method according method according to to JIS JIS K7129-2. For the K7129-2. For the measurement, measurement, aa water water vapor transmission vapor transmission rate rate measuring measuring apparatus apparatus (manufactured (manufactured byby MOCON,Inc., MOCON, Inc., trade trade name: name: PERMATRAN-W3/34G) PERMATRAN-W3/34G) was used. was used. Furthermore,the Furthermore, themultilayer multilayerbody body waswas stored stored in ain a constant-temperature constant-temperature

constant-humidity chamber constant-humidity at 40C chamber at 40°C and and 90%RH forone 90%RH for oneweek, week,and andthen then the same the same measurement measurementwas wasperformed. performed.The The initialwater initial watervapor vapor transmissionrate transmission rate and andthe thewater watervapor vapor transmission transmission raterate after after storage storage at at 40Cand 40°C and90% 90%areare shown shown in Table in Table 1 to1Table to Table 4. 4.

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[0102] [Table11]

[0102] [Table Example11 Example Example22 Example Example33 Example Example44 Example Example55 Example Example66 Example Example77 Example Paper ++ Paper Paper ++ Paper Paper ++ Paper Paper ++ Paper Paper ++ Paper Paper ++ Paper Paper ++ Paper clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated clay-coated Paper substrate Paper substrate layer layer layer layer layer layer layer layer layer layer layer layer layer layer (thickness) (thickness) (50 m (50 um ++ 55 (50 m (50 um ++ 55 (45 m (45 um ++ 55 (50 m (50 um ++ 55 (50 m (50 um ++ 55 (50 m (50 um ++ 55 (50 m (50 um ++ 55 m) um) m) um) m) um) m) um) m) um) m) um) m) um) ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE CHEMIPEARL ZAIKTHENE CHEMIPEARL ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE Anchor coat layer Anchor coat layer AC AC AC S100 S100 AC AC AC (thickness) (thickness) AC AC AC AC AC AC (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Vapor-deposited layer Vapor-deposited layer Al Al Al Al Al Al Al Al Al Al Al Al Al Al (thickness) (thickness) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (50 nm) (20 nm) (20 nm) (100 (100 nm) nm) CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL Overcoat layer Overcoat layer S100 S100 S100 S100 S100 S100 S100 S100 S500 S500 S100 S100 S100 S100 (thickness) (thickness) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Pressure during vapor Pressure during vapor 0.19 0.19 0.11 0.11 0.19 0.19 0.19 0.19 0.19 0.19 0.28 0.28 0.15 0.15 deposition[Pa] deposition [Pa] Half-valuewidth Half-value width

[°][] 2.71 2.71 2.12 2.12 2.71 2.71 2.71 2.71 2.71 2.71 3.14 3.14 2.59 2.59 Anchorcoat Anchor coat 0.02 0.02 0.02 0.02 0.02 0.02 0.04 0.04 0.02 0.02 0.02 0.02 0.02 0.02 Hardness Hardness layer layer

[GPa]

[GPa] Overcoat Overcoat 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 layer layer Complex Complex Anchorcoat Anchor coat 0.54 0.54 0.54 0.54 0.54 0.54 0.64 0.64 0.54 0.54 0.54 0.54 0.54 0.54 elastic elastic layer layer

modulus modulus Overcoat Overcoat 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.50 0.50 0.64 0.64 0.64 0.64

[GPa]

[GPa] layer layer

Anchor Anchor coat coat Elongationatat Elongation 400 400 400 400 400 400 350 350 400 400 400 400 400 400 layer layer break break Overcoat Overcoat

[%]

[%] 350 350 350 350 350 350 350 350 400 400 350 350 350 350 layer layer

Initial Initial 12 12 12 12 12 12 12 12 12 12 12 12 12 12 KITvalue KIT value After folding After folding 12 12 12 12 12 12 12 12 12 12 12 12 12 12

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Water vapor Water vapor Initial Initial 1.5 1.5 1.2 1.2 1.6 1.6 1.5 1.5 1.5 1.5 3.0 3.0 0.8 0.8

transmission transmission

rate rate After storage After storage 3.2 3.2 4.5 4.5 3.5 3.5 3.0 3.0 3.2 3.2 5.8 5.8 1.5 1.5 2

[g/m /day]

[g/m2/day]

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[0103] [Table2]2]

[0103] [Table

Comparative Comparative Comparative Comparative Comparative Comparative Example Example 88 Example Example 99 Example11 Example Example22 Example Example33 Example Paper++ Paper Paper++ Paper Paper ++ Paper Paper ++ Paper Paper++ Paper Papersubstrate Paper substrate clay-coatedlayer clay-coated layer clay-coatedlayer clay-coated layer clay-coated layer clay-coated layer clay-coatedlayer clay-coated layer clay-coatedlayer clay-coated layer (thickness) (thickness) (50 m (50 5 m) um ++ 5 um) (50 m (50 5 m) um ++ 5 um) (50 m (50 um ++ 55 m) um) (50 m (50 um ++ 55 m) um) (50 m (50 5 m) um ++ 5 um) Anchorcoat Anchor coatlayer layer PVA PVA PVA PVA ZAIKTHENE AC ZAIKTHENE AC ZAIKTHENEAC ZAIKTHENE AC PVA PVA (thickness) (thickness) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Vapor-deposited layer Vapor-deposited layer Al Al Al Al Al Al Al Al Al Al (thickness) (thickness) (50nm) (50nm) (50nm) (50nm) (50nm) (50nm) (50nm) (50nm) (50nm) (50nm) Overcoatlayer Overcoat layer CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL (thickness) (thickness) S100 S100 S100 S100 S100 S100 S100 S100 S100 S100 (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Pressure during Pressure duringvapor vapordeposition deposition[Pa]

[Pa] 0.19 0.19 0.11 0.11 0.07 0.07 0.02 0.02 0.07 0.07

Half-valuewidth Half-value width [] 2.71 2.71 2.12 2.12 1.51 1.51 0.49 0.49 1.51 1.51

Hardness Hardness Anchorcoat Anchor coatlayer layer 0.19 0.19 0.19 0.19 0.02 0.02 0.02 0.02 0.19 0.19

[GPa]

[GPa] Overcoatlayer Overcoat layer 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Complex Complex elastic elastic Anchorcoat Anchor coatlayer layer 5.70 5.70 5.70 5.70 0.54 0.54 0.54 0.54 5.70 5.70 modulus modulus Overcoatlayer Overcoat layer 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64

[GPa] GPa Elongationatat Elongation Anchorcoat Anchor coatlayer layer 180 180 180 180 400 400 400 400 180 180 break break Overcoat layer Overcoat layer 350 350 350 350 350 350 350 350 350 350

[%]

[%] Initial Initial 12 12 12 12 12 12 12 12 12 12 KIT value KIT value After folding After folding 12 12 12 12 4 4 33 3 3 Water vapor Water vapor Initial Initial 1.2 1.2 1.0 1.0 1.2 1.2 1.0 1.0 0.8 0.8 transmissionrate transmission rate 2 After storage After storage 2.0 2.0 2.0 2.0 10.9 10.9 9.5 9.5 12.3 12.3

[g/m /day]

[g/m2/day]

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[0104] [Table3]3]

[0104] [Table

Example 10 Example 10 Example 11 Example 11 Example 12 Example 12 Example 13 Example 13 Example 14 Example 14 Example 15 Example 15 Example 16 Example 16 Paper substrate Paper substrate Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated (thickness) (thickness) paper 11 paper paper 22 paper paper 11 paper paper 22 paper paper 33 paper paper 22 paper paper 11 paper ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE Anchorcoat Anchor coatlayer layer ZAIKTHENE PVA5-98 PVA5-98 PVA5-98 PVA5-98 AC AC AC AC AC (thickness) (thickness) AC AC AC AC AC (4 m) (4 um) (4 m) (4 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Vapor-depositedlayer Vapor-deposited layer Al Al Al Al Al Al Al Al Al Al Al Al Al Al (thickness) (thickness) (80 nm) (80 nm) (70 nm) (70 nm) (60 nm) (60 nm) (60 nm) (60 nm) (60 nm) (60 nm) (100 nm) (100 nm) (80 nm) (80 nm) CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL Overcoatlayer Overcoat layer S100 S100 S100 S100 S100 S100 S100 S100 S100 S100 S500 S500 S500 S500 (thickness) (thickness) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Pressure during Pressure during vapor vapor 0.34 0.34 0.05 0.05 0.11 0.11 0.11 0.11 0.11 0.11 0.40 0.40 0.25 0.25 deposition [Pa] deposition [Pa]

Half-value Half-value width width [°] [] 2.50 2.50 2.40 2.40 6.20 6.20 10.70 10.70 6.00 6.00 6.20 6.20 10.70 10.70 Anchor Anchor 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.19 0.19 0.19 0.19 Hardness Hardness coat layer coat layer

[GPa]

[GPa] Overcoat Overcoat 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 layer layer Complex Complex Anchor Anchor 0.54 0.54 0.54 0.54 0.54 0.54 0.54 0.54 0.54 0.54 5.70 5.70 5.70 5.70 elastic elastic coat layer coat layer modulus modulus Overcoat Overcoat 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.50 0.50 0.50 0.50

[GPa]

[GPa] layer layer Anchor Anchor Elongation coat layer Elongation 400 400 400 400 400 400 400 400 400 400 180 180 180 180 coat layer at break at break Overcoat Overcoat

[%]

[%] 350 350 350 350 350 350 350 350 350 350 400 400 400 400 layer layer Initial Initial 12 12 12 12 12 12 12 12 12 12 12 12 12 12 KITvalue KIT value After After 8 8 11 11 12 12 12 12 12 12 12 12 12 12 folding folding Water vapor Water vapor Initial Initial 0.5 0.5 1.4 1.4 1.2 1.2 0.6 0.6 0.7 0.7 0.6 0.6 1.3 1.3

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transmission transmission After After rate rate 1.3 1.3 4.2 4.2 2.0 2.0 1.0 1.0 1.0 1.0 2.0 2.0 2.8 2.8 storage

[g/m2/day] storage

[g/m2/day]

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[0105] [Table44]

[0105] [Table Comparative Comparative Comparative Comparative Comparative Comparative Comparative Comparative Comparative Comparative Example1717 Example Example Example 44 Example55 Example Example Example 66 Example Example 77 Example Example 88 Paper substrate Paper substrate Non-coatedpaper Non-coated paper Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated Clay-coated (thickness) (thickness) 4 4 paper11 paper paper11 paper paper11 paper paper11 paper paper 2 paper 2

ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE Anchor coat layer Anchor coat layer 181062PX 181062PX ZAIKTHENE ZAIKTHENE ZAIKTHENE ZAIKTHENE PVA5-98 PVA5-98 AC AC AC AC (thickness) (thickness) (3 m) (3 um) AC AC AC AC (4 m) (4 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Vapor-deposited layer Vapor-deposited layer Al Al Al Al Al Al Al Al Al Al Al Al (thickness) (thickness) (140 nm) (140 nm) (60 nm) (60 nm) (73 (73 nm) nm) (68 nm) (68 nm) (50 (50 nm) nm) (50 nm) (50 nm) CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL CHEMIPEARL Overcoat layer Overcoat layer MC9100 MC9100 S100 S100 S100 S100 S100 S100 S100 S100 S500 S500 (thickness) (thickness) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) (3 m) (3 um) Pressure during vapor deposition [Pa] Pressure during vapor deposition [Pa] 0.15 0.15 0.03 0.03 0.02 0.02 0.03 0.03 0.05 0.05 0.05 0.05 Half-valuewidth Half-value width [°][] 14.60 14.60 1.50 1.50 1.00 1.00 1.40 1.40 1.50 1.50 1.50 1.50

Hardness Hardness Anchorcoat Anchor coat layer layer - - 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.02 0.19 0.19

[GPa]

[GPa] Overcoatlayer Overcoat layer - - 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 0.04 Complexelastic Complex elastic Anchor Anchorcoat coat layer layer - - 0.54 0.54 0.54 0.54 0.54 0.54 0.54 0.54 5.70 5.70 modulus modulus Overcoat layer Overcoat layer - 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.64 0.50 0.50

[GPa]

[GPa] -

Elongationatat Elongation Anchorcoat Anchor coat layer layer - - 400 400 400 400 400 400 400 400 180 180 break break Overcoatlayer Overcoat layer - 350 350 350 350 350 350 350 350 400 400

[%] [%] -

Initial Initial 12 12 12 12 12 12 12 12 12 12 12 12 KITvalue KIT value After folding After folding 12 12 5 5 4 4 5 5 3 3 4 4 Water vapor Water vapor Initial Initial 1.1 1.1 1.5 1.5 1.4 1.4 3.0 3.0 1.0 1.0 0.9 0.9

transmissionrate transmission rate 2 After storage After storage 1.5 1.5 8.6 8.6 9.7 9.7 19.2 19.2 8.1 8.1 9.9 9.9

[g/m /day]

[g/m2/day]

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[0106] As shown

[0106] As shownininTable Table1 1totoTable Table4,4,the themultilayer multilayer bodies bodies of of the the Exampleshadhad Examples satisfactorydegrees satisfactory degrees of of oilresistance oil resistance(KIT (KIT value) value) not not only only

initially but initially but also also after after folding. Furthermore, folding. Furthermore, as as shown shown in Table in Table 1 to 1 to Table 4,4, itit was Table wasconfirmed confirmed that that thethe multilayer multilayer bodies bodies of Examples of the the Examples

maintaineda awater maintained watervapor vapor transmission transmission raterate 6 g/m2/day of 6ofg/m2/day or after or less less after being stored being stored at at 40C and 90%RH 40°C and 90%RHfor for one one week, week, demonstrating demonstrating

satisfactory water vapor barrier properties. satisfactory water vapor barrier properties.

Reference Signs List Reference Signs List

[0107]

[0107] 1: 1: paper substrate, 2:2: anchor paper substrate, coat layer, anchor coat layer, 3: aluminum 3: aluminum

vapor-depositedlayer, vapor-deposited layer,4:4: overcoat overcoatlayer, layer, 10: 10: multilayer multilayerbody, body,20: 20:gusset gusset bag, B1, bag, B1, B2: B2:folded foldedpart. part.

46

Claims (10)

1. 2023363440 14 Mar CLAIMS CLAIMS

   [Claim 1] A multilayer body comprising a structure in which at least a paper substrate, an anchor coat layer, an aluminum vapor-deposited layer, and an overcoat layer are laminated in this order, wherein in the aluminum vapor-deposited layer, a half-value 2023363440

   5 width of a peak of crystal plane of aluminum in X-ray diffraction measurement measurement is is 1.6orormore 1.6° moreandand 15.0 15.0° or or less. less.
2. [Claim 2] The multilayer body according to claim 1, wherein the anchor coat layer contains a polyolefin having a polar group or a 10 polyvinyl alcohol-based resin.
3. [Claim 3] The multilayer body according to claim 1, wherein the overcoat layer contains a polyolefin having a polar group.
4. [Claim 4] The multilayer body according to claim 1, wherein a hardness of the anchor coat layer as measured by a nanoindentation 15 15 method at a cross-section in a thickness direction of the multilayer body is is 0.3 0.3 GPa GPa oror less. less.
5. [Claim 5] The multilayer body according to claim 1, wherein a hardness of the overcoat layer as measured by a nanoindentation method at a cross-section in a thickness direction of the multilayer body is 0.3 20 20 GPa orless. GPa or less.
6. [Claim 6] The multilayer body according to claim 1, wherein the aluminum vapor-deposited layer has a thickness of 20 nm or more and 100 nmororless. 100 nm less.
7. [Claim 7] The multilayer body according to claim 1, wherein in the 25 aluminum vapor-deposited layer, a half-value width of a peak of crystal plane of aluminum in X-ray diffraction measurement is 2.0 or more

   and 15.0ororless. and 15.0° less.
8. [Claim 8] The multilayer body according to claim 7, wherein the aluminum vapor-deposited layer is in contact with a resin layer containing an ionomer or a polyvinyl alcohol-based resin having a degree of saponification of 95% or more. 2023363440

   5
9. [Claim 9] A packaging bag comprising the multilayer body according to any one of claims 1 to 8.
10. [Claim 10] The packaging bag according to claim 9, having a folded part.

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    Fig.1

    10

    4 3 2