JP2907935B2 - Metallized plastic film - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal-deposited plastic film, and more particularly, to a metal-deposited film based on a plastic film mainly composed of a polypropylene resin. The present invention relates to a metal-deposited plastic film which not only has high adhesive strength to a film and excellent printability on a vapor-deposited surface and adhesiveness to other films, but also has good slipping properties and blocking resistance.

[Conventional technology]

In recent years, metal-deposited plastic films, in which a metal is deposited on a plastic film under a vacuum, have been used for foods from existing materials such as gold and silver threads, building materials, etc. due to their excellent decorative properties, gas barrier properties, and light blocking properties. Applications have been expanded to a wide range of packaging materials, mainly for marine products. In particular, aluminum vapor-deposited plastic films are widely used mainly for packaging materials, but in the case of packaging materials, most cases use printing or lamination with other films on the vapor-deposited surface (aluminum surface). is there.

By the way, a polypropylene-based film (here, a polypropylene-based film includes not only a propylene homopolymer but also a copolymer of propylene as a main component and ethylene or another α-olefin). ) Is a major plastic film, and metal-deposited polypropylene films having a polypropylene film as a base film have been used in a large amount in the above-mentioned applications. However, the metal-deposited polypropylene film has low adhesion strength between the base film and the vapor-deposited film, that is, the vapor-deposition strength, and when the vapor-deposited metal is aluminum, the printability of the vapor-deposited surface and the adhesiveness with other films (hereinafter referred to as printing / printing). This is extremely low, and cannot be used for applications requiring printing, lamination, and the like, which has been a major obstacle in developing applications.

The low vapor deposition strength is due to the inherent inertness of the polypropylene resin, and the low printing and laminating properties of the vapor deposition surface are due to the neutralizing agent, slip agent, oxidation, etc. added to the polypropylene resin. Inhibitors and the like migrate to the surface, and ooze through the vapor deposition layer on the vapor deposition surface side, and are transferred to the vapor deposition surface when they are wound on the opposite surface side. No. 49574 and JP 5
9-25829). The reason for the latter is further explained. Among the additives, fatty acid derivatives used as neutralizing agents, particularly higher fatty acid salts such as calcium stearate and sodium stearate, oleic acid amide, stearic acid amide,
The content of higher fatty acid amides such as erucamide is
Even in the case of a very small amount of about 0.01% by weight, the wetting index of the vapor deposition surface (aluminum surface) is reduced to 33 dyn / cm or less, so that printing on the vapor deposition surface and lamination adhesion become impossible.

Conventionally, various proposals have been made to solve such a problem. For example, as a method for increasing the vapor deposition strength, a method of physically or chemically roughening the film surface, a method of oxidizing the film surface by corona discharge, gas flame, irradiation of radiation, or the like, or a method of providing a polar group, or There is known a method of coating a film surface with an adhesive material. However, any of the methods for roughening or oxidizing the film surface alone has insufficient vapor deposition strength,
In addition, the method of coating the adhesive material requires a physical or chemical pretreatment of the film surface prior to the coating, which complicates the process, and has the disadvantage that the cost of the vapor deposition film increases. In addition, as a method for improving the printing strength and lamination properties of the deposition surface together with the deposition strength,
It is also known to use, as a base film, a film obtained from a mixed polymer obtained by blending polypropylene with a grafted polypropylene obtained by graft polymerization of maleic anhydride or the like onto polypropylene (Japanese Patent Application Laid-Open No. 50-61469, Japanese Patent Publication No. 58-58).
-49574). However, in this case as well, the cost of the film is high, and the unreacted maleic acid remaining in the film and the decomposed product generated by thermal decomposition have a strong odor. Then there was a disadvantage.

Further, the present inventors have previously proposed a polyolefin-based resin composition for metallized films, comprising a specific propylene-α-olefin copolymer and a high-density polyethylene (JP-A-59-25829). ), But a film-based metal (aluminum) obtained from this composition
The vapor-deposited film has a problem that, depending on the amount of polyethylene added, the film is apt to be torn and the laminate bag for packaging a heavy material is easily broken at the heat seal portion.

[Problems to be solved by the invention]

The present invention solves the above-mentioned drawbacks of the prior art and, while being a metal-deposited film based on a plastic film mainly composed of a polypropylene-based resin, has a high adhesive strength of a deposited film, and has high printing and laminating properties on the deposited surface. It is an object of the present invention to provide not only excellent properties but also good slipping properties and blocking resistance.

[Means for solving the problem]

As a result of various studies by the present inventors, the adhesive strength of a vapor-deposited film was reduced by using a plastic film obtained from a composition in which a specific ethylene-alkyl acrylate copolymer was mixed with a polypropylene resin as a base film. Although high printing and laminating properties were obtained, the following examination revealed that this product had insufficient slipping and blocking resistance, and was further developed to facilitate the process of processing for various uses. It turned out to need improvement. Therefore, as a result of further study, a plastic film obtained from a composition obtained by mixing a specific polyethylene resin in addition to the above two materials was used as a base film.
The present invention has been completed by finding that the above-mentioned problems can be solved.

 Hereinafter, the present invention will be described in detail.

The present invention relates to 100 parts by weight of a polypropylene resin and ethylene-methyl acrylate copolymer or / and ethylene-
This is a metal-deposited plastic film obtained by depositing a metal on a plastic film obtained from a composition mainly comprising 1 to 20 parts by weight of an ethyl acrylate copolymer and 1 to 10 parts by weight of a polyethylene resin having a density of 0.93 or more. The vapor-deposited film is usually formed on only one side, but may be formed on both sides depending on the application. Furthermore, the present invention also includes a metal-deposited plastic film having a configuration in which a plurality of single-layer films are laminated with the above-mentioned metal-deposited plastic film as the outermost layer with its vapor deposition surface outside.

The polypropylene resin used in the present invention is a crystalline propylene homopolymer, a crystalline copolymer of propylene containing propylene as a main component and ethylene or another α-olefin, or a mixture thereof. The above-mentioned homopolymer and copolymer can be obtained, for example, by polymerizing the respective monomers in the presence of a Ziegler-Natta type catalyst. Of these, 80-98% by weight of propylene component
Crystalline ethylene-propylene copolymer, crystalline propylene-butene-1 copolymer, crystalline ethylene-propylene-containing crystalline melting point (Tm) in the range of 115 to 150 ° C.
Butene-1 terpolymer (in this case ethylene: butene-
1 is preferably 10: 1 to 1:15), or a mixture thereof is a film obtained from a composition obtained by mixing these with an ethylene-alkyl acrylate copolymer and a polyethylene resin, It is particularly desirable because it has excellent adhesiveness to the deposited film, slipping property and blocking resistance, as well as excellent impact resistance and heat sealing properties.

Here, the crystal melting point (Tm) is the peak of an endothermic curve accompanying the melting of a crystal obtained by heating a 10 mg sample at a rate of 10 ° C./min in a nitrogen atmosphere using a scanning differential calorimeter. Say temperature. In the case of a crystalline copolymer containing propylene as a main component, Tm decreases as the content of ethylene or α-olefin as a comonomer component increases. For example, in the case of a crystalline ethylene-propylene random copolymer, the temperature slightly varies depending on the randomness of the copolymer, but when the ethylene content exceeds approximately 2.5% by weight, the temperature falls to 150 ° C. or lower.
A polymer having a plurality of Tm's can be obtained by carrying out copolymerization in two or more stages by changing polymerization conditions. In this case, a polymer having a main peak of 150 ° C. or lower is desirable.

The ethylene-methyl acrylate copolymer or ethylene-ethyl acrylate copolymer used in the present invention is obtained by autoclaving an ethylene monomer and a monomer of methyl acrylate or ethyl acrylate (sometimes collectively referred to as alkyl acrylate). It is obtained by copolymerizing a catalyst and a reaction initiator by a method. In the same manner as described above, copolymers of ethylene and other monomers such as vinyl acetate, acrylic acid, methacrylic acid, methyl methacrylate and the like can be obtained, but these have little effect when used in the present invention. The content of the alkyl acrylate component in the ethylene-acrylic acrylic copolymer is usually 0.5 to 40% by weight, preferably 3 to 3%.
0% by weight, more preferably 10 to 25% by weight). When the content of the alkyl acrylate component is less than 0.5% by weight,
The effect of improving the vapor deposition strength and the printing / laminating properties of the vapor deposition surface cannot be obtained. As the content of the alkyl acrylate component is increased to 0.5% by weight or more, the melting point of the ethylene-alkyl acrylate copolymer is lowered. The shock resistance is improved, and heat sealing can be performed at a low temperature.
However, when the content of the alkyl acrylate component exceeds 40% by weight, the ethylene-alkyl acrylate copolymer does not show crystallinity, the compatibility with the polypropylene resin is deteriorated, and the transparency and surface of the obtained film are reduced. The smoothness is impaired.

The polyethylene resin used in the present invention is a homopolymer of ethylene or a copolymer with propylene, butene-1, hexene-1, etc. containing 95% by weight or more of an ethylene component and having a density of 0.93 or more. is there.

The melt flow rate of each of the polypropylene resin, the ethylene-alkyl acrylate copolymer, and the polyethylene resin is not particularly limited as long as the compatibility of the three is not impaired. Many experiments by the present inventors have shown that the melt flow rate (MFR) of polypropylene-based resin
When the ratio of the melt flow rate of the ethylene-alkyl acrylate polymer (symbol MI-OR) is in the range of 0.2 <MI-OR / MFR-PP <4.0 (symbol: PP) It has been found to be particularly preferable in terms of improving the compatibility between the two. When the melt flow rate ratio was in the above range, it was also found that when the polyethylene resin was added to both, the compatibility of the three was similarly improved. When MI-OR / MFR-PP is 0.2 or less, the compatibility of the three is reduced, and the film is streaked,
In extreme cases, film cracking occurs. On the other hand, if the ratio is 4.0 or more, a difference occurs in the flowability between the polypropylene resin and the ethylene-alkyl acrylate copolymer, so that the composition cannot be uniformly melt-extruded as a whole and the resin film has uneven thickness along the flow direction. (Surging phenomenon) occurs, and even when the obtained film is deposited, thickening and wrinkles are likely to occur.

In addition, in order to obtain a vapor-deposited film having particularly excellent metallic luster, a polypropylene resin and a polyethylene resin (the melt flow rate is referred to as MI-PE) are mixed with 0.5 ≦ MI-PE / MFR-PP (2 It is desirable to select and use such that

In the composition of the composition of the present invention, the reason why the ethylene-alkyl acrylate copolymer is limited to 1 to 20 parts by weight with respect to 100 parts by weight of the polypropylene resin, when less than 1 part by weight, the vapor deposition strength and printing of the vapor deposition surface. If the lamination property is not improved, and if it exceeds 20 parts by weight, the film surface becomes rough and a film having a beautiful metallic luster cannot be obtained, and a peculiar odor is generated on the film, and This is because mixing with the odor and lowering the commercial value is not preferable.

The reason for limiting the blending amount of the polyethylene resin to 1 to 10 parts by weight based on 100 parts by weight of the polypropylene resin is that if the amount is less than 1 part by weight, the slipping property and blocking resistance of the film are reduced, and the winding of the vapor-deposited film is reduced. It is not preferable because the appearance is inferior and partial peeling of the vapor deposition surface is apt to occur, and if it exceeds 10 parts by weight, it tends to tear vertically, it is easy to tear in the vapor deposition process, the shrinkage of the film in the vapor deposition process increases, and the vapor deposition strength decreases. This is because whitening of the deposition surface occurs, which is not preferable.

The composition used in the present invention may optionally contain an antioxidant, an inorganic filler, a lubricant, an antiblocking agent and the like as long as the object of the present invention is not impaired. It is desirable not to use fatty acids and derivatives containing fatty acid-forming groups, etc., in order not to lower the adhesive strength of the film and the printing and laminating properties of the deposited surface.

As the antioxidant, phosphorus-based and phenol-based ones having a molecular weight of 500 or more are particularly desirable. Specifically, tetrakis [methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] methane, 1,3,5-trimethyl-2,4,6, -tris (3,5-di-t-butyl-4-hydroxybenzyl) benzene, 1,3,5-tris (4-t-butyl-3-hydroxy-2,6
-Dimethylbenzyl) isocyanurate, 6- (4-hydroxy-3,5-di-t-butylamino)
-2,4-bis-n-octylthio-1,3,5-triazine, 1,1,3-tris (2-methyl-4-hydroxy-5-t
-Butylphenyl) butane, tris (3,5-di-t-butyl-4-hydroxyphenyl) isocyanurate, tetrakis (2,4-di-t-butylphenyl) 4,4'-biphenylene-diphosphonite, etc. And these may be used alone or in combination of two or more. The content is suitably from 0.03 to 0.3 parts by weight based on 100 parts by weight of the polypropylene resin. The inclusion of the above antioxidant is extremely effective for the stability of the composition during film forming and film use.

As inorganic fillers, calcium carbonate, silica,
Any of clay, talc, hydrotalcite, zeolites and the like can be used.

As a method for adding the above-mentioned additives to the polypropylene resin or the like, any method may be used as long as it is uniformly dispersed. However, the additives are mixed by a ribbon blender, a Hensiel mixer (trade name) or the like, and the mixture is extruded. It is desirable to use a method of melt-kneading with the method described above.

The polypropylene film used in the present invention can be obtained from the above composition by a usual T-die method or an inflation method. Not only these uniaxially or biaxially stretched films but also unstretched films can be used as base films. Further, in the present invention, in addition to the single-layer plastic film as described above, a composite film in which a plurality of films are laminated using the plastic film as a surface layer on one side or both sides can be used as a base film. In this case, it is a matter of course that the metal deposition film is formed on the plastic film, that is, on the plastic film obtained from the composition forming the surface layer. When the metal-deposited plastic film thus obtained is expressed on the basis of the single-layer metal-deposited plastic film as a reference, a plurality of single-layer films are laminated as the outermost layer with its vapor-deposited surface outside. ing.

Hereinafter, metal deposition on the base film will be described for the case of a single-layer film, but the same applies to the case of a composite film.

The plastic film obtained from the composition can be directly subjected to metal deposition, but the wettability of the film surface is improved by surface treatment such as corona discharge treatment or flame treatment in air or under a special gas atmosphere such as nitrogen or oxygen. You may use it after improving and further improving adhesiveness. Long plastic film (normally rolled)
A generally known vacuum deposition method for depositing a metal on a substrate is as follows. Reduce the degree of vacuum in a vacuum evaporation apparatus provided with a roll-up film feeding section, a deposition section, and a winding section to 10 ^-4 Torr or less. In this apparatus, a desired metal such as aluminum is placed in a container or in a filament form. The metal is heated to dissolve and evaporate the metal, and the vapor-deposited molecules are continuously vapor-deposited on the surface of the fed film and wound up. The method of using such a vacuum evaporation apparatus is a batch type, and it is necessary to improve productivity. Therefore, recently, one film roll has a width of 2 m or more and a length of 1 m.
It is wide and long, such as 10,000 to 20,000 m, so that the requirements for the high-speed deposition property and roll form of the raw film for vapor deposition are becoming more severe.

There are various evaporation methods other than the vacuum evaporation method described above.
For example, sputtering sputtering and ion plating utilizing a phenomenon in which a metal constituting a cathode scatters when discharged in a vacuum are described. Aluminum is the most commonly used metal to be deposited, but gold, silver, copper, nickel, chromium, germanium, selenium, titanium, tin,
Zinc and the like. The thickness of the metal deposition layer is usually 50-800
This is in the range of Angstroms, and it is possible to perform partial evaporation as well as the entire surface, one surface. In addition, the vapor deposition surface can be top-coated for coloring and protection.

〔Example〕

Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited thereto. The methods for measuring physical properties and the evaluation criteria shown in the examples and comparative examples are as follows.

(1) Melt flow rate: Based on JIS K 7210-1976, the melt flow rate (MFR-PP) of a polypropylene resin was determined under test conditions 14 (230 ° C,
2.16 kgf), the melt flow rate (MI-OR) of the ethylene-alkyl acrylate copolymer and the polyethylene resin (MI-PE) are based on test condition 4 (190 ° C, 2.16 kgf).

 (Unit: g / 10 minutes).

(2) Adhesive strength of vapor-deposited film (vapor-deposited strength): A Surlyn film (Ionomer manufactured by Tamapoly) is layered on the vapor-deposited film side of the vapor-deposited film, with a sealing temperature of 120 ° C., a pressure of 2.0 kg / cm ² , and a sealing time of 1.0 second. 10mm x 15mm
And a 90 ° peel strength was measured with a tensile tester.

 (Unit: g / 15mm).

(3) resistance to a blocking resistance: 2cm (width) × 7 cm 2 at 40 ° C. with a load of 250 g / cm ² overlapped and non-deposition surface and the deposition surface over the length 2cm of deposition film of the (long)
After standing for 4 hours, the force (blocking force) required for shearing and peeling at a rate of 300 mm / min using a tensile tester was shown. The smaller this force is, the better the blocking resistance is. (Unit: kg / 4cm ² ).

(4) Slip property (sliding friction coefficient): Slip property was shown by the static friction number measured by the method specified in ASTM D1894-63.

(5) Wetting index: The wetting index was measured by the method of JIS K 6758.

 (Unit: dyn / cm).

(6) Printing and laminating properties of the vapor-deposited surface: The vapor-deposited surface (metal surface) of the film on which metal (aluminum) is vapor-deposited on one side and the non-deposited surface (the surface of the base film) are superimposed, and a load of 4.2 kg / 100 cm ² is applied. After being left for 72 hours in an atmosphere at a temperature of 40 ° C. and a relative humidity of 95%, the wetting index of the deposition surface is measured. In order to be evaluated as having good printing and laminating properties, the wetting index needs to be 35 or more, and desirably 37 or more, and the printing and laminating properties of the vapor-deposited surface are ranked from the wetting index as follows.

(7) Roll of vapor-deposited film: A film roll obtained by continuously winding a fixed-length vapor-deposited film was visually observed and evaluated according to the following criteria.

：: The surface is flat, has no wrinkles or thickening (rolling bumps), and has no local distortion or habit when the film is pulled out (rolling appearance is good).

X: Wrinkles or thickening, wrinkles are left on the film when the film is pulled out, or the film is distorted or hazy (poor winding).

(8) Odor: 10 g of the film was sealed in an odor bottle (500 ml), and the odor generated after heating at 80 ° C. for 2 hours was determined in the following three stages by a sensory test.

(Average of 10 panelists) Examples 1 to 3 and Comparative Examples 1 to 6 A crystalline ethylene-propylene-butene-1 terpolymer containing 2.5% by weight of an ethylene component and 4.5% by weight of a butene-1 component and having a melt flow rate (MFR- PP) is 6.0, Tm
Is 0.10 parts by weight of tetrakis- [methylene-3- (3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] methane as an antioxidant in 100 parts by weight of a polypropylene resin at 140 ° C. And silica-based inorganic filler to 0.
10 parts by weight were added and pelletized using an extruder. With respect to 100 parts by weight of the additive-containing pellet-like polypropylene resin, various ethylene-methyl acrylate copolymers or ethylene-acrylic acid having an alkyl acrylate content and a melt flow rate (MI-OR) shown in Table 1 were used. Ethyl copolymer and various polyethylene resins having the density and melt flow rate (MI-PE) shown in Table 1 were blended in parts by weight shown in Table 1 and dry blended with a blender.
The resulting composition was pressed at a melting temperature of 220 ° C. using an extruder having a diameter of 65 mmφ and a T-die, rapidly cooled with an air chamber and a cooling roll having a surface temperature of 30 ° C. to form a film, and immediately wetted on one side of the film. Take up while applying corona discharge treatment so that the index becomes 40 dyn / cm, thickness 25μm, width
A 60 cm roll-shaped plastic film treated on one side was used. After cutting this plastic film to a width of 50 cm using a slitter, it is set as a base film in a continuous vacuum vapor deposition apparatus, and while the film is continuously fed, a 5 × 10 ^-5 Torr vacuum is applied to the corona-treated surface of the film. Aluminum is vapor-deposited and rolled up, and the thickness of the vapor-deposited film is about 500 angstroms (within ± 15 angstroms)
A single-sided aluminum-deposited plastic film of length 2,
Obtained in rolls of 000 m. Table 2 shows the characteristics of the metal-deposited films obtained in the examples and the comparative examples.

From Tables 1 and 2, it can be seen that a film obtained from a composition defined in the present invention, that is, a composition obtained by blending a specific ethylene-alkyl acrylate copolymer and a specific polyethylene resin with a polypropylene resin is used as a base. While the vapor deposition film of each example is excellent in all characteristics, the vapor deposition film of each comparative example has some characteristics that are substantially inferior even if some characteristics are similar to those of the example. It turns out that there is.

Example 4, Comparative Example 7 A crystalline ethylene-propylene binary copolymer having an ethylene component of 4.0% by weight and a melt flow rate (MFR-P
1,3,5-Tris (4-t-butyl-3-hydroxy-2,6-dimethylbenzyl) isocyanurate as an antioxidant was added to 100 parts by weight of a polypropylene resin having a P) of 7.0 and a Tm of 140 ° C. 0.10 parts by weight of a silica-based inorganic filler and 0.10 parts by weight of a silica-based inorganic filler were added, and pelletized using an extruder. Melt flow rate (MI-PE) at a density of 0.950 g / cm ³ with respect to 100 parts by weight of this additive-containing pellet-like polypropylene resin
Is a polyethylene resin (phenolic antioxidant)
0.1% by weight) and 10 parts by weight of the ethylene-methyl acrylate copolymer used in Example 1 (Example 4) or the melt flow rate at a vinyl acetate component content of 18% by weight. (Based on the same measurement method as MI-PE) is 2.0
Ethylene-vinyl acetate copolymer (phosphorus antioxidant 0.
10% by weight (containing 1% by weight) (Comparative Example 7) was blended by dry blending with a blender, and the obtained composition was melted at 230 ° C. using an extruder having a diameter of 90 mmφ and a T-die.
The film is rapidly cooled by an air chamber and a cooling roll having a surface temperature of 30 ° C. to form a film, which is immediately wound on one side of the film while being subjected to a corona discharge treatment so that the wetting index becomes 40 dyn / cm. , A plastic film with a width of 2 m and a single-sided finish. After cutting this plastic film to a width of 190 cm using a slitter, it was set as a base film in a continuous vacuum evaporation apparatus, and the film was continuously unwound while a 5 × 10 ^-5 Torr vacuum was applied to the corona-treated surface of the film. Then, aluminum was vapor-deposited and wound, and a single-sided aluminum vapor-deposited plastic film having a thickness of about 350 angstroms (within ± 15 angstroms) and a length of 2,000 m was obtained in a roll form.

The aluminum vapor-deposited film obtained in Example 4 was excellent in all the properties as in Examples 1 to 3, whereas the plastic film before vapor deposition obtained in Comparative Example 7 produced countless "fish eyes". Therefore, the deposited film also had a defect (pinhole) in the deposited film due to the fish eye, and was not practical.

Example 5 In Example 1, a polypropylene homopolymer (MFR-PP10, Tm163) was used instead of the crystalline ethylene-propylene-butyne-1 terpolymer as the polypropylene resin.
C.) was used in the same manner as in Example 1 to obtain a plastic film and a rolled single-sided aluminum-deposited plastic film using the slit film as a base film.

Example 6 In Example 3, a composite film obtained by laminating a plastic film (thickness was changed to 20 μm) obtained from the composition and a film (thickness 15 μm) obtained from low-density polyethylene was used. A rolled single-sided aluminum-deposited plastic film was obtained in the same manner as in Example 3, except that the film was deposited on the former film-side surface.

 Table 3 shows the characteristics of Examples 4 to 6.

From Table 3, it can be seen that the effects of the present invention are exhibited not only when the propylene-based resin as the main raw material of the present invention is a terpolymer but also a terpolymer and a homopolymer. Further, it can be seen that even when a composite film is used as the film, the film has excellent characteristics.

〔The invention's effect〕

The metallized plastic film according to the present invention uses a specific ethylene-methyl acrylate or / and / or ethylene-ethyl acrylate and a specific polyethylene while using a plastic film mainly composed of a polypropylene resin as a base film. By blending a specific amount with the base resin, it excels not only in the adhesive strength between the base film and the deposited film, but also in the printing and laminating properties of the deposited surface, as well as in the slipping and blocking resistance, and in packaging, decoration, etc. Can be used more widely and in large quantities.

Claims (4)

(57) [Claims] 1. 100 parts by weight of a polypropylene resin and ethylene-methyl acrylate copolymer and / or ethylene
A metal-deposited plastic film obtained by depositing metal on a plastic film obtained from a composition mainly comprising 1 to 20 parts by weight of an ethyl acrylate copolymer and 1 to 10 parts by weight of a polyethylene resin having a density of 0.93 or more. 2. The ratio of the melt flow rate of a polypropylene resin (MFR-PP) to the melt flow rate of an ethylene-alkyl acrylate copolymer (MI-OR) is 0.2 <MI-OR / MFR-PP <4.0. 2. The metal-deposited plastic film according to claim 1, wherein a polypropylene resin and ethylene-alkyl acrylate copolymer are used. 3. A polypropylene resin having a ratio of a melt flow rate (MFR-PP) of a polypropylene resin to a melt flow rate (MI-PE) of a polyethylene resin satisfying 0.5 ≦ MI-PE / MFR-PP. 3. The metal-deposited plastic film according to claim 1, wherein a polyethylene resin is used. 4. A metal-deposited plastic film having a structure in which a plurality of single-layer films are laminated with the metal-deposited plastic film according to any one of claims 1 to 3 as an outermost layer with its deposition surface on the outside.