JP3301832B2 - Heat-sealing lid material based on thin paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-sealing lid material and a packaging container using the same. More specifically, blister packaging, especially PTP packaging for pharmaceuticals (Press Through)
The present invention relates to a heat-sealing lid material based on thin paper such as glassine paper and a packaging container using the same.

[0002]

2. Description of the Related Art In general, pharmaceuticals such as various capsules and tablets,
Blister packaging such as PTP packaging is widely used as a method for hygienic packaging of solid foods such as lump chocolate or candy or miscellaneous goods such as toothbrushes. In these blister packages, the package is stored in a pocket portion of a container made of a thermoplastic resin sheet such as polyvinyl chloride or polypropylene in which a pocket for storing the package is formed. On the opening side, a lid material based on metal foil such as aluminum foil,
It is performed by bonding and sealing through a heat sealing layer.

[0003] However, when metal foil is used as the lid material, there is a drawback that when stored under high humidity, rust may be generated and the price is high. In addition, when a substance to be packaged contains a substance that may generate an acid having a vapor pressure, corrosion of a metal foil such as an aluminum foil is a serious problem.

In order to improve these drawbacks, various materials other than metal foil have been studied as a base material. As a result, thin paper such as glassine paper has been used as a cover material for blister packaging, especially for PTP packaging, because of its strength and bursting property. Physical properties were found to be suitable. As such a heat-sealing lid material, for example, glassine paper or the like is used as a base material, a sealing agent is applied on one surface thereof, and a sealing layer is provided thereon. Apply an adhesion promoter to improve interlayer adhesion between layers, provide an intermediate layer, apply a heat sealing agent on top of it, and provide a heat sealing layer, Coated thin paper coated with a water-soluble topcoat has been used (for example, see Japanese Patent Application Laid-Open No. 54-21474).

[0005] The heat-sealing lid made of the above-mentioned coated thin paper is often colored for the purpose of identifying the contents of the blister package or for beautifying, and colored glassine paper or the like is used as a base material. In some cases, however, it is difficult to meet a wide variety of coloring requirements. As a countermeasure, coloring the sealing layer using a colored sealing agent is performed (Packaging Technology Vol. 29, No. 2, 217-220).
page).

A typical process for producing such a heat-sealing lid material is to first apply a vinyl chloride-based copolymer to one surface of a glassine paper having a basis weight of about 20 to 40 g / m ² (the surface on the heat-sealing side). Ordinary printing inks and coatings such as coalesces, polyvinyl butyral resins, (meth) acrylate copolymers, ethylene-vinyl acetate copolymers, nitrocellulose resins, polyester resins, hard resin resins, etc. A coloring agent such as a pigment or a dye is added to and dispersed in a vehicle containing one or more of thermoplastic resins used as a main component, and a coating agent obtained by dispersing the coating agent in a roll coating machine, a gravure printing machine, or the like. Coating is performed by an appropriate coating means and dried to form a sealing layer for the purpose of sealing and coloring glassine paper. After printing letters, symbols, decorative designs, etc., as necessary, it is also used to seal the printed surface, and to strengthen the adhesion between the sealing layer and the uppermost heat-sealable layer. Coating a coating agent mainly composed of a vinyl chloride copolymer or the like,
Dry to form an intermediate layer. Next, a coating material containing a polyvinylidene chloride copolymer as a main component is applied, dried, and a heat-sealing layer having moisture-permeability-preventing properties is formed, thereby producing a lid material. After printing on the other surface (the surface that appears on the outside), a heat-resistant overcoat layer is optionally provided. Such heat-sealing lid materials are also used for blister packaging other than PTP packaging and other packaging containers in which a sheet that is easily broken or peeled at the opening of the container is heat-sealed.

[0007]

In the blister package, after the contents to be filled are stored in a pocket of a container made of a synthetic resin sheet, a lid member is placed on the opening side thereof so that the heat sealing layer faces the lid member. Then, heat and pressure are applied to the non-pocket portion (flange portion) of the plastic container by applying heat and pressure from a surface opposite to the surface provided with the heat sealing layer of the lid material by a heat sealing bar or a heat sealing drum. The conditions at the time of heat sealing vary depending on the material and processing speed of the container, etc.
When the container is made of polyvinyl chloride sheet, the temperature is 80 ~
A temperature of about 180 ° C. is appropriate, and generally the temperature is usually between 120 and 160 ° C., and the heat sealing pressure is often set to ¹ to 3 kg / cm ² .

However, at the time of heat sealing, heat is applied to the heat sealing layer of the lid material by the heat of the heat sealing bar or the heat sealing drum, and adhesion is performed. With the flow of the heat sealing layer, the intermediate layer and the sealing layer are bonded. Fluidity also occurs, and the thickness and thickness of the resin layer consisting of the heat sealing layer, the intermediate layer and the sealing layer are partially reduced due to uneven pressure and slight deviation of the heat sealing pressure, and the resin flow pattern such as stain on the appearance Then, there is a problem that poor adhesion may occur in a portion where the resin layer is almost completely removed locally.

Particularly, in many cases, since the colored layer is provided as described above, unevenness of the hue called a color flow is generated, not only to significantly reduce the commercial value of the contents but also to print characters printed between the layers. In some cases, the printed film of the symbol or the symbol flows at the same time, so that the contents cannot be identified.

In general, a pressing surface of a heat sealing bar or a heat sealing drum is regularly and three-dimensionally finely arranged like an engraved intaglio in a printing plate, as a countermeasure in a process for providing a uniform heat sealing effect. Although the method called so-called silk seal, which uses a processed material, can be solved to a certain degree in terms of the heat sealing strength, the appearance of the resin layer flows, particularly the flow of the sealing layer, that is, the resin flow pattern. Occurrence and color flow are not resolved.

[0011]

As a result of extensive studies, the present inventors have found that one side of a tissue paper is coated with a specific filler layer and a heat-sealing layer, and preferably an intermediate layer is provided between the two layers. By using a specific resin and a resin composition for the resin and the resin composition used for each of these layers, it is possible to obtain a lid material that does not generate a resin flow pattern or a color flow when thermally sealed in a container body. And found the present invention.

That is, the heat-sealing lid material of the present invention comprises a base material made of thin paper, a sealing layer mainly composed of urethane resin provided on one side of the base material, and a heat-sealing layer provided thereon. It is composed of It is preferable to interpose an intermediate layer between the sealing layer and the heat-sealable layer to enhance the interlayer adhesion between the two. Further, when the container body to be heat-sealed is made of a thermoplastic resin containing vinyl chloride resin as a main component, a sealing layer containing a urethane resin as a main component and an acid-modified vinyl chloride-based copolymer are provided on one side of thin paper such as glassine paper. It is preferable to provide an intermediate layer mainly composed of the union and a heat sealing layer mainly composed of the vinylidene chloride copolymer in this order.

As the thin paper as the base material used in the present invention, packaging paper such as bleached kraft paper or pure white roll paper can be used. However, when used as a lid material, glass paper, rice paper, etc. , India paper, carbon paper base paper, type copy paper, condenser paper and other high density thin papers are preferred. The grammage is not particularly limited, but if it is too thin, it is easily damaged in the process of manufacturing the lid material such as coating and printing, and the one processed into the lid material also has low strength. On the contrary, it becomes brittle and easily broken, while when it is thick, the strength increases,
Since the reinforcing effect is added by coating the resin layer, P
When processed into TP packaging, the lid is not easily broken even if the bottom of the container is pressed with a finger, making it difficult to remove the contents.
Those having 0 to 40 g / m ² are preferred.

Examples of the urethane resin used in the filling layer in the present invention include known polyols having a hydroxyl group or other active hydrogen-containing polyfunctional compounds or polymers having an amino group or a carboxyl group in the side chain or terminal. A two-pack type polyurethane mainly containing a compound and a polyisocyanate compound is used, and a urethane resin mainly containing a polyol and a polyisocyanate is particularly preferable.
Examples of polyols include polyester, poly (oxypropylene), poly (oxyethylene-oxypropylene), and hydroxyl group-containing monomers such as hydroxyethyl (meth) acrylate and hydroxypropyl (meth) acrylate as functional monomers. Examples thereof include an acrylic polyol which is a copolymerized acrylic copolymer and a hydroxyl group-containing copolymer in which a hydroxyl group is generated by partially hydrolyzing a vinyl acetate group of a copolymer containing vinyl acetate. As the polyisocyanate compound, all commercially available ones can be used.For example, monomers such as tolylene diisocyanate, xylylene diisocyanate, metaphenylene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate,
A polyisocyanate obtained by adding a mole number of a polyisocyanate corresponding to the hydroxyl group equivalent to 1 mole of a polyol, for example, 1 mole of trimethylolpropane is reacted with 3 mole of tolylene diisocyanate. Specific examples thereof include the obtained TDI adduct, burette, trimer, allophanate, and a mixture thereof.

The urethane resin generally contains, as a main component, a polar solvent having no active hydrogen such as ketones such as methyl ethyl ketone and methyl isobutyl ketone, and esters such as ethyl acetate and butyl acetate, and aromatic solvents such as toluene and xylene. A varnish is formed as an organic solvent solution in which a non-polar solvent such as a system solvent or an aliphatic solvent such as heptane or hexane is mixed, and a colorant such as a pigment or a dye is dispersed in the varnish and used as a color coating solution. In the coating liquid,
In addition to the above-mentioned components, other resins and amines, catalysts such as organic metal salts, water stabilizers, fluidity regulators, viscosity regulators, drying regulators, auxiliary additives such as extender pigments are added and used as necessary. May be. The coating solution obtained as described above is applied to thin paper as a base material by a known means such as roll coating or gravure coating, and dried and cured to form a filling layer. The coating amount is suitably 1 to 10 g / m ^{2 in} terms of dry solid content weight, but preferably 1 to 6 g / m ² .

The acid-modified vinyl chloride copolymer which is a main component of the intermediate layer is obtained by copolymerizing vinyl chloride with at least (anhydride) maleic acid, fumaric acid, itaconic acid, (meth) acrylic acid, vinyl phosphate and the like. It is a copolymer obtained by copolymerizing an acidic acid, but it is usually preferable to use a terpolymer obtained by copolymerizing vinyl acetate, vinylidene chloride, acrylate, ethylene, etc. as a comonomer. . The ratio of vinyl chloride units in these copolymers is 50% by weight or more in ordinary polymerization, but this ratio is preferable for increasing the adhesion to the heat-sealing layer. Further, the proportion of the copolymerizable acid is preferably 0.2 to 5% by weight. If the amount is less than this range, the adhesion between the filling layer and the interlayer becomes insufficient. Problems tend to occur, such as an increase in the residual amount of the solvent, and a difficulty in uniform coating due to poor fluidity of the solution. However, those actually manufactured and marketed have a content of 0.5 to 2% by weight, which is in a preferable range. Particularly preferred is vinyl chloride-
Vinyl acetate- (maleic anhydride) maleic acid copolymer, which is the most common among these copolymers, and has good physical properties such as interlayer adhesion, solubility, and compatibility, and is preferable because of good workability. . The acid-modified vinyl chloride-based copolymer also includes a polar solvent having no active hydrogen such as ketones such as methyl ethyl ketone and methyl isobutyl ketone and esters such as ethyl acetate and butyl acetate as main components, and toluene,
An organic solvent solution in which an aromatic solvent such as xylene or an aliphatic solvent such as heptane or hexane, an alcohol such as isopropyl alcohol or butanol is mixed as a diluent, and a urethane resin for coating the filling layer. Similarly, a coating liquid in which other resins and additives are mixed as necessary is applied on the filling layer, dried and cured to form an intermediate layer. The coating amount of the coating liquid thus obtained is suitably from 1 to 10 g / m ^{2 in} terms of dry solid content, and preferably from 1 to 6 g / m ² . The additive is a usual coating additive, and the amount of the additive varies depending on the type of the additive. For example, if it is a filler,
For certain compositions, 3% for silica powder, 1 for talc
Like 8%.

The vinylidene chloride-based copolymer as a main component of the heat sealing layer includes vinylidene chloride-acrylonitrile copolymer, vinylidene chloride-vinyl chloride copolymer, vinylidene chloride-vinyl acetate copolymer, vinylidene chloride. A (meth) acrylic acid alkyl ester copolymer or the like, or a terpolymer containing a copolymerizable carboxylic acid such as (meth) acrylic acid as a third component in these compositions is used. The vinylidene chloride-based copolymer is commercially available in the form of an organic solvent solution or an emulsion, and can be used as it is or by adding other resins and additives as needed. The additives in the heat-sealable layer are the same as in the case of the above-mentioned intermediate layer. The obtained coating liquid is applied on the intermediate layer in the same manner as the urethane resin in the case of coating the sealing layer, and dried and cured to form a heat-sealing layer also serving as a moisture-permeable layer. The coating amount is usually 1 to 10 g / m ^{2 in} terms of dry solid content,
Preferably it is 1 to 6 g / m ² . By forming the sealing layer containing a urethane resin as a main component on one side of the thin paper in this way, it is possible to prevent flow during heat sealing while maintaining burstability. Further, the formation of a heat-sealing layer containing a vinylidene chloride-based copolymer as a main component has the advantage of ensuring the heat-sealing with a container made of a polyvinyl chloride sheet. By forming an intermediate layer containing an acid-modified vinyl chloride copolymer as a main component between the layers, adhesion between the sealing layer and the heat sealing layer is ensured, and there is no resin flow or unevenness of hue as a whole. Thus, a heat-sealing lid material in which characters and symbols printed between layers can be clearly read is obtained.

The blister packaging container of the present invention comprises a container body molded from a conventionally known thermoplastic sheet into a form provided with a pocket portion for accommodating an object to be stored and a flange portion extending so as to surround the opening portion thereof. The heat sealable lid material of the present invention is heat sealed to the flange so as to close the opening of the container body. Examples of the thermoplastic resin constituting the container body include polyvinyl chloride, polyethylene, and polypropylene. When the container body is formed of a vinyl chloride resin sheet, a layer mainly composed of a vinylidene chloride copolymer is formed as the heat sealing layer of the lid material as described above, and the sealing layer is heat sealed. It is preferable to form an intermediate layer mainly composed of an acid-modified vinyl chloride copolymer between the two layers. A PTP package can be obtained by facilitating the crushing of the pocket portion of the container body and easily breaking the lid material through the packaged object by the crushing of the pocket portion. When a container body having a plurality of pockets is employed, a separation line for separating the pockets from each other may be formed in the flange.

[0019]

Next, embodiments of the heat-sealing lid material and the packaging container of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing one embodiment of a layer structure of a lid material of the present invention, and FIG. 2 is a perspective view showing one embodiment of a packaging container of the present invention.
In FIG. 1, A indicates a cover material, and the cover material A is a base material 1 made of tissue paper and a sealing layer 2 provided thereon.
And an intermediate layer 3 provided thereon and a heat-sealable layer 4 provided thereon. Normally, information on the packaged object (tablet in FIG. 2) 5 is printed on the sealing layer 2 by characters or symbols, or a decorative design. Reference numeral 6 in FIG. 1 is such a printing ink. In some cases, the intermediate layer 3 can be omitted depending on the resin constituting the heat-sealing layer 4.

In the lid material A constructed as described above, after the article to be packaged 5 is accommodated in the pocket portion 8 of the container body 7, the heat-sealing layer 4 is heat-sealed to the flange portion 9 of the other container body 7. I do. Although the container body 7 varies depending on the type of blister package, in the case of the PTP package B shown in FIG. 2, a large number of pockets for accommodating the contents (contents) 5 from one thermoplastic resin sheet. 8 and a flange portion 9 extending so as to surround an opening 10 thereof. The lid member A is heat-sealed on the lower surface of the flange portion 9 in the drawing. Although FIG. 2 shows a PTP package, the packaging container of the present invention is not limited to this, and includes an entire blister package for packaging food, sanitary goods, miscellaneous goods, and the like other than the PTP package. Furthermore, the heat-sealable lid material of the present invention can be used not only for blister packaging but also for inner lids of bottles, cans, and the like, and its use is not particularly limited.

Next, a sealing layer constituting the lid material of the present invention,
The intermediate layer and the heat-sealable layer will be described in more detail according to Examples and Comparative Examples.

Example 1 (Preparation of Colored Coating Solution for Forming Filler Layer) Based on the composition described in Example 1 column of Table 1, polyester resin A and a hydroxyl group-containing vinyl resin were dissolved in a solvent. To produce a varnish, into which the pigment is
GNPT and silica powder were mixed and kneaded. After the dispersion of the pigment was completed, a polyisocyanate compound was added and uniformly mixed to prepare a blue coating liquid for a filling layer for forming a filling layer.

(Production of Coating Liquid (Acid-Modified Vinyl Chloride Copolymer Solution) for Forming Intermediate Layer) Vinylite VMC
H (acid-modified vinyl chloride copolymer manufactured by Union Carbide, USA, vinyl chloride / vinyl acetate / maleic acid = 86)
/ 13/1 (weight ratio) with an average degree of polymerization of 400)
An intermediate layer coating for forming an intermediate layer by dissolving 20 parts (parts by weight, hereinafter the same) in 80 parts of a mixed solvent (methyl ethyl ketone / toluene / ethyl acetate = 3/3/4 (weight ratio)) A working fluid was produced.

(Production of Coating Liquid (Vinylidene Chloride Copolymer Dispersion) for Forming Heat-Sealable Layer) Saran Latex L-502 (vinylidene chloride copolymer emulsion manufactured by Asahi Kasei Corporation) To 100 parts of 50%), 0.8 parts of ADEKANOL 140S (fluidity modifier manufactured by Asahi Denka Kogyo Co., Ltd.) is added and mixed uniformly to form a heat-sealing layer also serving as a moisture-permeable layer. Was prepared.

(Preparation of heat-sealing lid material) Basis weight 25.8 g / m ²
Was used as a base material, and coating was performed using a gravure plate of 150 mesh by a gravure coating machine. The above-mentioned blue coating liquid for the filling layer was used as an ink to dry the coating amount of about 1.
Gravure coating to 5 g / m ² , ambient temperature 160
The mixture was passed through a drying oven at 20 ° C. for 20 seconds to form a filling layer. Next, using the same coating machine, the above-mentioned coating solution for an intermediate layer was coated so as to have a dry coating amount of about 2 g / m ^{2, and} was passed through a drying furnace at an atmospheric temperature of 150 ° C. for 20 seconds. To form an intermediate layer. Finally, in the same manner, the above-mentioned coating liquid for a heat-sealable layer is coated on the intermediate layer so as to have a dry coating amount of about 3 g / m ^2, and is dried in an oven at an atmospheric temperature of 150 ° C. for 20 seconds. The heat-sealing layer was formed by passing through to form a heat-sealing lid material based on glassine paper.

(Heat Sealing Test) The heat sealable layer of the heat sealable lid material based on glassine paper obtained is brought into contact with a hard vinyl chloride resin sheet having a thickness of 250 μm (VSS1202 manufactured by Sumitomo Bakelite Co., Ltd.). From the glassine paper side using a heat sealing bar having a heat sealing temperature of 180 °.
° C., subjected to heat sealing under conditions of a heat sealing pressure of 4.0 kg / cm ² and pressing time 1 sec, was observed the state of the sealing layer from the heat sealing surface, the appearance of the change due to the heat sealing was not observed, No color run was observed. Holding glassine paper and vinyl chloride resin sheet, peeling speed 200mm / min, peeling angle 180
Although peeling was carried out under the conditions of °, the so-called substrate breakage of glassine paper occurred, and the heat sealing strength was sufficient.

Example 2 In Example 1, as described in Example 2 in Table 1, the hydroxyl component-containing vinyl resin was used as the only polyester component in the blue coating solution for the filling layer. A sample was prepared and tested in the same manner as in Example 1 except for the absence. As a result of the test by heat sealing, as in Example 1, no change in appearance was observed, no color flow was observed, and the result of the peeling test showed that the base material of glassine paper was broken and the heat sealing strength was sufficient. Was.

Example 3 The procedure of Example 1 was repeated, except that only the urethane resin having terminal isocyanate groups was used as the polyol component in the blue coating solution for the filling layer as described in Example 3 in Table 1. A sample was prepared and tested in the same manner as in Example 1. As a result of the test by heat sealing, as in Example 1, no change in appearance was observed, no color flow was observed, and the result of the peeling test showed that the base material of glassine paper was broken and the heat sealing strength was sufficient. Was.

Example 4 In Example 1, a polyester resin B having a large molecular weight was used in place of the polyester resin A as the polyol component in the blue coating solution for the filling layer as described in the column of Example 4 in Table 1. A sample was prepared and tested in the same manner as in Example 1 except for the above. As a result of the test by heat sealing, as in Example 1, no change in appearance was observed, no color flow was observed, and the result of the peeling test showed that the base material of glassine paper was broken and the heat sealing strength was sufficient. Was.

Comparative Example 1 SS1 / 4 second nitrocellulose (manufactured by Daicel Chemical Industries, Ltd.), 85.7 parts, polyvinyl butyral resin (Sekisui Chemical) according to one type of general heat-resistant gravure printing ink Made by Kogyo Co., Ltd., trade name: SREC BL-
1) 40.0 parts and 125.7 parts of an epoxy resin (trade name: Epicoat # 1007, manufactured by Yuka Ciel Co., Ltd.) in each of the above Examples, a mixed solvent 374. 3 parts and dissolved in the same blue pigment as used in each of the above Examples, Fast Gamble-GNP
T30 parts were added and kneaded to produce a coating liquid for a sealing layer for forming a sealing layer. A sample was prepared and tested in the same manner as in Example 1 except that the obtained coating solution for a sealing layer was used. As a result of the test by heat sealing, a color flow phenomenon occurred, a change in appearance was clearly recognized, and a part of blue shading was observed. As a result of the peeling test, the substrate of glassine paper was broken, and the heat sealing strength was sufficient.

Comparative Example 2 Vinylite VYHH (vinyl chloride copolymer manufactured by Union Carbide Co., USA, vinyl chloride / vinyl acetate = 87 /
13 (weight ratio), 20 parts of a polymer having an average degree of polymerization of 450 was dissolved in 80 parts of a mixed solvent (methyl ethyl ketone / toluene / ethyl acetate = 3/3/4 (weight ratio)) to form an intermediate layer. Was prepared. A sample was prepared and tested in exactly the same manner as in Example 1 except that the above-mentioned coating solution for an intermediate layer was used. No change in appearance was observed in the heat sealing test, and no color flow occurred.
However, as a result of the peeling test, it was easily peeled between the filling layer and the intermediate layer, and the adhesion was not sufficient.

[0032]

[Table 1] Note 1. The numbers in the table are parts by weight. (1) Polyester resin manufactured by Nippon Polyurethane Industry Co., Ltd., trade name Nipporan 1100, solid content 100%. (2) A polyester resin manufactured by Nippon Polyurethane Industry Co., Ltd., trade name Nipporan 3124, a 50% solids ethyl acetate solution. (3) One-part urethane resin manufactured by Nippon Polyurethane Industry Co., Ltd., trade name Nipporan 2304, a methyl ethyl ketone solution having a solid content of 35%. (4) United States Union Carbide vinyl chloride resin,
Brand name VINYLITE VAGH (vinyl chloride / vinyl acetate /
(Polyvinyl alcohol = 91/3/6 (weight ratio) and an average degree of polymerization of 500). (5) Blue pigment manufactured by Dainippon Ink and Chemicals, Inc. (6) Synthetic silica powder manufactured by Fuji Silysia Chemical Ltd. (formerly Fuji Devison Chemical Co., Ltd.), trade name: Syloid 244. (7) Polyisocyanate manufactured by Nippon Polyurethane Industry Co., Ltd., trade name Coronate L, TDI / TMP = 3 mol /
1 mol addition compound, 75% solids in ethyl acetate.

[0033]

As described above, in the heat-sealing lid material based on thin paper such as glassine paper as in the present invention, a sealing layer mainly composed of urethane resin is provided on one surface of the substrate. In the case where the heat sealing layer is provided on the upper surface, the sealing layer does not flow at the time of heat sealing, so that it does not have an unsightly appearance. Therefore, even when the sealing layer is colored, a phenomenon such as color flow occurs. And a beautiful appearance without color unevenness is always obtained. Further, on the sealing layer, an intermediate layer mainly composed of an acid-modified vinyl chloride copolymer and a heat-sealing layer mainly composed of a vinylidene chloride copolymer are coated in this order. The provided heat-sealing lid material has a high heat-sealing property with respect to the container body formed from the vinyl chloride resin sheet, and the heat resistance of the sealing layer is remarkably improved as described above. The resin layer has good adhesion between layers and does not cause delamination. The packaging container of the present invention has a beautiful appearance and can be manufactured at low cost because the sealing layer does not flow during heat sealing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing one embodiment of a layer structure of a lid member of the present invention.

FIG. 2 is a perspective view showing one embodiment of the packaging container of the present invention.

[Explanation of symbols]

 Reference Signs List A cover material 1 base material 2 filling layer 3 intermediate layer 4 heat-sealing layer B PTP package 7 container body 8 pocket 9 flange 10 opening

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshitaka Kawamura 4-92-13, Misono-cho, Yao-shi, Osaka (72) Inventor Masaaki Okamoto 1-4-5, Jonancho, Takatsuki-shi, Osaka (72) Inventor Hironobu Kohama 1-10-24, Shodai Minamicho, Hirakata City, Osaka Prefecture (56) References JP-A-54-21474 (JP, A) JP-A-3-51400 (JP, A) JP-A 54-26567 (JP, A) U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 75/00-75/70 D21H 11/00-27/42

Claims (14)

(57) [Claims] 1. A thin paper comprising a base material made of tissue paper, a sealing layer mainly composed of urethane resin provided on one side of the base material, and a heat-sealing layer provided thereon. Heat sealable lid material. 2. The lid material according to claim 1, wherein an intermediate layer for improving interlayer adhesion between the sealing layer and the heat-sealing layer is interposed. 3. The heat-sealing layer is mainly composed of a vinylidene chloride-based copolymer, and between the heat-sealing layer and the substrate is mainly composed of an acid-modified vinyl chloride-based copolymer. 3. The lid material according to claim 2, wherein an intermediate layer is interposed. 4. The lid material according to claim 1, wherein a printing layer is provided on the filling layer. 5. The lid according to claim 1, wherein the thin paper is selected from the group consisting of glassine paper, rice paper, India paper, carbon paper base paper, type copy paper, and condenser paper. 6. The base material is coated with a coating liquid in which a two-pack polyurethane containing a polyol having a hydroxyl group and a polyisocyanate as main components in an organic solvent is filled. 4. The lid according to claim 1, wherein the lid is dried and cured. 7. The filling layer according to claim 1, wherein the weight of the dry solid content is 1 to 7.
The lid material according to claim 6, characterized in that provided at 10 g / m ^2. 8. The lid material according to claim 1, wherein the heat-sealing layer has a moisture-permeation preventing property. 9. An acid-modified vinyl chloride copolymer, which is a main component of the intermediate layer, comprises at least 50% by weight of vinyl chloride;
Ternary copolymerization of 0.2 to 5% by weight of a copolymerizable acid with one or more comonomers selected from the group consisting of vinyl acetate, vinylidene chloride, acrylates and ethylene 4. The lid material according to claim 3, wherein the lid material is formed by uniting. 10. The lid material according to claim 3, wherein the acid-modified vinyl chloride copolymer as a main component of the intermediate layer is a vinyl chloride / vinyl acetate / (anhydride) maleic acid copolymer. 11. A container body molded from a thermoplastic sheet into a form having a pocket portion for accommodating an object to be stored and a flange portion extending so as to surround the opening portion thereof, and the opening portion of the container body is closed. A blister packaging container comprising the lid material according to any one of claims 1 to 10, which is heat-sealed to the flange portion. 12. The packaging container according to claim 11, wherein the container body is formed from a vinyl chloride resin sheet. 13. The container according to claim 1, wherein the pocket portion of the container body is easily crushed, and the lid member can be easily broken through the packaged object by crushing the pocket portion.
13. The packaging container according to 1 or 12. 14. The packaging container according to claim 11, wherein the container body has a plurality of pockets, and a separation line for separating the pockets is formed in the flange.