JP2001287317A - Laminate, and lid material, soft packaging material and composite paper container using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminate not lowered in lamination strength. SOLUTION: The laminate contains layered constitution such that a barrier layer 4(A-layer) comprising either one of a metal foil layer, a metallized film layer or an inorganic compound vapor-deposited film layer, an emulsion type coating layer 3(B-layer) obtained by neutralizing a carboxylic acid portion of an ethylene-α,β-unsaturated carboxylic acid with a weight average molecular weight (Mw) of 104-105 and a resin layer 2(C-layer) which comprises either one of resins selected from polyethylene, polypropylene, an ethylene/α,β- unsaturated carboxylic acid copolymer, esterified matter thereof or ionic crosslinked thereof, acid anhydride modified polyolefin or olefinic copolymer, epoxy compound modified polyolefin or olefinic copolymer, silane modified polyolefin or olefinic copolymer and ethylene/vinyl acetate copolymer or a blend of two or more kinds of resins, are laminated in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for producing a barrier layer, wherein the metal used is a metal foil such as aluminum, a metal surface of a metal-deposited film, or a metal-deposited surface of an inorganic compound-deposited film such as alumina. A laminate having good laminate strength without being affected by the state of oxidation or contamination of its surface, and which does not decrease in laminate strength even when various strongly permeable substances are packaged. . This laminate is suitably used for a lid material, a soft packaging material, a composite paper container composited with paper, and the like.

[0002]

2. Description of the Related Art In the field of packaging, metal foils and metallized films typified by aluminum foils and vapor-deposited films have a light-shielding property and are used as barrier layers for protecting the contents from oxygen and water vapor. Used as one. Also, aluminum foil is used as a lid material for cup containers such as cup ramen because it can maintain its shape (dead-holding property) when it is bent. As described above, in order to impart barrier properties and other functions to a packaging material (package), an aluminum foil or an aluminum vapor-deposited film is often used as an intermediate layer of the laminate. Recently, a transparent vapor-deposited barrier film having a barrier property imparted by vapor-depositing an inorganic compound such as silica or alumina has also been used.

[0003] A laminate using such a metal foil, a metal-deposited film, or an inorganic compound-deposited film is further processed and used in various packaging forms. As a method of producing the laminate, particularly in the case of an aluminum-deposited surface of an aluminum foil or an aluminum-deposited film, an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, and an ethylene-methacrylic acid copolymer are used. 2. Description of the Related Art Lamination of an ethylene-α, β unsaturated carboxylic acid such as an ionic crosslinked product or an ionic crosslinked product thereof using a method such as extrusion lamination is performed. However, the laminate thus obtained has the following problems.

[0004] As a first problem, it is well known that the aluminum-deposited surface of an aluminum foil or an aluminum-deposited film has its surface oxidized and exists in the form of aluminum oxide. Generally, when laminating the above ethylene-α, β unsaturated carboxylic acid or its ion cross-linked product on aluminum foil or its vapor-deposited film, if aluminum foil is used, open the aluminum foil supplied by the aluminum foil manufacturer. Immediately afterwards, in the case of an aluminum-deposited film, it is preferable to produce a laminate in which the above-mentioned ethylene-α, β-unsaturated carboxylic acid or its ionic crosslinked product is deposited immediately after aluminum deposition. However, in the manufacturing process of the laminated body, there is a case where an aluminum foil or a vapor-deposited aluminum film is used in a state where the time has elapsed after opening and the oxidation of the aluminum surface is in progress or the contamination is in progress. Even if an aluminum foil or an aluminum vapor-deposited film in such a state is used and ethylene-α, β-unsaturated carboxylic acid or its ion-crosslinked product is laminated, good laminating properties can be obtained.
It was difficult to obtain strength.

[0005] As a second problem, when a highly permeable material is packaged in a laminate, the laminate strength between an aluminum foil or an aluminum-deposited film and an ethylene-α, β-unsaturated carboxylic acid or its ionic crosslinked product is increased. Is reduced. Aluminum foil or aluminum vapor-deposited film has good barrier properties to various components, so it has strong permeability at the laminate interface between aluminum foil or aluminum vapor-deposited film and ethylene-α, β unsaturated carboxylic acid or its ion cross-linked product. The material penetrates, resulting in laminating at the interface.
It is believed that a drop in strength occurs. Examples of such a strong osmotic substance include a fragrance of a bath agent and a blowing agent component.

[0006] As described above, aluminum foil and aluminum-deposited film are indispensable in various packaging forms because of their excellent barrier properties and functionality. Laminate due to oxidation or contamination of the surface or penetration of highly permeable substances
There was a problem that the strength of the steel sheet was lowered. Laminate due to oxidation, contamination or penetration of highly permeable substances that improved the above problems
There is a demand for a laminate that does not reduce the strength of the laminate.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the metal used as the barrier layer is a metal foil such as aluminum, a metal surface of a metal-deposited film or a metal-deposited surface. Or, when the inorganic compound surface of the inorganic compound vapor deposition film such as alumina has good laminating strength without being affected by the oxidation or the contamination state of the surface, and when packaging various highly permeable materials Even in this case, it is an object of the present invention to provide a laminate in which the laminate strength does not decrease.

[0008]

In order to solve the above-mentioned problems, the invention according to claim 1 comprises a metal foil layer, a metal-deposited film layer or an inorganic compound-deposited film layer, and a barrier layer (A layer). An emulsion coating layer (B layer) obtained by neutralizing a carboxylic acid site of an ethylene-α, β unsaturated carboxylic acid having a molecular weight in the range of 10 ⁴ to 10 ⁵ with an alkali, polyethylene, polypropylene,
Ethylene-α, β-unsaturated carboxylic acid copolymer or its esterified or ionically crosslinked product, acid anhydride-modified polyolefin or olefin-based copolymer, epoxy compound-modified polyolefin or olefin-based copolymer, silane-modified polyolefin or olefin-based A resin layer (C layer) composed of a single substance of a resin selected from a copolymer and an ethylene-vinyl acetate copolymer or a blend of two or more kinds thereof, and a layer configuration in which the layers are laminated in this order. It is a laminated body.

According to a second aspect of the present invention, in the laminate according to the first aspect, the metal foil layer, the metal-deposited film layer, or the inorganic compound-deposited film layer as the layer A is an aluminum foil layer, an aluminum-deposited film layer, or It is characterized by being an alumina deposited film layer.

[0010] The third aspect of the present invention is the first or second aspect.
The laminate according to the above, wherein the ethylene-α, which is the B layer,
The alkali for neutralizing the carboxylic acid moiety of the β-unsaturated carboxylic acid is ammonia or alkanolamine.

According to a fourth aspect of the present invention, there is provided a lid material using the laminate according to any one of the first to third aspects.

According to a fifth aspect of the present invention, there is provided a soft wrapping material using the laminate according to any one of the first to third aspects.

According to a sixth aspect of the present invention, there is provided a composite paper container wherein the laminate according to any one of the first to third aspects is combined with paper for use.

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a laminate according to the present invention. FIG. 1 is a cross-sectional view showing an example of the configuration of a product using the laminate of the present invention. The product using the laminate 10 of the present invention is, for example, a metal foil layer or a metal vapor-deposited film layer or an inorganic material layer on the thermoplastic resin layer 5 side of a processing raw material in which a paper base material 6 and a thermoplastic resin 5 are laminated. Emulsion obtained by neutralizing any one of the barrier layer 4 (A layer) of the compound vapor-deposited film layer and a carboxylic acid site of an ethylene-α, β unsaturated carboxylic acid having a molecular weight of 10 ⁴ to 10 ⁵ with an alkali. System coating layer 3 (layer B), polyethylene, polypropylene,
Ethylene-α, β-unsaturated carboxylic acid copolymer or its esterified or ionically crosslinked product, acid anhydride-modified polyolefin or olefin-based copolymer, epoxy compound-modified polyolefin or olefin-based copolymer, silane-modified polyolefin or olefin-based A laminated body 10 having a configuration in which a resin layer 2 (C layer) composed of a simple substance or a blend of two or more kinds of any resin selected from a copolymer and an ethylene-vinyl acetate copolymer is laminated in this order. Further, the sealant layer 1 is further laminated on the C layer 2 side.

The A layer 4 is a barrier layer of any one of a metal foil layer, a metal vapor-deposited film layer, and an inorganic compound vapor-deposited film layer. It is possible to use one in which an inorganic compound such as magnesia is deposited. Particularly, an aluminum foil or an aluminum vapor-deposited film is preferable. These layers can be formed by a known method. In particular, in the case of an aluminum vapor-deposited film, various substrates such as a stretched polyester film, a stretched polypropylene film, and a stretched nylon film can be used as the base material for the vapor deposition. It is possible to choose. It is more effective for the aluminum foil layer to be subjected to a treatment such as a hot water modification treatment (boehmite treatment) if necessary, since the aluminum surface can be functionalized.

The B layer 3 is an emulsion coating layer obtained by neutralizing a carboxylic acid site of an ethylene-α, β unsaturated carboxylic acid having a molecular weight in the range of 10 ⁴ to 10 ⁵ with an alkali. Mainly comprising ethylene-
It is preferable that the carboxylic acid site such as an acrylic acid copolymer or an ethylene-methacrylic acid copolymer is locally or entirely neutralized with an alkali to form an emulsion coating agent. In particular, ammonia and alkanolamine are preferred for neutralization with this alkali,
In particular, the use of alkanolamines is advantageous in low-temperature film-forming properties,
It is preferable from the viewpoint of the adhesion of the aluminum foil or the aluminum-deposited film to the aluminum-deposited surface. In particular, by setting the resin component of the coating agent in a molecular weight range of 10 ⁴ to 10 ⁵ , even if the aluminum surface is oxidized or contaminated,
Adhesion to an aluminum foil or an aluminum vapor-deposited surface is remarkably improved, and when a highly permeable material is wrapped, a decrease in the laminate strength due to penetration into the laminate can be prevented.

As the C layer 2, high density polyethylene, low density polyethylene, medium density polyethylene, ethylene-α
Ethylene resins such as olefin copolymers, homo-black / random polypropylene resins, propylene resins such as propylene-α-olefin copolymers, ethylene-acrylic acid copolymers and ethylene-methacrylic acid copolymers Ethylene-α, β unsaturated carboxylic acid copolymers such as ethylene-methyl acrylate, ethylene-ethyl acrylate, ethylene-methyl methacrylate and ethylene-ethyl methacrylate Esterified products of acid copolymers, ionic cross-linked products of ethylene-α, β-unsaturated carboxylic acid copolymers obtained by crosslinking carboxylic acid sites with sodium ions and zinc ions, ethylene-maleic anhydride graft copolymers and ethylene-
Acid anhydride-modified polyolefins represented by terpolymers such as ethyl acrylate-maleic anhydride, epoxy compound-modified polyolefins such as ethylene-glycidyl methacrylate copolymer, vinyltrimethoxysilane, vinyltrimethoxysilane Vinyl silane such as ethoxy silane or methacryloxy propyl trimethoxy silane or acrylic silane modified polyolefin or olefin copolymer, selected from a resin alone or a blend of two or more resins selected from ethylene-vinyl acetate copolymer. If necessary, various additives (antioxidants, tackifiers, fillers, various fillers, etc.) can be added to these resins. The resin of the C layer is variously selected depending on the function required as a packaging material, and can be used as an adhesive resin of the sealant layer of the lid material described below as necessary. Further, the resin of the C layer is not limited to these types, and various resins can be used as needed.

A structural example as an example in which the laminate of the present invention is used for a lid member is shown below. (1) Paper layer / thermoplastic resin layer / A layer / B layer / C layer (sheet
(2) paper layer / thermoplastic resin layer / A layer / B layer / C layer / sheet
Runt layer (3) Thermoplastic resin layer / adhesive layer / A layer / B layer / C layer
(Sealant layer) (4) thermoplastic resin layer / adhesive layer / A layer / B layer / C layer /
Examples of the sealant layer (1) and (3) are as follows.
The examples (2) and (4) function as the adhesive resin layer of the sealant layer newly provided on the C layer side.

Various types of paper can be used as a base material of a processed raw material using the laminate as a product. The thermoplastic resin layers (1) and (2) are necessary for laminating the paper layer and the layer A. If the layer A is an aluminum foil, a low-density polyethylene resin is laminated by high-temperature processing. Is possible. If the layer A is an aluminum vapor-deposited film, a laminate of the thermoplastic resin layer and the layer A is prepared in advance using a urethane-based adhesive by a method such as dry lamination, and then wet lamination is performed. Alternatively, a B layer and a C layer can be finally provided by laminating with a paper layer by a method such as a non-solvent laminating method.

The sealant layer can be selected according to the container serving as the cover material as the cover material. If the cover material is a polystyrene-based material, an ethylene-vinyl acetate copolymer is used. It is possible to use a hot-melt type or film type sealant obtained by adding a tackifier to an ethylene-acrylic acid copolymer or a polyethylene-based resin if the adherend is a polyethylene-based resin,
If the adherend is a polypropylene-based resin, a polypropylene-based resin can be selected. In addition, these
For the runt, a cohesive peeling type or delamination type sealant layer for imparting functionality such as easy peeling can be used.

Further, the thermoplastic resin layer of the processed raw material of the above (3) and (4) may be a stretched polyester film,
Various films such as a stretched propylene film and a stretched nylon film can be used. As the adhesive layer, various types of adhesives such as the urethane-based and imine-based adhesives described above can be used, and the coating method is gravure coating, reverse coating, or roll coating. It is possible to provide the adhesive layer using a known method such as ting. Further, if necessary, various ink layers can be provided by a known method such as the above-mentioned gravure coating in order to impart design properties.

Next, a structural example as an example in which the laminate of the present invention is used for a soft packaging material is shown below. (5) thermoplastic resin layer / adhesive layer / A layer / B layer / C layer (sealant layer) (6) thermoplastic resin layer / adhesive layer / A layer / B layer / C layer /
Sealant layer These examples have a relatively simple configuration used as a soft packaging material, but of course, other layers can be interposed depending on the functionality. Various films such as the above-mentioned stretched polyester film, stretched propylene film, stretched nylon film and the like can be used as the base material for the thermoplastic resin layer of the processed raw material. As the adhesive layer, the above-mentioned adhesive such as urethane can be provided by using gravure coating or the like, and similarly, various ink layers can be provided by gravure coating or the like.

In the above configuration example, a soft package is taken as an example, so that a sealant layer in consideration of the seal between the sealants is used as the sealant layer in the above (5) and (6). For example, low-density polyethylene, ethylene-α-olefin copolymer, polypropylene-based resin, or the like can be used. The flexible packaging can be used in various forms such as a primary packaging such as a sachet stored in a paper secondary packaging container and a pouch filled with a liquid material.

Further, a constitutional example as an example of using the laminate of the present invention in a composite paper container is shown below. (7) thermoplastic resin layer / paper layer / thermoplastic resin layer / A layer /
B layer / C layer (sealant layer) (8) Thermoplastic resin layer / paper layer / thermoplastic resin layer / A layer /
B layer / C layer / Sealant layer In these examples, the configuration is in consideration of a composite paper container typified by a liquid paper container or the like, but for other uses, for example, a composite paper container filled with a bath agent powder. Can be used,
It is also possible to change to a layer configuration according to those requirements. As the thermoplastic resin layer as the outermost layer, a polyolefin resin such as a polyethylene resin or a polypropylene resin can be provided in consideration of moisture proof and waterproof of the paper layer, but is not particularly limited thereto. The same resin as in the case of the lid member described above can be used for the thermoplastic resin layer corresponding to the intermediate layer.

As the sealant layer having the above structure, a polyethylene resin such as low-density polyethylene can be used. However, since a variety of components such as flavor components and medicinal components of the contents are not adsorbed, polyester is used. It is also possible to use system sealants.

Although shown in the above configuration examples (1) to (8), the present invention is not particularly limited to these configurations, and it is possible to obtain laminates having various configurations according to required quality. However, it is an essential condition that the laminate of the present invention includes a laminate having a configuration in which layers A, B, and C are laminated in this order. Hereinafter, a method of laminating the A layer / B layer / C layer (if necessary, a sealant layer) will be described.

Preparation of [Layer A / Layer B] The carboxylic acid portion of the ethylene-α, β unsaturated carboxylic acid is neutralized with an alkali on the aluminum surface or the aluminum vapor-deposited surface of the aluminum foil or the aluminum-deposited film as the A-layer. A layer B comprising an emulsion-based coating layer obtained as described above is provided. The layer B is formed by coating the above-mentioned emulsion coating agent on the layer A using a known method such as gravure coating, bar coating, and reverse coating, and then drying the coating. A laminate of layer B is formed.

[Formation of Layer A / Layer B / Layer C (/ Sealant Layer)] In order to provide the layer C on the laminate of the layer A / B obtained by the above-mentioned method, the extruded laminating layer is mainly used. The A layer / B layer / C layer is extruded by directly extruding the C layer melt-plasticized by a single screw extruder or a twin screw extruder onto the B layer.
It is possible to obtain layers. If necessary, the C layer and the sealant layer are formed by co-extrusion to form the A layer / B layer.
It is also possible to obtain a layer / C layer / sealant layer configuration.

Depending on the packaging form, a laminate consisting of layer A / layer B / C or layer A / layer B / C / sealant is prepared in advance, and is bonded to another substrate in a separate step. be able to. Alternatively, another substrate may be prepared first, and then a laminate composed of the A layer / B layer / C layer or the A layer / B layer / C layer / sealant layer may be laminated.

The thus obtained laminate of the present invention can be developed in various packaging forms such as a lid material, a soft packaging material, and a composite paper container combined with paper.

[0031]

Examples of the present invention will be described below, but the present invention is not limited to these examples.

Example 1 A sample in which a polyester film substrate (12 μm) and an aluminum foil (7 μm) were laminated in advance using a urethane-based adhesive was prepared, and stored in that state for one week in a normal environment. These samples were cut into A4 size cut samples. On this cut sample, layer B [alkanolamine neutralized ethylene-acrylic acid copolymer (emulsion) molecular weight 20000-3000]
[0] was coated with a bar coater and dried to prepare a layered product of layer A / layer B. Then, the single screw extruded laminator
Layer C (low-density polyethylene resin) using a
A film was formed at a temperature of ° C. At that time, the cut sample was previously bonded to a base material passed through an extrusion laminating machine, whereby a layer C was laminated on a layer B of the cut sample.
The processing speed at this time is 50 m / min. And the thickness of the C layer is 3
0 μm. As a sample for measuring the peel strength, a laminate having the following configuration was prepared by using a polyester film 25 μm / adhesive layer / low-density polyethylene resin 20 μm prepared in advance as a sand substrate at the same time when the laminate was prepared. The evaluation was performed by creating a body.
A peeling evaluation sample having a structure of polyester film (through substrate) / layer A / layer B / layer C / sand substrate was prepared, and the peeling strength was measured based on the following evaluation method. Table 1 shows the results. [Evaluation Method] A peeling trigger was previously formed between the A / B layers of the sample obtained by the above method, and the peeling strength of the sample was measured. At that time, a peeling speed of 300 mm / min. I went in. Further, in the test for a strong permeation-resistant substance, a spreading agent and a bathing agent were selected as the strongly penetrable substance, packed in a pouch (processed without using a sand base material) prepared using the above sample, and heated at 40 ° C.-90. %, The peel strength of the sample stored for 4 weeks was measured.

Example 2 The same procedure as in Example 1 was carried out except that a film was formed at a temperature of 310 ° C. using an ethylene-methacrylic acid copolymer as the C layer. Then, the same evaluation as in Example 1 was performed. Table 1 shows the results.

<Example 3> As the layer C, an ethylene-glycidyl methacrylate copolymer was used at 280 ° C.
It is the same as Example 1 except that the film was formed at the temperature of Then, the same evaluation as in Example 1 was performed. Table 1 shows the results.

Example 4 The same procedure as in Example 1 was carried out except that a film was formed at a temperature of 340 ° C. using an ethylene-epoxidized vegetable oil blend as the layer C. And Example 1
The same evaluation was performed. Table 1 shows the results.

Example 5 An aluminum-evaporated polyethylene terephthalate film (12 μm) was used as the A layer, and ethylene-ethyl acrylate / ethylene-vinyl acetate-glycidyl methacrylate-methacryloxypropyl was used as the C layer. Using trimethoxysilane, 230
It is the same as Example 1 except that the film was formed at a temperature of ° C. Then, the same evaluation as in Example 1 was performed. Table 1 shows the results.

Example 6 A laminate composed of a paper layer, a thermoplastic resin layer, an A layer, a B layer, a C layer, and a sealant layer having the structure shown in FIG. 1 was prepared. At that time, for convenience in the process, the paper layer / thermoplastic resin layer [low-density polyethylene layer (16 μm)] /
A layer (Al foil (7 μm)) was prepared first, and 2 days later B
The layer, the C layer and the sealant layer were laminated. About layer B, alkanolamine neutralized ethylene-acrylic acid copolymer (emulsion) [molecular weight 20,000-3000]
0)] was applied onto the above-mentioned layer A by gravure coating, and after drying, the layer C and the sealant layer were laminated in-line. An ethylene-methacrylic acid copolymer was extruded as the C layer, and a polyethylene-based ethyl peel sealant was extruded as the sealant layer. On the aluminum foil surface of layer A after 2 days,
Despite the lamination of the B layer, the adhesion between the A layer and the B layer is very good. When the container is actually sealed as a lid and opened, the delamination between the A layer and the B layer is performed. Caused no double lid problem.

Example 7 Thermoplastic resin layer / adhesive layer /
A laminate composed of A layer / B layer / C layer (sealant layer) and having the configuration shown in FIG. 2 was prepared. The thermoplastic resin layer is a polyethylene terephthalate film 25 μm, and the C layer is an ethylene-methacrylic acid copolymer (formed at 310 ° C.) 30
μm. Using this laminate, a soft wrapping material to be used for packaging a propellant was prepared, and the propellant was actually packed therein.
It was stored in a storage environment of the same evaluation method as that of As a result, peeling of layer A / layer B by the contents was not recognized.

<Example 8> A laminate having the structure of thermoplastic resin layer / paper layer / thermoplastic resin layer / A layer / B layer / C layer / sealant layer was prepared, and a composite paper container was prepared. . The thermoplastic resin layer was a low-density polyethylene, and the sealant layer was an ethylene-α-olefin copolymer of 20 μm. The C-layer was coextruded with an ethylene-methacrylic acid copolymer of 20 μm. The layers were laminated by extruding on the layers. This composite paper container was filled with a powdery bath agent and stored in a storage environment according to the same evaluation method as in Example 1. As a result, peeling of layer A / layer B by the contents was not recognized.

Comparative Example 1 The same as Example 1 except that the layer B was not laminated.

<Comparative Example 2> The same as Example 2 except that the layer B was not laminated.

Comparative Example 3 The same as Example 3 except that the layer B was not laminated.

Comparative Example 4 The same as Example 4 except that the layer B was not laminated.

<Comparative Example 5> The same as Example 5 except that the layer B was not laminated.

Comparative Example 6 The procedure was the same as that of Example 6 except that the layer B was not provided. In this case, when the container was sealed and opened as in Example 6, the layer A / layer B The problem of double lids due to delamination occurred.

<Comparative Example 7> The same as Example 7 except that the B layer was not provided. In this case, when the soft package was opened to take out the contents due to the influence of the penetration of the strong penetrant. ,
Peeling occurred between layer A and layer C, and the contents could not be easily taken out.

<Comparative Example 8> The same as Example 8 except that the layer B was not provided, except that the layer A / B
The layer was peeled off, resulting in inferior functionality and appearance as a container.

[0048]

[Table 1]

As described above, the results of the peeling test and the storage test using a strongly permeable substance show that the aluminum foil layer or the aluminum vapor-deposited film layer whose surface is excessively oxidized or whose surface is contaminated has a molecular weight of 10 ⁴ to 10 ^5. Ethylene in the range
The carboxylic acid moiety of the α, β unsaturated carboxylic acid is alkali,
In particular, an emulsion coating layer obtained by neutralization with an alkanolamine is provided, and a C layer,
Alternatively, the laminate of the present invention in which a laminate is provided by providing the C layer and the sealant layer has a very good adhesion state without a decrease in the laminate strength between the A layer and the B layer. It was confirmed that there was. In addition, no decrease in laminate strength due to various strongly permeable substances was observed.

[0050]

According to the present invention, the metal used as the barrier layer is formed on a metal foil such as aluminum or a metal surface of a metal-deposited film, or a metal-deposited surface of an inorganic compound-deposited film such as alumina. Has good laminate strength without being affected by surface oxidation or contamination, and does not decrease its laminate strength even when various highly permeable materials are packaged and permeated into the laminate. It has become possible to provide a laminate. Thereby, the laminate of the present invention can be developed into various packaging forms, and is particularly suitably used for a lid material, a soft packaging material, a composite paper container combined with paper, and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a configuration of a laminate as one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a configuration of a laminate as one embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a configuration of a laminate as one embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sealant layer 2 ... C layer 3 ... B layer 4 ... A layer 5 ... Thermoplastic resin layer 6 ... Paper layer 7 ... Adhesive layer 10, 20, 30 ... Laminate

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) B65D 77/00 B65D 77/00 B F term (reference) 3E067 AA03 AA05 AB99 BB01A BB11A BB12A BB14A BB15A BB16A BB25A CA04 CA05 CA07 3E084 CC02 CC03 CC04 CC05 CC07 CC08 3E086 AB01 AD01 BA04 BA13 BA15 BA24 BA33 BB01 BB52 CA28 4F100 AA01A AB01A AB10A AB33A AK03C AK04C AK06 AK07C AK41 AK52C AK68C AK70B AK70C AK71B01 J03 BA03A01

Claims (6)

[Claims] 1. A barrier layer (A) comprising a metal foil layer, a metal-deposited film layer, or an inorganic compound-deposited film layer.
Layer) and ethylene-α, having a molecular weight in the range of 10 ⁴ to 10 ⁵ .
Emulsion coating layer (B) obtained by neutralizing the carboxylic acid site of β-unsaturated carboxylic acid with alkali.
Layer), polyethylene, polypropylene, ethylene-
α, β unsaturated carboxylic acid copolymer or its esterified or ionically crosslinked product, acid anhydride-modified polyolefin or olefin-based copolymer, epoxy compound-modified polyolefin or olefin-based copolymer, silane-modified polyolefin or olefin-based copolymer And a resin layer (C layer) composed of a single resin or a blend of two or more resins selected from the group consisting of a united resin and an ethylene-vinyl acetate copolymer. body. 2. The method according to claim 1, wherein the metal foil layer, the metal-deposited film layer, or the inorganic compound-deposited film layer, which is the A layer, is an aluminum foil layer, an aluminum-deposited film layer, or an alumina-deposited film layer. Laminate. 3. The laminate according to claim 1, wherein the alkali for neutralizing the carboxylic acid moiety of the ethylene-α, β unsaturated carboxylic acid, which is the layer B, is ammonia or alkanolamine. body. 4. A lid comprising the laminate according to any one of claims 1 to 3. 5. A soft wrapping material comprising the laminate according to any one of claims 1 to 3. 6. A composite paper container wherein the laminate according to any one of claims 1 to 3 is used in combination with paper.