JP2006007563A - Laminate and packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminate which shows excellent heat resistance and adhesive strength between an aluminum foil and a sealant layer, sufficient resistance to a highly permeable content, and becomes solid and hardly releasable through a thermal lamination process, and a packaging material. <P>SOLUTION: This laminate is constituted of: at least an outermost layer; an aluminum foil layer which has a thickness ranging from 9 to 200 μm and is surface-treated on at least a sealant layer side; an anchor coat layer formed of a coupling agent or an ionic polymer complex; a sandwiched resin layer formed of a polypropylene or a propylene-α-olefin copolymer or a polymer modified by an acid anhydride based on the polypropylene or the propylene-α-olefin copolymer, or formed of a thermoplastic resin which is a mixture series of not less than these two kinds; and the sealant layer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  In the present invention, a coupling agent or an ionic polymer complex is coated on an aluminum foil subjected to hydrothermal modification treatment, and then polyethylene, an ethylene-α-olefin copolymer, polypropylene, or propylene-α-olefin. The present invention relates to a copolymer, a polymer obtained by modifying an acid anhydride based on them, or a laminate obtained by laminating a mixture of two or more of them. More specifically, it has excellent adhesion to an aluminum foil and is like an electrolyte of a lithium battery. It is related with the packaging material excellent in the tolerance with respect to the strong permeable content.

  2. Description of the Related Art In recent years, lithium batteries that can be made ultra-thin and miniaturized have been actively developed as batteries used in mobile terminal devices such as personal computers and mobile phones, video cameras, and satellites. Unlike the metal can conventionally used as a battery packaging material, this lithium battery has a multilayer film (for example, outermost layer / barrier layer) because it is lightweight and can freely select the shape of the battery. / A structure like a sealant layer) has been used in the form of a bag.

  Lithium batteries include a positive electrode material and a negative electrode material as battery contents, an electrolyte solution in which a lithium salt is dissolved in an aprotic solvent such as propylene carbonate, ethylene carbonate, dimethyl carbonate, diethyl carbonate, and ethyl methyl carbonate, or an electrolyte solution thereof. An electrolyte layer comprising an impregnated polymer gel is included. When such a strongly permeable solvent passes through the sealant layer, there is a problem that the laminate strength between the aluminum foil layer and the sealant layer is lowered, and the electrolyte solution eventually leaks. It is essential to increase the adhesion strength between layers and to have content resistance.

Moreover, as lithium salt which is an electrolyte of a battery, substances such as LiPF ₆ and LiBF ₄ are used, and these salts generate hydrofluoric acid by hydrolysis reaction with moisture, which means that the metal surface Corrosion of the multi-layer film, resulting in a decrease in laminate strength between layers. By using aluminum foil for the barrier layer, moisture intrusion from the surface of the packaging material is substantially blocked. However, the outer packaging material for lithium batteries has a structure in which multilayer films are bonded together by heat sealing, and it cannot completely block the penetration of moisture from the end face of the seal part of the sealant layer, which is the innermost layer. It is necessary to further strengthen the laminate strength between the foil layer and the sealant layer so that the laminate strength is not lowered by the generated hydrofluoric acid.

  In addition, lithium batteries are often used for portable mobile phones, and the usage environment may be as high as 60-70 ° C., such as in a midsummer car. It is also important to have heat resistance that can maintain the heat resistance.

  The most common method for producing a multilayer film is dry lamination. However, the adhesive for the laminate uses polyester, polyester polyurethane, or polyether polyurethane, etc., and these have the disadvantage that they have low resistance to strongly permeable contents and cause a decrease in laminate strength. .

Therefore, even if the contents made of a strongly permeable material are packaged, the laminate strength between the aluminum foil as a barrier layer and the sealant layer does not decrease, and the adhesion strength is excellent, and the laminate is sufficiently strong when heat-sealed. For the purpose of providing a laminate and a laminated packaging material capable of imparting seal strength and foreign matter sealability and further imparting heat resistance, a technique such as Patent Document 1 is disclosed. .

That is, at least a packaging material having a configuration of outermost layer / aluminum foil layer / anchor coat layer / sand resin layer / sealant layer, wherein the aluminum foil layer, the anchor coat layer, and the sand resin layer are from the following layers, respectively. The laminated body characterized by becoming is shown as a well-known literature.
(1) A layer in which the aluminum foil layer has a thickness of 9 to 200 μm, and at least a surface treatment is performed on the sealant layer side.
(2) The anchor coat layer is a layer made of a coupling agent.
(3) The thermoplastic resin constituting the sand resin layer is ethylene or an ethylene-α-olefin copolymer, a polymer obtained by acid anhydride modification based on these, or a mixture of two or more thereof. Layer.

  However, the thermoplastic resin constituting the sand resin layer is composed of ethylene or an ethylene-α-olefin copolymer, a polymer obtained by acid anhydride modification based on these, or a mixture of two or more of them. For this reason, there is a disadvantage that the heat resistance is not sufficient.

The patent literature is as follows.
JP 2004-42477 A

  The present invention has been made in order to solve the above-mentioned problems, and is a laminate having a sufficient resistance to strongly penetrating contents, having excellent heat resistance and excellent adhesion strength between an aluminum foil and a sealant layer. It is possible to obtain Furthermore, it aims at providing the laminated body and packaging material which cannot be peeled more firmly by performing thermal lamination.

The present invention has been devised to solve the above problems,
The invention according to claim 1 is a packaging material comprising at least the outermost layer / aluminum foil layer / anchor coat layer / sand resin layer / sealant layer, wherein the aluminum foil layer, anchor coat layer, and sand resin layer comprise Each of the laminates is composed of the following layers.
(1) A layer in which the aluminum foil layer has a thickness of 9 to 200 μm, and at least a surface treatment is performed on the sealant layer side.
(2) The layer in which the anchor coat layer is composed of a coupling agent or an ionic polymer complex.
(3) The sand resin layer is a layer made of polypropylene or a propylene-α-olefin copolymer, a polymer obtained by acid anhydride modification based on these, or a thermoplastic resin that is a mixture of two or more of them. The invention described in 2 is the laminate according to claim 1, wherein the coupling agent constituting the anchor coat layer is a silane coupling agent.

  The invention according to claim 3 is the laminate according to claim 1, wherein the ionic polymer complex constituting the anchor coat layer is composed of a polyethyleneimine and a polysaccharide having a carboxyl group.

The invention according to claim 4 is characterized in that the ionic polymer complex constituting the anchor coat layer is composed of polyethyleneimine and a copolymer of ethylene and a monomer having a carboxyl group. It is.

The invention according to claim 5 is characterized in that after the anchor coat layer is applied on the surface of the aluminum foil in a range of 1.0 g / m ² or less, a sand resin layer is laminated. It is a laminated body.

  The invention according to claim 6 is the laminate according to any one of claims 1 to 5, wherein the surface treatment applied to the aluminum foil is a hydrothermal modification treatment.

  The invention according to claim 7 is the laminate according to claim 6, wherein the hydrothermal modification treatment is boehmite treatment.

  The invention according to claim 8 is a laminate characterized in that a thermal laminate is applied at or after the step of producing the laminate according to any one of claims 1 to 7.

  The invention according to claim 9 is a packaging material using the laminate according to any one of claims 1 to 8 as a minimum unit.

  A tenth aspect of the invention is a packaging material using the laminate according to any one of the first to eighth aspects as a packaging material for a lithium battery.

  In the laminate of the present invention, a coupling agent or an ionic polymer complex is applied as an anchor coat layer on an aluminum foil subjected to hydrothermal modification treatment, and polypropylene, propylene-α-olefin copolymer, or those The sealant layer is bonded with a sand resin layer of an acid anhydride modified polymer based on the above or a mixture of two or more of them.

  In this way, when acid anhydride-modified polypropylene is used for the sand resin layer and a polypropylene film is used for the sealant layer, the heat resistance is excellent, and the adhesive strength between the aluminum foil and the sealant layer is excellent. Can be obtained. Furthermore, it is possible to obtain a laminate that cannot be peeled off more strongly by thermal lamination.

  The laminated body of the present invention and the packaging material using the same are packaging materials such as bactericides and poultices because of the strong permeable content resistance in addition to the packaging material for lithium batteries, the packaging material for bathing agents, and the lid. It can also be used.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing an example of the configuration of the laminate of the present invention. FIG. 2 is a perspective view showing an example of a battery package using the laminated packaging material of the present invention as a lithium battery exterior material.

  The laminate of the present invention has been made to solve the above problems, and the invention according to claim 1 is at least the outermost layer 11 / the aluminum foil layer 12 / the anchor coat layer 13 / the sand resin layer 14 / the sealant. The laminate 10 is composed of a layer 15 and the aluminum foil layer 12, the anchor coat layer 13, and the sand resin layer 14 are layers as shown below.

The aluminum foil layer 12 is a layer having a thickness of 9 to 200 μm and having a surface treatment applied at least to the sealant layer side.

  The anchor coat layer 13 is a layer made of a coupling agent or an ionic polymer complex.

  The sand resin layer 14 is a layer made of polypropylene, propylene-α-olefin copolymer, polymer modified with acid anhydride based on them, or a thermoplastic resin that is a mixture of two or more of them.

  The aluminum foil layer 12 is used as a barrier layer that blocks moisture from the outside, and in order to improve the adhesion strength (laminate strength) with the resin layer, the surface of the sand resin layer side or both surfaces are subjected to hydrothermal modification. ing.

  As such a hydrothermal conversion treatment method for aluminum foil, known surface treatment techniques such as chromic acid chromate treatment, chemical conversion treatment such as phosphoric acid chromate treatment, and anodizing treatment to form alumite can be used. Boehmite treatment, in which a small amount of alkali such as ammonia or triethanolamine is added to pure water and surface treatment is performed at a temperature of 80 ° C. or higher, is preferably used.

As the treated water used for the boehmite treatment, tap water, deionized water, distilled water, or distilled water distilled after deionization can be used. In particular, deionized distilled water is preferable, and the indicator is electric. It is preferable to use water having a conductivity of 1 μS / cm or less. Moreover, 0.1 to 1% of alkali such as amines such as a small amount of ammonia and triethanolamine is added to these treated waters,
It is better to perform boehmite treatment at 80 to 100 ° C., more preferably 90 to 100 ° C. under normal pressure.

  By applying the hydrothermal modification treatment as described above to the surface of the aluminum foil, it is possible to make the surface rough by roughening the surface, and at the same time, functional groups such as hydroxyl groups can be formed on the surface. . The adhesion strength between the aluminum foil layer and the resin layer can be increased due to the anchoring effect due to the roughness of the surface and the result of hydrogen bonding between the functional group and the sand resin. By improving the adhesion, it is possible to improve the heat seal strength and block moisture from entering between layers.

  As the aluminum foil 12, a material having a thickness in the range of 9 to 200 μm, preferably 15 to 100 μm, can be used in consideration of barrier properties, pinhole resistance, and workability. The material can be a general soft aluminum foil, but for the purpose of imparting further pinhole resistance and extensibility during molding, the iron content is 0.1 to 9.0 wt%, preferably An aluminum foil in the range of 0.5 to 2.0 wt% is preferably used. When the iron content is 0.1 wt% or less, pinhole resistance and spreadability cannot be sufficiently imparted, and when it is 9.0 wt% or more, flexibility is impaired.

  Even if a thermoplastic resin is laminated directly on the aluminum foil that has been subjected to hydrothermal modification treatment using a method such as extrusion lamination, sufficient laminate strength can be obtained, but in order to have resistance to strongly permeable contents, An anchor coat layer can be provided on the aluminum foil by a method such as gravure coating.

A silane coupling agent or an ionic polymer complex is used for the anchor coat layer 13. As the silane coupling agent, those having a functional group capable of reacting with an adhesive resin to be laminated thereon and a site for bonding with a metal such as aluminum in the molecule are used. Examples of such silane coupling agents include γ-isocyanatopropyltriethoxysilane having an isocyanate group, γ-isocyanatopropyltrimethoxysilane, and β- (3,4-epoxycyclohexyl) ethyltrimethoxysilane having an epoxy ring. , Γ-glycidoxypropyltrimethoxysilane, or γ-aminopropyltriethoxysilane having an amino group, N-β- (aminoethyl) -γ-aminopropyltrimethoxysilane, N-β- (aminoethyl)- and γ-aminopropylmethyldimethoxysilane.

  One of the ionic polymer complexes is a chelate complex with a polysaccharide having a polyethyleneimine as a main component and having a carboxyl group. Examples of the polysaccharide include, but are not limited to, starch, cellulose, chitin, pectin, and vegetable gum (eg, gum arabic). Those obtained by derivatizing these polysaccharides with carboxyl groups are used.

  The other is a chelate complex of a copolymer of ethyleneimine as a main component and ethylene and a monomer having a carboxyl group. Typical examples of the monomer having a carboxyl group include acrylic acid such as α, β-unsaturated carboxylic acid, and methacrylic acid. An ionomer obtained by copolymerizing these with ethylene or the like to form an ionomer can also form a chelate complex. Furthermore, fumaric acid, maleic acid and the like can be used by copolymerizing with ethylene, α-olefin and the like.

  Both anchor coating agents are chelate complexes with polyethyleneimine, and are superior in moisture resistance, heat resistance, and content resistance due to improved wetting characteristics with respect to aluminum foil as compared with polyethyleneimine alone.

The anchor coat layer 13 has a coating amount of 1.0 g / m ² or less, preferably 0.5 g / m ² or less. When the coating amount is 1.0 g / m ² or more, cohesive peeling at the anchor coat layer may occur and the laminate strength may be lowered.

  Next, the sand resin layer 14 will be described in detail. As a method for bonding the sealant layer of the packaging material and the aluminum foil layer provided with the anchor coat layer, there is a method using an adhesive such as dry lamination or wet lamination. However, many of the adhesives used in such a method are not resistant to strongly permeable contents. In particular, when contents such as an electrolyte for a lithium battery are added, the adhesive swells and the adhesive is swollen. Lamination occurs.

  Therefore, when the sealant layer 15 and the aluminum foil layer 12 are bonded, extrusion lamination that does not require an adhesive is preferably used. Therefore, as the sand resin, polypropylene, propylene-α-olefin copolymer, polymer modified with acid anhydride based on these, or a mixture of two or more of them is used. In view of improvement of the adhesion and improvement of interlayer adhesion strength with the anchor coat layer 13 applied on the aluminum foil, an acid anhydride-modified polypropylene is preferable. As the base polypropylene, a homotype, a block type, and a random type can be selected without particular limitation.

  The thickness of the sand resin layer 14 is preferably 30 μm or less. If it is thicker than 30 μm, the overall thickness when bonded to the sealant layer is increased, which may cause a sealing failure.

The sealant layer 15 is laminated to heat-seal the laminates when forming the packaging material. As the sealant layer 15, the same type is preferable in consideration of adhesiveness with the sand resin. Furthermore, in consideration of the heat resistance of the packaging material, polypropylene is preferably used, and it may be a single layer or a two-layer structure such as random / homo, or a three-layer structure such as random / homo / random, random / block / random, etc. It doesn't matter.

  The thickness of the sealant layer 15 is preferably in the range of 20 to 100 μm, and preferably in the range of 30 to 70 μm. If the thickness is too thin, the sealing strength is weakened. If the thickness is too thick, the thickness of the entire laminate is increased, so that sealing failure may occur, and moisture may easily enter from the end face of the sealant.

  When the aluminum foil used as the barrier layer becomes the outermost layer, pinholes may be generated during processing, distribution, etc., so that the outermost layer can be provided outside the aluminum foil for the purpose of preventing this. Moreover, when using as an exterior material for lithium batteries, it is also necessary to avoid direct contact between aluminum and hard. In consideration of these points, an insulating resin layer is preferably used as the outermost layer. As an example of such a resin layer, a single layer of a stretched or unstretched film such as a polyester film, a polyamide film, or a polypropylene film, or a multilayer film in which two or more layers are laminated can be used. In order to improve pinhole resistance and insulation, a film having a thickness of 6 μm or more and considering the moldability is preferably a film having a thickness of 40 μm or less, preferably 15 to 25 μm.

  The film of the outermost layer 11 and the aluminum foil layer 12 can be bonded together by a known method such as dry lamination, wet lamination, non-solvent lamination, extrusion lamination.

Furthermore, it is more preferable to perform thermal lamination in order to improve the interlayer adhesion of the laminate. A known laminating technique can be used for the heat laminating method. There are two methods for heat laminating this laminate, but one is a heated roll after producing a laminate comprising the outermost layer / aluminum foil layer / anchor coat layer / sand resin layer / sealant layer. And pressurizing by passing between the press rolls. The other is provided with an anchor coat layer in advance on an aluminum foil layer subjected to hydrothermal modification treatment, and an acid anhydride modified polypropylene solution dispersed in a solvent as a sand resin layer is provided using a method such as gravure coating, In this method, the surface and the sealant layer are overlapped and passed between a heating roll and a press roll to perform heat and pressure treatment, and then provide an outermost layer. The coating amount of the acid anhydride modified polypropylene solution at this time is in the range of 0.5 to 5 g / m ^2, preferably in the range of 1 to 4 g / m ^2.

  Either method may be used for heat laminating, but the heat laminating further improves the adhesion between the aluminum foil and the sealant layer, and remarkably improves the resistance to strongly permeable contents such as the electrolyte of a lithium battery.

The laminate of the present invention can be used as various packaging materials by providing a single layer or an intermediate layer between layers. A configuration example is shown below.
1) thermoplastic resin layer (outermost layer) / thermoplastic resin layer (intermediate layer) / AL / ac / sand / sealant layer 2) thermoplastic resin layer (outermost layer) / paper layer (intermediate layer) / AL / ac / Sand / sealant layer 3) Thermoplastic resin layer (outermost layer) / AL / ac / sand / sealant layer In the above, AL represents an aluminum foil layer, ac represents an anchor coat layer, and sand represents a sand resin layer. The outermost layer and the intermediate layer can be bonded together by a known method such as dry lamination, wet lamination, non-solvent lamination, extrusion lamination.

  It is also possible to use the laminated packaging material of the present invention as an exterior material for a lithium battery. As shown in FIG. 2, it is a perspective view which shows an example of the battery packaging body which used the laminated packaging material of this invention as a lithium battery exterior material. As an example, the battery packaging body 20 is formed by forming the laminated packaging material of the present invention into a container 21 and storing the battery constituent material, and then the electrode terminals 22 and 23 are extended outward from the inside of the packaging body through the opening. The sealing part 24 of the part is sealed by heat sealing.

  In addition, the laminate of the present invention can be used not only for packaging materials for lithium batteries, but also for packaging materials and lid materials for bath agents.

Examples of the present invention will be specifically described below. The present invention is not limited to these examples.
[Materials used]
<Aluminum foil>
AL-1 Boehmite treated AL-2 Untreated <Anchor coating agent>
ac-1 Isocyanate-type silane coupling agent ac-2 Epoxy-type silane coupling agent ac-3 Amine-type silane coupling agent ac-4 Polyethyleneimine / carboxymethylcellulose complex ac-5 Polyethyleneimine / ethylene-acrylic acid copolymer complex <Sand resin>
Sand-1 acid anhydride modified polypropylene (random base melting point 140 ° C. 15 μm) Sand-2 acid anhydride modified polypropylene (homobase melting point 165 ° C. 15 μm)
Sand-3 Solvent-dispersed acid anhydride modified polypropylene solution (3 g / m ² )
<Sealant film (40 μm)>
S-1 Polypropylene three-layer film (random / homo / random)
The evaluation method is shown below.

[Evaluation]
<Evaluation method 1>
A peel test was performed on the samples that were heat-sealed under the conditions of 190 ° C., 3 kg / cm ² , 3 sec, and seal width of 15 mm to measure the heat seal strength.
<Evaluation method 2>
The heat seal strength in a 100 ° C. atmosphere was measured by the same method as in Evaluation Method 1. <Evaluation method 3>
An evaluation sample cut to a width of 15 mm was immersed in an electrolyte solution for lithium battery prepared so that LiPF ₆ was 1.5 N in an ethyl carbonate / ethyl methyl carbonate = 1/1 solution, and the test sample was immersed at 85 ° C. for 2 weeks. After storage, the laminate strength between the aluminum foil layer and the sealant layer and the appearance were evaluated.
<Evaluation method 4>
A bath powder containing a fragrance, which is a highly permeable content, is placed in a three-sided pouch, sealed and sealed, stored at 40 ° C. for one month, and then the laminate strength between the aluminum foil layer and the sealant layer, and Appearance was evaluated.

Example 1 based on this is shown below.
<Example 1>
A biaxially stretched nylon film having a thickness of 25 μm and an aluminum foil AL-1 were bonded together by dry lamination as the outermost layer. Next, a solid content 5 wt% ethyl acetate solution of ac-1 as an anchor coat layer was applied to the AL-1 boehmite-treated surface so that the coating amount after drying was 0.5 g / m ² or less, and sand resin As a result, Sand-1 as a sealant layer was laminated by extrusion lamination. At this time, the thickness of the sand resin layer was 15 μm. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Example 2>
An evaluation sample was prepared in the same manner as in Example 1 except that AL-1 was used for the aluminum foil, ac-2 was used for the anchor coating agent, Sand-2 was used for the sand resin, and Shi-1 was used for the sealant layer. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Example 3>
An evaluation sample was prepared in the same manner as in Example 1 except that AL-1 was used for the aluminum foil, ac-3 for the anchor coating agent, Sand-1 for the sand resin, and Shi-1 for the sealant layer. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Example 4>
AL-1 on aluminum foil, ac-4 on anchor coating agent (solid content 1wt% water-methanol solution, applied so that coating amount after drying is 0.5g / m ² or less), sand resin-sand- 2. An evaluation sample was prepared in the same manner as in Example 1 except that shi-1 was used for the sealant layer. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Example 5>
The laminated body obtained in Example 4 was subjected to thermal lamination by passing between a 200 ° C. heating roll and a press roll to prepare an evaluation sample. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Example 6>
A 5 wt% solid-water solution of ac-5 as an anchor coat layer was applied to the boehmite-treated surface of the aluminum foil AL-1 so that the coating amount after drying was 0.5 g / m ² or less. Next, sand-3 as a sand resin is coated on the coated surface so that the coating amount after drying is 3 g / m ² , superposed with the sealant layer shi-1, and a 200 ° C. heating roll and press roll Thermal lamination was performed by passing in between. Thereafter, a biaxially stretched nylon film having a thickness of 25 μm was bonded as an outermost layer by dry lamination to prepare a sample for evaluation. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative Example 1>
An evaluation sample was prepared in the same manner as in Example 1 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative example 2>
An evaluation sample was prepared in the same manner as in Example 2 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative Example 3>
A sample for evaluation was produced in the same manner as in Example 3 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative example 4>
A sample for evaluation was produced in the same manner as in Example 4 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative Example 5>
A sample for evaluation was produced in the same manner as in Example 5 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

<Comparative Example 6>
An evaluation sample was prepared in the same manner as in Example 6 except that AL-2 was used for the aluminum foil. The evaluation methods 1 to 4 were performed using this evaluation sample. The results are shown in Table 1.

  The table is as follows.

  This is a technology used for a lithium battery used as a battery used in a portable terminal device such as a personal computer or a mobile phone, a video camera, a satellite, or the like.

It is sectional drawing which shows an example of a structure of the laminated body of this invention. It is a perspective view which shows an example of the battery package which used the laminated packaging material of this invention as a lithium battery exterior material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Laminated body 11 ... Outermost layer 12 ... Aluminium foil layer 13 ... Anchor coat layer 14 ... Sand resin layer 15 ... Sealant layer 20 ... Battery packaging body 21 ... Container 22, 23 ... Electrode 24 ... Seal part

Claims (10)

A packaging material comprising at least the outermost layer / aluminum foil layer / anchor coat layer / sand resin layer / sealant layer, wherein the aluminum foil layer, anchor coat layer, and sand resin layer are composed of the following layers, respectively: A laminate characterized by the following.
(1) A layer in which the aluminum foil layer has a thickness of 9 to 200 μm, and at least a surface treatment is performed on the sealant layer side.
(2) The layer in which the anchor coat layer is composed of a coupling agent or an ionic polymer complex.
(3) A layer made of a thermoplastic resin in which the sand resin layer is polypropylene, a propylene-α-olefin copolymer, an acid anhydride-modified polymer based on these, or a mixture of two or more thereof.   The laminate according to claim 1, wherein the coupling agent constituting the anchor coat layer is a silane coupling agent.   2. The laminate according to claim 1, wherein the ionic polymer complex constituting the anchor coat layer is composed of polyethyleneimine and a polysaccharide having a carboxyl group.   2. The laminate according to claim 1, wherein the ionic polymer complex constituting the anchor coat layer is composed of polyethyleneimine and a copolymer of ethylene and a monomer having a carboxyl group. The laminate according to any one of claims 1 to 4, wherein a sand resin layer is laminated after applying the anchor coat layer on the aluminum foil surface in a range of 1.0 g / m ² or less.   6. The laminate according to claim 1, wherein the surface treatment applied to the aluminum foil is a hydrothermal modification treatment.   The laminate according to claim 6, wherein the hydrothermal modification treatment is boehmite treatment.   A laminate having a heat laminate applied at or after the production of the laminate according to any one of claims 1 to 7.   A packaging material using the laminate according to any one of claims 1 to 8 as a minimum unit.   A packaging material comprising the laminate according to any one of claims 1 to 8 as a packaging material for a lithium battery.

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