JP7410787B2 - Adhesives for non-aqueous batteries and adhesive tapes for non-aqueous batteries - Google Patents

Description

The present invention relates to an adhesive for non-aqueous batteries and an adhesive tape for non-aqueous batteries.

Adhesive tape is used in non-aqueous batteries such as lithium-ion batteries, which are made by enclosing a non-aqueous electrolyte, to improve the packing of electrodes into the battery case and to prevent short circuits between electrodes. be done. Adhesion reliability in non-aqueous electrolytes is required for such adhesive tapes, and it is recommended to use highly hydrophobic adhesives (acrylic adhesives, rubber adhesives), or to add acid components to the adhesive. , measures such as adding additives such as tackifier resin to the adhesive are being considered (for example, Patent Document 1).

However, adhesives designed to improve adhesion reliability in non-aqueous electrolytes are generally soft and may cause problems during the battery assembly process due to stickiness of the adhesive or extrusion of the adhesive from the end surface of the adhesive tape. This is one of the causes of poor handling. To prevent such problems, measures such as increasing the degree of crosslinking of the base polymer constituting the adhesive, reducing the thickness of the adhesive layer, and reducing the amount of additives such as tackifier resin are available. Conceivable. However, all of these measures reduce the adhesion reliability in a non-aqueous electrolyte. That is, there is a trade-off relationship between ensuring adhesion reliability in a non-aqueous electrolyte and improving handling properties in the battery assembly process.

Japanese Patent Application Publication No. 2013-140765

The present invention was made to solve the conventional problems, and its purpose is to provide a tape that has excellent adhesion in a non-aqueous electrolyte, has little stickiness, and is suitable for adhesive tapes when applied to adhesive tapes. An object of the present invention is to provide a non-aqueous battery adhesive that can be prevented from protruding from the end surface of the adhesive tape, and an adhesive tape containing the adhesive.

The adhesive for nonaqueous batteries of the present invention is an adhesive that exhibits adhesive properties by pressure bonding, and includes an acrylic polymer having an acid functional group and a crystalline resin having a melting point of 25° C. or higher.
In one embodiment, the non-aqueous battery adhesive exhibits adhesive properties when heated.
In one embodiment, the acrylic polymer having an acid functional group has a structural unit a derived from a (meth)acrylic acid alkyl ester having a linear or branched alkyl group having 4 or more carbon atoms. .
In one embodiment, the content of the structural unit a is 50 parts by weight or more based on 100 parts by weight of the acrylic polymer having an acid functional group.
In one embodiment, the crystalline resin is a polyolefin resin.
In one embodiment, the polyolefin resin is a maleic anhydride-modified polyolefin resin, a maleic acid-modified polyolefin resin, or an acrylic-modified polyolefin resin.
In one embodiment, the nonaqueous battery adhesive contains a C5 petroleum resin and/or a C9 petroleum resin.
According to another aspect of the present invention, an adhesive tape for non-aqueous batteries is provided. This adhesive tape for non-aqueous batteries contains the above adhesive for non-aqueous batteries.
In one embodiment, the adhesive tape for non-aqueous batteries includes a base material and an adhesive layer disposed on at least one side of the base material, and the adhesive layer includes the adhesive tape for non-aqueous batteries. including.
In one embodiment, the base material is selected from polyacrylate, polyurethane, polyimide, aramid, polyamide, ethylene/vinyl alcohol copolymer, polyetherimide, polyvinylidene fluoride, polyester, polypropylene, polyethylene, polyphenylene sulfide. It is formed from at least one kind of material.
In one embodiment, a release film is provided on the side of the pressure-sensitive adhesive layer opposite to the base material.
In one embodiment, the adhesive layer is disposed on one side of the substrate and another adhesive layer is disposed on the other side of the substrate.
According to yet another aspect of the invention, a non-aqueous battery is provided. This non-aqueous battery includes the above adhesive tape for non-aqueous batteries.

According to the present invention, a non-aqueous battery adhesive has excellent adhesive properties in a non-aqueous electrolyte, has little stickiness, and can prevent protrusion from the end surface of the adhesive tape when applied to an adhesive tape. And an adhesive tape containing the adhesive can be provided.

1 is a schematic cross-sectional view of an adhesive tape for non-aqueous batteries according to one embodiment of the present invention. It is a schematic sectional view of the adhesive tape for non-aqueous batteries according to another embodiment of the present invention.

A. Adhesive for non-aqueous batteries The adhesive for non-aqueous batteries of the present invention is an adhesive that exhibits adhesive properties by pressure bonding, and is composed of an acrylic polymer having an acid functional group and a crystalline resin having a melting point of 25°C or higher. including. In the present invention, by using a combination of an acrylic polymer having an acid functional group and the above-mentioned crystalline resin, it is possible to reduce stickiness (specifically, to have an appropriate probe tack value) and It is possible to obtain a pressure-sensitive adhesive that exhibits excellent adhesiveness even in liquid and whose adhesiveness does not easily deteriorate over time. By using such an adhesive, it is possible to obtain an adhesive tape that has excellent internal short-circuit prevention functionality and excellent handling properties in the battery assembly process. Further, the above-mentioned adhesive tape can be suitably used for joining members used in a non-aqueous electrolytic solution (for example, separators, electrodes, exterior materials (metal cans, pouches, etc.). The pressure-sensitive adhesive of the present invention can be suitably used for bonding metal materials to metal materials, non-metal materials to non-metal materials, and metal materials to non-metal materials. By adjusting the structure of the acrylic polymer having acid functional groups (e.g. monomer components, molecular weight), the structure of the crystalline resin, the content ratio of the acrylic polymer having acid functional groups and the crystalline resin, etc., the stickiness can be reduced. The balance between strength and adhesion reliability can be easily controlled.

The above-mentioned adhesive may be an adhesive that exhibits adhesive properties at room temperature (25°C), or may be an adhesive that exhibits adhesive properties when heated (eg, 100°C to 200°C). A pressure-sensitive adhesive that exhibits adhesive properties when heated can exhibit adhesive properties when cooled to room temperature after heating.

A-1. Acrylic polymers having acid functional groups Examples of acrylic polymers having acid functional groups include structural units derived from one or more types of (meth)acrylic acid alkyl esters, and structural units derived from monomers having acid functional groups. Examples include acrylic polymers containing structural units.

In the above adhesive, the content of the acrylic polymer having an acid functional group is preferably 7 parts by weight to 95 parts by weight, more preferably 15 parts by weight to 100 parts by weight of the solid content in the adhesive. The amount is 90 parts by weight, more preferably 20 to 85 parts by weight, particularly preferably 40 to 85 parts by weight. The content of the acrylic polymer having an acid functional group can be set to an appropriate amount depending on the desired probe tack value, adhesiveness, etc. In addition, the above-mentioned adhesive may contain an acrylic polymer that does not have an acid functional group in addition to the acrylic polymer that has an acid functional group, and does not contain an acrylic polymer that does not have an acid functional group. It's okay.

The content ratio of the structural unit derived from the (meth)acrylic acid alkyl ester is preferably 50 parts by weight to 99 parts by weight, more preferably 70 parts by weight, based on 100 parts by weight of the acrylic polymer having an acid functional group. The amount is preferably 80 to 98 parts by weight, more preferably 80 to 98 parts by weight.

Preferably, the (meth)acrylic acid alkyl ester is a linear or branched alkyl ester having 1 to 24 carbon atoms (more preferably 3 to 20 carbon atoms, even more preferably 4 to 12 carbon atoms, particularly preferably 4 to 8 carbon atoms). It has an alkyl group.

Examples of the (meth)acrylic acid alkyl esters include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, butyl (meth)acrylate, pentyl (meth)acrylate, and (meth)acrylate. ) Hexyl acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, nonyl (meth)acrylate, decyl (meth)acrylate, eicosyl (meth)acrylate, and the like.

In one embodiment, the acrylic polymer having an acid functional group has a linear or branched alkyl group having 4 or more carbon atoms (preferably 4 to 12, more preferably 4 to 8). It has a structural unit a derived from (meth)acrylic acid alkyl ester, and the content of the structural unit a is 50 parts by weight or more (preferably 50 parts by weight) per 100 parts by weight of the acrylic polymer having an acid functional group. 99 parts by weight, more preferably 70 parts by weight to 98 parts by weight, even more preferably 80 parts by weight to 98 parts by weight). By using an acrylic polymer having an acid functional group containing a predetermined amount or more of the structural unit a, it is possible to obtain a pressure-sensitive adhesive having excellent adhesion reliability in a non-aqueous electrolyte.

In one embodiment, an alkyl (meth)acrylate having a branched alkyl group is used as the alkyl (meth)acrylate. If a (meth)acrylic acid alkyl ester having a branched alkyl group is used, the effects of the present invention will be particularly remarkable. The number of carbon atoms in the branched alkyl group is preferably 4 or more, more preferably 4 to 12, and still more preferably 4 to 8. A (meth)acrylic acid alkyl ester having a linear alkyl group and a (meth)acrylic acid alkyl ester having a branched alkyl group may be used together. Further, as the (meth)acrylic acid alkyl ester, a (meth)acrylic acid alkyl ester having a branched alkyl group may be used alone.

In one embodiment, in the acrylic polymer having an acid functional group, the content ratio of structural units derived from an alkyl (meth)acrylate having a branched alkyl group is equal to For 100 parts by weight of units (i.e., 100 parts by weight of the total amount of (meth)acrylic acid alkyl ester having a linear alkyl group and (meth)acrylic acid alkyl ester having a branched alkyl group), preferably The amount is from 50 parts by weight to 100 parts by weight, more preferably from 70 parts by weight to 100 parts by weight, and even more preferably from 80 parts by weight to 100 parts by weight.

Examples of the (meth)acrylic acid alkyl ester having a branched alkyl group include isobutyl (meth)acrylate, sec-butyl (meth)acrylate, t-butyl (meth)acrylate, and 2-(meth)acrylate. Examples include ethylhexyl, isooctyl (meth)acrylate, isononyl (meth)acrylate, isodecyl (meth)acrylate, 2-ethylbutyl (meth)acrylate, and 2-methylbutyl (meth)acrylate. Among these, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, or isodecyl (meth)acrylate is preferred, and 2-ethylhexyl (meth)acrylate is more preferred. . By using 2-ethylhexyl (meth)acrylate, it is possible to obtain an adhesive that has particularly excellent adhesive reliability in a non-aqueous electrolyte.

Examples of the acid functional group contained in the acrylic polymer having an acid functional group include a carboxyl group, an acid anhydride group, a phosphoric acid group, and a sulfonic acid group. Therefore, examples of the monomer having an acid functional group include carboxyl group-containing monomers, acid anhydride group-containing monomers, phosphoric acid group-containing monomers, sulfonic acid group-containing monomers, and the like. Among these, carboxyl group-containing monomers are preferred. If a carboxyl group-containing monomer is used, it is easy to develop adhesive strength to metal plates, and in terms of design and production, it is also easy to copolymerize with other acrylic monomers, and the polymer made by copolymerization is difficult to cross-link. It has the characteristic of being easy.

Examples of the carboxyl group-containing monomer include (meth)acrylic acid, carboxyethyl acrylate, carboxypentyl acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid. Among them, acrylic acid is preferred.

The content ratio of the structural unit derived from the monomer having an acid functional group is preferably 1.5 parts by weight to 20 parts by weight, more preferably 1.5 parts by weight to 100 parts by weight of the acrylic polymer having an acid functional group. The amount is 8 parts by weight to 15 parts by weight, more preferably 2 parts by weight to 10 parts by weight.

The above-mentioned acrylic polymer having an acid functional group may be combined with the above-mentioned (meth)acrylic acid alkyl ester and/or a monomer having an acid functional group, as necessary, for the purpose of modifying the cohesive strength, heat resistance, crosslinking property, etc. It may also contain structural units derived from other copolymerizable monomers. Examples of such other monomers include hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate, hydroxybutyl (meth)acrylate, hydroxyhexyl (meth)acrylate, hydroxyoctyl (meth)acrylate, Hydroxyl group-containing monomers such as hydroxydecyl (meth)acrylate, hydroxylauryl (meth)acrylate, (4-hydroxymethylcyclohexyl)methyl methacrylate; (meth)acrylamide, N,N-dimethyl (meth)acrylamide, N-butyl (N-substituted)amide monomers such as (meth)acrylamide, N-methylol (meth)acrylamide, N-methylolpropane (meth)acrylamide; aminoethyl (meth)acrylate, N,N-dimethyl (meth)acrylate Aminoalkyl (meth)acrylate monomers such as aminoethyl and t-butylaminoethyl (meth)acrylate; alkoxyalkyl (meth)acrylate monomers such as methoxyethyl (meth)acrylate and ethoxyethyl (meth)acrylate Monomers: Maleimide monomers such as N-cyclohexylmaleimide, N-isopropylmaleimide, N-laurylmaleimide, N-phenylmaleimide; N-methylitaconimide, N-ethylitaconimide, N-butylitaconimide, N-octylitaconimide , N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, N-laurylitaconimide, and other itaconimide monomers; N-(meth)acryloyloxymethylene succinimide, N-(meth)acryloyl-6-oxyhexamethylene succinimide, Succinimide monomers such as N-(meth)acryloyl-8-oxyoctamethylene succinimide; vinyl acetate, vinyl propionate, N-vinylpyrrolidone, methylvinylpyrrolidone, vinylpyridine, vinylpiperidone, vinylpyrimidine, vinylpiperazine, vinylpyrazine, vinyl Vinyl monomers such as pyrrole, vinylimidazole, vinyloxazole, vinylmorpholine, N-vinylcarboxylic acid amides, styrene, α-methylstyrene, and N-vinylcaprolactam; Cyanoacrylate monomers such as acrylonitrile and methacrylonitrile; (meth) Epoxy group-containing acrylic monomers such as glycidyl acrylate; glycol-based acrylics such as polyethylene glycol (meth)acrylate, polypropylene glycol (meth)acrylate, methoxyethylene glycol (meth)acrylate, and methoxypolypropylene glycol (meth)acrylate Ester monomer; Acrylic acid ester monomer having a heterocycle such as tetrahydrofurfuryl (meth)acrylate, fluorine (meth)acrylate, silicone (meth)acrylate, halogen atom, silicon atom, etc.; hexanediol di(meth)acrylate, (Poly)ethylene glycol di(meth)acrylate, (poly)propylene glycol di(meth)acrylate, neopentyl glycol di(meth)acrylate, pentaerythritol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol Examples include polyfunctional monomers such as tri(meth)acrylate, dipentaerythritol hexa(meth)acrylate, epoxy acrylate, polyester acrylate, and urethane acrylate; olefin monomers such as isoprene, butadiene, and isobutylene; vinyl ether monomers such as vinyl ether, etc. . These monomer components may be used alone or in combination of two or more.

The content of the structural units derived from the other monomers is preferably 20 parts by weight or less, more preferably 10 parts by weight or less, and even more preferably It is 5 parts by weight or less.

The weight average molecular weight of the acrylic polymer having an acid functional group is preferably 300,000 to 2,000,000, more preferably 500,000 to 1,500,000. The weight average molecular weight can be measured by GPC (solvent: THF).

A-2. Crystalline Resin As mentioned above, the adhesive of the present invention contains a crystalline resin. The term "crystalline resin" refers to a resin that has a clear endothermic peak (width at half maximum of 15° C. or less) in a differential calorific value curve measured with a differential scanning calorimeter (DSC).

In the adhesive, the content ratio of the crystalline resin is preferably 3 parts by weight to 90 parts by weight, more preferably 10 parts by weight to 85 parts by weight, based on 100 parts by weight of solid content in the adhesive. More preferably, it is 15 parts by weight to 80 parts by weight.

The melting point of the crystalline resin is 25°C or higher, more preferably 40°C or higher, even more preferably 60°C to 120°C, particularly preferably 60°C to 100°C. Within this range, a pressure-sensitive adhesive with less stickiness can be obtained. Melting point can be measured by differential scanning calorimetry (DSC).

The weight average molecular weight of the crystalline resin is preferably 50,000 to 1,500,000, more preferably 70,000 to 1,000,000.

The crystallinity of the crystalline resin is preferably 10% or more, more preferably 20% or more. Crystallinity can typically be measured by differential scanning calorimetry (DSC).

In one embodiment, the crystalline resin is a polyolefin resin. Examples of the polyolefin resin include ethylene homopolymer, ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-1-hexene copolymer, ethylene-1-octene copolymer, and ethylene-1-butene copolymer. 1-heptene copolymer, ethylene-1-octene copolymer, ethylene-1-nonene copolymer, ethylene-1-decene copolymer, ethylene-1-undecene copolymer, ethylene-1-dodecene copolymer Polymer, ethylene-1-tridecene copolymer, ethylene-1-tetradecene copolymer, ethylene-1-pentadecene copolymer, ethylene-1-hexadecene copolymer, ethylene-1-heptadecene copolymer, ethylene- Ethylene-α-olefin copolymers such as 1-octadecene copolymer, ethylene-1-nanodecene copolymer, ethylene-1-eicosene copolymer; ethylene-vinyl acetate copolymer, ethylene-vinyl propionate copolymer Ethylene-vinyl ester copolymers such as ethylene-vinyl ester copolymers; ethylene-methyl methacrylate copolymers, ethylene-methyl acrylate copolymers, ethylene-ethyl acrylate copolymers, ethylene-butyl acrylate copolymers, etc. Examples include unsaturated carboxylic acid alkyl ester copolymers; propylene resins and the like.

In one embodiment, a crystalline polypropylene resin is used as the crystalline resin. The crystalline polypropylene resin may be a homopolymer or a copolymer obtained from propylene and a monomer copolymerizable with propylene. Examples of monomers copolymerizable with propylene include ethylene, 1-butene, 1-pentene, 1-hexene, 1-octene, 1-decene, 4-methyl-1-pentene, 3-methyl-1-pentene, etc. and α-olefins. In the crystalline polypropylene resin, the content of propylene-derived structural units is preferably 60 mol% to 99 mol%, more preferably 65 mol% to 99 mol%, and even more preferably 70 mol% to 99 mol%. It is. In the crystalline polypropylene resin, the content of α-olefin-derived structural units is preferably 1 mol% to 15 mol%, more preferably 1 mol% to 10 mol%.

In one embodiment, a modified polyolefin resin is used as the crystalline resin. By using a modified polyolefin resin, phase separation between a crystalline resin and an acrylic polymer having an acid functional group can be suppressed, and an adhesive that can form an adhesive layer with less bleeding and excellent transparency can be obtained. I can do it. As the modified polyolefin resin, maleic anhydride modified polyolefin resin, maleic acid modified polyolefin resin, acrylic modified polyolefin resin, etc. can be preferably used. Specifically, resins obtained by modifying the above-mentioned polyolefin resins with maleic anhydride, maleic acid, or acrylic acid may be mentioned. Among these, maleic anhydride polyolefin resins are preferred, and maleic anhydride-modified propylene resins are more preferred. Specific examples of maleic anhydride-modified propylene resins include resins obtained by modifying the above-mentioned crystalline polypropylene resins with maleic anhydride. The modification rate of the modified polyolefin resin is preferably 1% to 5% by weight, more preferably 1.5% to 2% by weight.

A-3. Additives The above-mentioned pressure-sensitive adhesive may contain any suitable additives, if necessary. The additives include, for example, crosslinking agents, tackifiers, plasticizers (e.g., trimellitic acid ester plasticizers, pyromellitic acid ester plasticizers), pigments, dyes, fillers, anti-aging agents, and conductive materials. , ultraviolet absorbers, light stabilizers, release modifiers, softeners, surfactants, flame retardants, antioxidants, solvents, and the like. Moreover, the above-mentioned pressure-sensitive adhesive may contain any suitable solvent.

Any suitable tackifier can be used as the tackifier. As the tackifier, for example, a tackifier resin is used. Specific examples of tackifier resins include rosin-based tackifier resins (e.g., unmodified rosin, modified rosin, rosin phenol resin, rosin ester resin, etc.), terpene-based tackifier resins (e.g., terpene resin, terpene phenol, etc.) (e.g., aliphatic hydrocarbon resins, aliphatic cyclic hydrocarbon resins, aromatic Hydrocarbon resins (e.g. styrene resins, xylene resins, etc.), aliphatic/aromatic petroleum resins, aliphatic/alicyclic petroleum resins, hydrogenated hydrocarbon resins, coumaron resins, coumaron indene resins ), phenolic tackifier resins (e.g., alkylphenol resins, xylene formaldehyde resins, resols, novolacs, etc.), ketone tackifier resins, polyamide tackifier resins, epoxy tackifier resins, elastomer tackifier resins, etc. can be mentioned.

In one embodiment, the pressure-sensitive adhesive uses a C5 petroleum resin and/or a C9 petroleum resin as a tackifier. If these tackifiers are used, a pressure-sensitive adhesive with highly reliable adhesive strength in a non-aqueous electrolyte can be obtained.

The softening point of the tackifier is preferably 70°C to 200°C, more preferably 80°C to 190°C. Within this range, it is possible to obtain an adhesive layer with appropriately adjusted storage modulus and loss modulus.

The content of the tackifier is preferably 5 parts by weight to 50 parts by weight based on 100 parts by weight of the total amount of the acrylic polymer having an acid functional group and the crystalline resin having a melting point of 25°C or higher. , more preferably 10 parts by weight to 40 parts by weight.

Examples of the crosslinking agents include isocyanate crosslinking agents, epoxy crosslinking agents, melamine crosslinking agents, peroxide crosslinking agents, urea crosslinking agents, metal alkoxide crosslinking agents, metal chelate crosslinking agents, metal Examples include salt crosslinking agents, carbodiimide crosslinking agents, oxazoline crosslinking agents, aziridine crosslinking agents, and amine crosslinking agents. Among these, preferred are isocyanate crosslinking agents, epoxy crosslinking agents, and metal chelate crosslinking agents.

Specific examples of the isocyanate crosslinking agents include lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate; 2,4- Aromatic isocyanates such as tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate, xylylene diisocyanate; trimethylolpropane/tolylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name "Coronate L"), Methylolpropane/hexamethylene diisocyanate trimer adduct (manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name "Coronate HL"), isocyanurate of hexamethylene diisocyanate (manufactured by Nippon Polyurethane Kogyo Co., Ltd., trade name "Coronate HX"), etc. Isocyanate adducts; and the like. The content of the isocyanate crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus, and the content of the isocyanate crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus. The amount is typically 0.1 parts by weight to 20 parts by weight, more preferably 0.5 parts by weight to 10 parts by weight, based on 100 parts by weight of the total amount.

Examples of the epoxy crosslinking agent include N,N,N',N'-tetraglycidyl-m-xylene diamine, diglycidylaniline, 1,3-bis(N,N-glycidylaminomethyl)cyclohexane (Mitsubishi Gas 1,6-hexanediol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name "Epolite 1600"), neopentyl glycol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name "Tetrad C"), ``Epolite 1500NP''), ethylene glycol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name ``Epolite 40E''), propylene glycol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name ``Epolite 70P''), polyethylene glycol diglycidyl ether (manufactured by Kyoeisha Chemical Co., Ltd., trade name ``Epolite 70P''), Polypropylene glycol diglycidyl ether (manufactured by Nippon Oil & Fats Co., Ltd., trade name "Epiol E-400"), sorbitol polyglycidyl ether (manufactured by Nagase ChemteX, trade name "Denacol") EX-611"), glycerol polyglycidyl ether (manufactured by Nagase ChemteX, trade name "Denacol EX-314"), pentaerythritol polyglycidyl ether, polyglycerol polyglycidyl ether (manufactured by Nagase ChemteX, trade name "Denacol EX-314"), -512''), sorbitan polyglycidyl ether, trimethylolpropane polyglycidyl ether, adipic acid diglycidyl ester, o-phthalic acid diglycidyl ester, triglycidyl-tris(2-hydroxyethyl) isocyanurate, resorcin diglycidyl ether, bisphenol -S-diglycidyl ether, epoxy resins having two or more epoxy groups in the molecule, and the like. The content of the epoxy crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus, and the content of the epoxy crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus. The amount is typically 0.01 parts by weight to 10 parts by weight, more preferably 0.03 parts by weight to 5 parts by weight, based on 100 parts by weight of the total amount.

As the metal chelate crosslinking agent, for example, a metal chelate compound in which the metal atom is aluminum, zirconium, titanium, zinc, iron, tin, etc. can be used. Among these, aluminum chelate compounds or titanium chelate compounds are preferred.

Examples of aluminum chelate compounds include diisopropoxyaluminum monooleylacetoacetate, monoisopropoxyaluminum bisoleylacetoacetate, monoisopropoxyaluminum monooleate monoethylacetoacetate, diisopropoxyaluminum monolauryl acetoacetate, diisopropoxy Aluminum monostearylacetoacetate, diisopropoxyaluminum monoisostearylacetoacetate, monoisopropoxyaluminum mono-N-lauroyl-β-alanate monolauryl acetoacetate, aluminum tris(acetylacetonate), acetylacetonate aluminum bis(ethyl) monoacetylacetonate aluminum bis(isobutylacetoacetate) chelate, monoacetylacetonate aluminum bis(2-ethylhexylacetoacetate) chelate, monoacetylacetonate aluminum bis(dodecylacetoacetate) chelate, monoacetylacetonate aluminum bis(dodecylacetoacetate) chelate Examples include bis(oleylacetoacetate) chelate.

Examples of titanium chelate compounds include titanium diisopropoxy bis(acetylacetonate), titanium tetra-n-butyrate, titanium tetra-2-ethylhexanonate, titanium tetraacetylacetonate, titanium diisopropoxy bis(ethyl acetonate) acetate), titanium octylene glycolate, etc.

Other metal chelate compounds include zirconium tetraacetylacetonate, zirconium tributoxy monoacetylacetonate, and the like.

The above metal chelate crosslinking agents may be used alone or in combination of two or more.

The content of the metal chelate crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus, and the content of the metal chelate crosslinking agent can be set to any appropriate amount depending on the desired adhesive strength and elastic modulus. It is typically 0.01 parts by weight to 10 parts by weight, more preferably 0.03 parts by weight to 7 parts by weight, and even more preferably 0.05 parts by weight, relative to 100 parts by weight in total with the resin. parts to 5 parts by weight.

B. Adhesive tape for non-aqueous batteries FIG. 1 is a schematic cross-sectional view of an adhesive tape for non-aqueous batteries (hereinafter also simply referred to as adhesive tape) according to one embodiment of the present invention. The adhesive tape 100 includes a base material 10 and an adhesive layer 20 disposed on at least one side (both sides in the illustrated example) of the base material 10. The adhesive layer 20 contains the adhesive described in Section A above. Although not shown, the above-mentioned adhesive tape has a release film on the outside of the adhesive layer (i.e., the side opposite to the base material of the adhesive layer) in order to protect the adhesive surface until it is ready for use. may be provided.

FIG. 2 is a schematic cross-sectional view of an adhesive tape for non-aqueous batteries according to another embodiment of the present invention. Adhesive tape 200 includes a base material 10, an adhesive layer 20 disposed on one surface of the base material 10, and another adhesive layer 30 disposed on the other surface of the base material. The adhesive layer 20 contains the adhesive described in Section A above. Another adhesive layer 30 includes any suitable adhesive other than the adhesive described in Section A (eg, acrylic adhesive, rubber adhesive). Although not shown, the adhesive tape is attached to the outside of the adhesive layer and/or another adhesive layer (i.e., the outside of the adhesive layer and/or another adhesive layer) for the purpose of protecting the adhesive surface until it is used. A release film may be provided on the surface of the adhesive layer opposite to the base material.

The above-mentioned adhesive tape may be an adhesive tape that exhibits adhesiveness at room temperature (25° C.), or may be an adhesive tape that exhibits adhesiveness when heated. Adhesive tapes that exhibit adhesive properties when heated can exhibit adhesive properties when cooled to room temperature after heating.

The adhesive force at 25°C when the adhesive layer of the adhesive tape of the present invention is attached to aluminum foil is preferably 0.5 N/10 mm or more, more preferably 0.8 N/10 mm to 20 N/10 mm. , more preferably 1N/10mm to 10N/10mm. Within this range, the adhesive tape can be suitable for non-aqueous batteries. In this specification, the adhesive strength is the adhesive strength measured by a method according to JIS Z 0237:2000, and the adhesive tape was attached to aluminum foil by one round trip of a 2 kg roller and left at 25°C for 30 minutes. After that, the adhesive tape is peeled off and measured at a peeling angle of 180° and a peeling speed (pulling speed) of 300 mm/min. In addition, when the adhesive tape is an adhesive tape that develops adhesive properties when heated, it can be bonded to the adhesive tape by an adhesive operation (for example, 130°C, 0.4 MPa, 5 seconds) at a temperature where the adhesive tape exhibits adhesive properties. The adhesive force measured after adhering aluminum foil and cooling to 25° C. corresponds to the adhesive force described above.

The thickness of the adhesive tape is preferably 5 μm to 200 μm, more preferably 15 μm to 150 μm, and still more preferably 30 μm to 100 μm.

B-1. Adhesive Layer The adhesive layer contains the adhesive described in Section A above.

The thickness of the adhesive layer is preferably 1 μm to 100 μm, more preferably 3 μm to 80 μm, and even more preferably 5 μm to 50 μm.

The probe tack value of the pressure-sensitive adhesive layer at 25° C. is preferably 500 g or less, more preferably 400 g or less, even more preferably 340 g or less, particularly preferably 10 g to 300 g. The method for measuring the probe tack value will be described later.

B-2. Base material A resin film is preferably used as the base material. Examples of the resin constituting the resin film include polyacrylate, polyurethane, polyimide, aramid, polyamide, ethylene/vinyl alcohol copolymer, polyetherimide, polyvinylidene fluoride, polyester, polypropylene, polyethylene, polyphenylene sulfide, etc. . These resins may be used alone or in combination of two or more.

The thickness of the base material is preferably 1 μm to 100 μm, more preferably 5 μm to 100 μm, more preferably 10 μm to 70 μm, and even more preferably 15 μm to 50 μm.

In one embodiment, a non-aqueous battery including the above adhesive tape for non-aqueous batteries is provided. Adhesive tapes for non-aqueous batteries can be used, for example, to improve the ease of packing electrodes into a battery case, to prevent short circuits between electrodes, and the like.

EXAMPLES Hereinafter, the present invention will be specifically explained with reference to Examples, but the present invention is not limited to these Examples. The evaluation method in Examples is as follows. In addition, in the examples, unless otherwise specified, "parts" and "%" are based on weight.

(1) Adhesive strength Test specimens were obtained by laminating the adhesive tapes obtained in Examples and Comparative Examples on the surface of aluminum foil under the following conditions. Note that the adhesive tapes of Example 10, Example 11, Example 13, Example 14, Comparative Example 6, and Comparative Example 7 are thermally bonded adhesive tapes, so they are bonded only by heating (130°C). The other adhesive tapes were crimped at room temperature (25°C) and heated (130°C).
For the obtained test specimen, the force (N/10 mm) required to peel the adhesive tape from the aluminum foil surface was measured using a precision universal testing machine (trade name "Autograph AG-I", manufactured by Shimadzu Corporation). The adhesive strength of the adhesive tape was measured under the following conditions.
(Crimp conditions)
Room temperature crimping: crimping with one round trip of a 2 kg roller.
Heated pressure bonding: Pressure bonding was performed at 0.4 MPa x 5 seconds with the surface temperature of the bonding device set at 130°C.
(Peeling conditions)
Temperature: normal temperature (25℃)
Peeling speed: 300mm/min
Peeling angle: 180°

(2) Adhesive strength in non-aqueous electrolyte The test specimen prepared in (1) above was prepared using ethylene carbonate and diethyl carbonate in a volume ratio (ethylene The adhesive tape was immersed in an electrolytic solution obtained by mixing carbonate:diethyl carbonate at a ratio of 1:2 at 80° C. for 72 hours, and visually observed for any lifting or peeling of the adhesive tape. After that, the test specimen from which the adhesive tape did not peel off was removed from the electrolyte, washed with ethanol, and the force required to peel the adhesive tape from the aluminum foil surface (N/10 mm) was applied using the same method as in (1) above. was measured and used as the adhesive strength in a non-aqueous electrolyte.

(3) Probe tack value The probe tack value was measured on the surface of the adhesive layer by the probe tack method. Note that the probe tack value was measured using a tacking tester (manufactured by Resca) under the following conditions.
(Measurement condition)
Temperature: 25℃
Probe material: SUS
Probe shape: Cylindrical (5mmφ)
Pressurization (compression) speed: 30mm/min
Measurement (detachment) speed: 30mm/min
Preload: 100gf
Pressurization (compression) time: 1 second

(4) Haze value The haze value of the adhesive tape was measured using a haze meter (model number: HM-150, manufactured by Murakami Color Research Institute) by entering incident light from the adhesive layer side.

(5) Adhesive extrusion test A 10 mm square piece of adhesive tape was cut out onto a SUS board under the same conditions as in (1) above.
Thereafter, the tape was pressurized under the following conditions, and the amount of adhesive protruding from the end surface of the tape was evaluated.
Pressurizing conditions: 0.4 MPa x 6 hours at a setting where the surface temperature of the heat press device is 130°C.

[Example 1]
2-ethylhexyl acrylate/acrylic acid (95 parts by weight/5 parts by weight) and 0.2 parts by weight of benzoyl peroxide as an initiator were placed in a four-necked flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser. , 120 parts by weight of ethyl acetate was charged, nitrogen gas was introduced while stirring gently, and the polymerization reaction was carried out for about 6 hours while maintaining the liquid temperature in the flask at around 60°C, resulting in an acrylic copolymer with a weight average molecular weight of 1.3 million. Coalescence (1) was obtained.
To 75 parts by weight of the acrylic copolymer (1), as a modified olefin resin, a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight 7. 50,000, melting point 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, and diluted with toluene to prepare an adhesive (1) with a solid content of 15%. did.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (1) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 2]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 75 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight 7) was added as a modified olefin resin. 50,000, melting point: 70°C) 25 parts by weight, hydrogenated derivative of C9 petroleum resin (manufactured by Arakawa Chemical Co., Ltd., trade name "Alcon P-125", hydrogenation rate: 95%, softening point: 125°C) 30 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, and the mixture was diluted with toluene to prepare an adhesive (2) having a solid content of 15%.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (2) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 3]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 75 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-T", weight average molecular weight: 7) was added as a modified olefin resin. 50,000, melting point: 90°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (3). was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 15 μm. , an adhesive tape (3) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 4]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 85 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-T", weight average molecular weight: 7) was added as a modified olefin resin. 50,000, melting point: 90°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (4). was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 5 μm. , an adhesive tape (4) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 5]
Example 4 was carried out in the same manner as in Example 4, except that a 6 μm thick polyester film (manufactured by DuPont Hongji Films Foshan Co. Ltd., trade name “KLBD”) was used as the base material, and the thickness of the adhesive layer was 3 μm. , an adhesive tape (5) was produced.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 6]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 75 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-Lz", weight average molecular weight: 10) was added as a modified olefin resin. 25 parts by weight of 10,000 yen, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were diluted with toluene to prepare an adhesive (5) with a solid content of 15%. did.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (6) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 7]
2-ethylhexyl acrylate/acrylic acid (90 parts by weight/10 parts by weight) and 0.2 parts by weight of benzoyl peroxide as an initiator were placed in a four-necked flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser. , 120 parts by weight of ethyl acetate was charged, nitrogen gas was introduced while stirring gently, and the polymerization reaction was carried out for about 6 hours while maintaining the liquid temperature in the flask at around 60°C, resulting in an acrylic copolymer with a weight average molecular weight of 1.2 million Coalescence (2) was obtained.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added to 85 parts by weight of the acrylic copolymer (2) as a modified olefin resin. 50,000, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (6) was prepared.
The obtained adhesive was applied onto a base material (polyimide film, manufactured by Toray Industries, Inc., trade name "Kapton 100H", thickness: 25 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (7) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 8]
2-ethylhexyl acrylate/acrylic acid (100 parts by weight/2 parts by weight) and 0.2 parts by weight of benzoyl peroxide as an initiator were placed in a four-necked flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser. , 230 parts by weight of ethyl acetate was charged, nitrogen gas was introduced while stirring gently, and the polymerization reaction was carried out for about 6 hours while maintaining the liquid temperature in the flask at around 60°C, resulting in an acrylic copolymer with a weight average molecular weight of 650,000 Coalescence (3) was obtained.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added to 70 parts by weight of the acrylic copolymer (3) as a modified olefin resin. 50,000, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (7) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (8) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 9]
In a four-neck flask equipped with a stirring blade, thermometer, nitrogen gas inlet tube, and condenser, n-butyl acrylate/acrylic acid (95 parts by weight/5 parts by weight) and 2,2'-azobisiso as an initiator were added. 0.2 parts by weight of butyronitrile and 233 parts by weight of ethyl acetate were charged, nitrogen gas was introduced with gentle stirring, and the polymerization reaction was carried out for about 6 hours while maintaining the liquid temperature in the flask at around 60°C. An acrylic copolymer (4) with a molecular weight of 700,000 was obtained.
To 85 parts by weight of the acrylic copolymer (4), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added as a modified olefin resin. 50,000, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (8). was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (9) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 10]
Acrylic copolymer (2) was obtained in the same manner as in Example 7.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added to 25 parts by weight of the acrylic copolymer (2) as a modified olefin resin. 50,000, melting point 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, and the mixture was diluted with toluene to form an adhesive (9) with a solid content of 15%. Prepared.
The obtained adhesive was coated on a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 3 μm, An adhesive tape (10) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 11]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-T", weight average molecular weight: 7) was added to 15 parts by weight of the acrylic copolymer (1) as a modified olefin resin. 50,000, melting point: 90°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (10). was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (11) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 12]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 85 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight 7) was added as a modified olefin resin. 50,000, melting point 70°C) and 0.5 parts by weight of an aluminum chelate crosslinking agent (trade name "Aluminum Chelate A", manufactured by Kawaken Fine Chemicals Co., Ltd.) were added, and diluted with toluene to obtain a solid content of 15. % adhesive (11) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (12) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 13]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 15 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight 7) was added as a modified olefin resin. .50,000, melting point 70°C) and 0.2 parts by weight of an aluminum chelate crosslinking agent (trade name "Aluminum Chelate A", manufactured by Kawaken Fine Chemicals Co., Ltd.) were added, and diluted with toluene to obtain a solid content of 15. % adhesive (12) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 5 μm. , an adhesive tape (13) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Example 14]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 25 parts by weight of the acrylic copolymer (1), a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-T", weight average molecular weight 7) was added as a modified olefin resin. 50,000, melting point 90°C) and 0.1 part by weight of an epoxy crosslinking agent (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "Tetrad C") were added, and diluted with toluene to make an adhesive with a solid content of 15% ( 13) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 12 μm) so that the thickness of the adhesive layer after drying was 5 μm. , an adhesive tape (14) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 1.

[Comparative example 1]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
For 100 parts by weight of acrylic copolymer (1), 18 parts by weight of modified rosin resin (manufactured by Harima Kasei Co., Ltd., trade name "Hariestar KT-3"), isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Hariestar KT-3"), 2 parts by weight of Coronate L'') were added and diluted with toluene to prepare an adhesive (C1) with a solid content of 15%.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C1) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative example 2]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 100 parts by weight of acrylic copolymer (1), 2 parts by weight of an isocyanate crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") was added, diluted with toluene, and an adhesive with a solid content of 15% ( C2) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C2) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative example 3]
Acrylic copolymer (1) was obtained in the same manner as in Example 1.
To 100 parts by weight of acrylic copolymer (1), 0.5 parts by weight of an epoxy crosslinking agent (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "Tetrad C") was added, and the mixture was diluted with toluene to give a solid content of 15%. An adhesive (C3) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C3) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative example 4]
Acrylic copolymer (4) was obtained in the same manner as in Example 9.
To 100 parts by weight of acrylic copolymer (4), 30 parts by weight of terpene phenol resin (manufactured by Yasuhara Chemical Co., Ltd., trade name "YS Polystar S-145", softening point: about 145°C), isocyanate crosslinking agent (Tosoh Co., Ltd.) 0.03 parts by weight of an epoxy crosslinking agent (manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "Tetrad C") were added, and the mixture was diluted with toluene to give a solid content of 15%. An adhesive (C4) was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C4) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative example 5]
2-ethylhexyl acrylate/2-hydroxyethyl acrylate (100 parts by weight/4 parts by weight) and 2,2' as an initiator were placed in a four-neck flask equipped with a stirring blade, a thermometer, a nitrogen gas inlet tube, and a condenser. - Charge 0.2 parts by weight of azobisisobutyronitrile and 233 parts by weight of ethyl acetate, introduce nitrogen gas while stirring gently, and maintain the liquid temperature in the flask at around 60°C to carry out a polymerization reaction for about 6 hours. An acrylic copolymer (5) having a weight average molecular weight of 550,000 was obtained.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added to 85 parts by weight of the acrylic copolymer (5) as a modified olefin resin. 50,000, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L") were added, diluted with toluene, and the solid content was 15% (C5). was prepared.
The obtained adhesive was coated on a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness 30 μm) so that the thickness of the adhesive layer after drying was 10 μm, An adhesive tape (C5) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative example 6]
Acrylic copolymer (5) was obtained in the same manner as in Comparative Example 5.
Maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 7) was added to 25 parts by weight of the acrylic copolymer (5) as a modified olefin resin. Add 75 parts by weight of .50,000, melting point: 70°C) and 2 parts by weight of an isocyanate-based crosslinking agent (manufactured by Tosoh Corporation, trade name "Coronate L"), dilute with toluene, and make an adhesive (C6) with a solid content of 15%. was prepared.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C6) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

[Comparative Example 7]
As a modified olefin resin, 100 parts by weight of a maleic anhydride-modified propylene-butene copolymer resin (manufactured by Toyobo Co., Ltd., trade name "Toyotac PMA-L", weight average molecular weight: 75,000, melting point: 70 ° C.) was added to toluene. An adhesive (C7) was prepared by dissolving and having a solid content of 15%.
The obtained adhesive was applied onto a base material (polypropylene film, manufactured by Toray Industries, Inc., trade name "Torefane", thickness: 30 μm) so that the thickness of the adhesive layer after drying was 10 μm. , an adhesive tape (C7) was obtained.
The obtained adhesive tape was subjected to the evaluations (1) to (5) above. The results are shown in Table 2.

10 Base material 20 Adhesive layer 100 Adhesive tape for non-aqueous batteries

Claims (13)

An adhesive that exhibits adhesive properties by pressure bonding,
comprising an acrylic polymer having an acid functional group and a crystalline resin having a melting point of 25°C or higher;
Adhesive for non-aqueous batteries. The adhesive for non-aqueous batteries according to claim 1, which develops adhesive properties by heating. 3. The acrylic polymer having an acid functional group has a structural unit a derived from a (meth)acrylic acid alkyl ester having a linear or branched alkyl group having 4 or more carbon atoms. The adhesive for non-aqueous batteries described above. The nonaqueous battery adhesive according to claim 3, wherein the content of the structural unit a is 50 parts by weight or more based on 100 parts by weight of the acrylic polymer having an acid functional group. The non-aqueous battery adhesive according to any one of claims 1 to 4, wherein the crystalline resin is a polyolefin resin. The adhesive for non-aqueous batteries according to claim 5, wherein the polyolefin resin is a maleic anhydride-modified polyolefin resin, a maleic acid-modified polyolefin resin, or an acrylic-modified polyolefin resin. The non-aqueous battery adhesive according to any one of claims 1 to 6, comprising a C5 petroleum resin and/or a C9 petroleum resin. An adhesive tape for non-aqueous batteries, comprising the adhesive for non-aqueous batteries according to any one of claims 1 to 7. comprising a base material and an adhesive layer disposed on at least one side of the base material,
The adhesive layer contains the non-aqueous battery adhesive according to any one of claims 1 to 7.
The adhesive tape for non-aqueous batteries according to claim 8. The base material is formed from at least one selected from polyacrylate, polyurethane, polyimide, aramid, polyamide, ethylene/vinyl alcohol copolymer, polyetherimide, polyvinylidene fluoride, polyester, polypropylene, polyethylene, and polyphenylene sulfide. 10. The adhesive tape for non-aqueous batteries according to claim 9. The adhesive tape for nonaqueous batteries according to claim 9 or 10, wherein a release film is provided on the side of the adhesive layer opposite to the base material. the adhesive layer is disposed on one side of the base material,
another adhesive layer is disposed on the other side of the substrate;
The adhesive tape for nonaqueous batteries according to any one of claims 9 to 11. A non-aqueous battery comprising the adhesive tape for non-aqueous batteries according to any one of claims 8 to 12.

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