JP6278167B1 - Polyolefin adhesive composition - Google Patents

Abstract

It is an object to provide an adhesive composition containing a modified polyolefin and an epoxy resin that has good pot life and good adhesion between a metal substrate and a polyolefin resin substrate. A crystalline acid-modified polyolefin (A) having an acid value of 5 to 50 mgKOH / g-resin, a glycidylamine type epoxy resin (B1), a glycidyl ether type epoxy resin (B2), and an organic solvent (E); An adhesive composition containing either one of an acid anhydride monomer (C) and a heterocyclic compound (D) having two or more nitrogen atoms.

Description

  The present invention relates to an adhesive composition for bonding a polyolefin resin substrate and a metal substrate. More specifically, the present invention relates to an adhesive composition containing a crystalline acid-modified polyolefin, an epoxy resin and an organic solvent, and further containing any one of an acid anhydride monomer and a heterocyclic compound having two or more nitrogen atoms.

  2. Description of the Related Art Conventionally, laminates formed by applying a vinyl chloride resin (hereinafter also simply referred to as “vinyl chloride”) to the surface of metal base materials such as home appliance outer panels, furniture materials, and building interior members have been laminated. Although it has been used, environmental problems have been raised recently, and polyolefin resins have been proposed as an alternative to PVC. Polyolefin resins are not toxic, have strong durability against acids, alkalis, organic solvents, etc., are excellent in mechanical strength and wear resistance, and are inexpensive, so they are widely used in various fields.

  However, since the polyolefin resin is non-polar, it is difficult to adhere to the metal substrate. Conventionally, various adhesives have been proposed for adhesion between the polyolefin resin and the metal substrate. Typically, a solvent dispersion-type modified polyolefin resin is mixed with a base adhesive in which a thermosetting resin such as a phenol resin, a melamine resin, or an epoxy resin or a thermoplastic resin is dissolved in an organic solvent. However, it has been difficult to say that these adhesives have sufficient adhesiveness. In addition, an adhesive composition (patent document 1) in which catechol or the like is blended with a crystalline acid-modified polyolefin and an epoxy resin, and an adhesive composition (patent document 2) in which a maleic acid-modified chlorinated polypropylene, a chelate epoxy resin, and a solvent are blended. ) Has also been proposed.

JP 2003-261847 A JP 2009-292853 A

  However, in the above method, the pot life after blending with the acid-modified polyolefin solution may be poor, and even if the pot life is not so problematic, the adhesion and chemical resistance with the metal base material are not sufficient. . That is, there was nothing that satisfied pot life, adhesiveness and chemical resistance. In particular, even when a polypropylene (hereinafter also referred to as PP) substrate is used, there is no adhesive that can be bonded and aged (cured) at a low temperature of 80 ° C. or less, which is less affected by heat shrinkage. Here, the pot life property refers to the stability of the solution immediately after the compounding or after a certain period of time when a crosslinking agent or a curing agent is compounded with the acid-modified polyolefin.

  As a laminate of a polyolefin resin base material and a metal base material, a laminate in which a polypropylene film and an aluminum foil are bonded together with an adhesive has recently been actively used as an exterior body for a lithium ion battery. The laminate is required to have chemical resistance (hereinafter also referred to as “electrolytic solution resistance”) to the electrolytic solution as the contents.

Moreover, the electrolyte solution of a lithium ion battery is obtained, for example, by dissolving lithium salts such as LiPF ₆ and LiBF ₄ as an electrolyte in a non-aqueous solvent such as carbonates. A lithium salt used as an electrolyte is hydrolyzed by moisture to generate hydrogen fluoride. For this reason, when hydrogen fluoride is generated, the metal members constituting the battery may corrode or the adhesiveness between layers of the laminated film type packaging material used as the exterior body may be deteriorated. is there.

  The present invention has been made in view of the above-described conventional problems, and as a result of intensive studies on the adhesive between a polyolefin resin substrate and a metal substrate, the present inventors have found that a crystalline acid-modified polyolefin (hereinafter, Simply referred to as an acid-modified polyolefin), an adhesive composition containing an epoxy resin and an organic solvent, and further containing either an acid anhydride monomer or a heterocyclic compound having two or more nitrogen atoms. And bonding at 80 ° C. or lower, adhesiveness and chemical resistance in aging, particularly resistance to electrolytic solution mixed with moisture, and the present invention has been completed.

  That is, the present invention has good pot life properties after blending a crystalline acid-modified polyolefin, a curing agent and a curing accelerator, and both a polyolefin resin substrate and a metal substrate in low temperature bonding and aging. An object of the present invention is to provide an adhesive composition having good adhesion and chemical resistance.

  In order to achieve the above-mentioned problems, the present inventors have intensively studied and have proposed the following invention.

  A crystalline acid-modified polyolefin (A) having an acid value of 5 to 50 mgKOH / g-resin, a glycidylamine type epoxy resin (B1), a glycidyl ether type epoxy resin (B2), and an organic solvent (E); An adhesive composition containing either one of an acid anhydride monomer (C) and a heterocyclic compound (D) having two or more nitrogen atoms.

  The glycidylamine type epoxy resin (B1) is preferably an epoxy resin having two or more glycidyl groups in one molecule.

（一般式（１）中、Ｒは置換基を有してもよいアリール基であり、Ｘ１およびＸ２はそれぞれ独立して置換基を有してもよい炭素数１〜５のアルキレン基であり、ｍは１または２であり、ｎは１または２である。）The glycidylamine type epoxy resin (B1) is preferably a compound represented by the general formula (1).

(In General Formula (1), R is an aryl group which may have a substituent, X1 and X2 are each independently an alkylene group having 1 to 5 carbon atoms which may have a substituent, m is 1 or 2, and n is 1 or 2.)

  The glycidyl ether type epoxy resin (B2) is preferably an epoxy resin having two or more glycidyl groups in one molecule and containing no nitrogen atom.

  The acid anhydride monomer (C) is preferably a compound having one or more acid anhydride rings in one molecule and an acid value of 100 mgKOH / g or more.

  The heterocyclic compound (D) having two or more nitrogen atoms is preferably a 5-membered aromatic heterocyclic compound having two or more nitrogen atoms.

  0.01 to 20 parts by mass of glycidylamine type epoxy resin (B1), 1 to 50 parts by mass of glycidyl ether type epoxy resin (B2) with respect to 100 parts by mass of crystalline acid-modified polyolefin (A), acid anhydride It is preferable to contain 1 to 50 parts by mass of the monomer (C), 0.01 to 5 parts by mass of the heterocyclic compound (D) having two or more nitrogen atoms, and 80 to 1000 parts by mass of the organic solvent (E).

  The organic solvent (E) is a mixed liquid of the solvent (E1) and the solvent (E2), and the solvent (E1) is composed of an aromatic hydrocarbon, an aliphatic hydrocarbon, an alicyclic hydrocarbon, and a halogenated hydrocarbon. One or more solvents selected from the group, and the solvent (C2) is one or more solvents selected from the group consisting of alcohol solvents, ketone solvents, ester solvents and glycol ether solvents, It is preferable that (E1) / solvent (E2) = 50 to 97/50 to 3 (mass ratio).

  Any one of said adhesive composition used for adhesion | attachment with a polyolefin resin base material and a metal base material.

  A laminate of a polyolefin resin substrate and a metal substrate bonded by the adhesive composition according to any one of the above. A packaging material for a lithium ion battery comprising the laminate as a constituent member.

  The adhesive composition according to the present invention contains a crystalline acid-modified polyolefin, two types of epoxy resins, and an organic solvent, and further includes any one of an acid anhydride monomer and a heterocyclic compound having two or more nitrogen atoms. Even if it contains and preserve | saves for a long period of time, a favorable pot life property can be maintained, without producing a thickening and gelatinization. Furthermore, it is possible to achieve both good adhesion and chemical resistance between the polyolefin resin substrate and the metal substrate even when pasting and aging at a low temperature such as 80 ° C or less where the thermal shrinkage effect of the polyolefin substrate is small. It is.

  Hereinafter, embodiments of the present invention will be described in detail.

<Crystalline acid-modified polyolefin (A)>
The crystalline acid-modified polyolefin (A) used in the present invention is not limited, but at least one of polyethylene, polypropylene, and propylene-α-olefin copolymer includes α, β-unsaturated carboxylic acid and acid anhydride thereof. Those obtained by grafting at least one of the above are preferred.

  The propylene-α-olefin copolymer is obtained by copolymerizing α-olefin with propylene as a main component. As the α-olefin, for example, ethylene, 1-butene, 1-heptene, 1-octene, 4-methyl-1-pentene, vinyl acetate or the like can be used. Among these α-olefins, ethylene and 1-butene are preferable. The ratio of the propylene component to the α-olefin component of the propylene-α-olefin copolymer is not limited, but the propylene component is preferably 50 mol% or more, and more preferably 70 mol% or more.

  Examples of at least one of α, β-unsaturated carboxylic acid and acid anhydrides thereof include maleic acid, itaconic acid, citraconic acid, and acid anhydrides thereof. Among these, acid anhydrides are preferable, and maleic anhydride is more preferable. Specific examples include maleic anhydride-modified polypropylene, maleic anhydride-modified propylene-ethylene copolymer, maleic anhydride-modified propylene-butene copolymer, maleic anhydride-modified propylene-ethylene-butene copolymer, and the like. These crystalline acid-modified polyolefins can be used alone or in combination of two or more. Of these, a maleic anhydride-modified propylene-butene copolymer is preferable. The propylene component / 1-butene component (molar ratio) of the maleic anhydride-modified propylene-butene copolymer is preferably 90-50 / 10-50, more preferably 85-60 / 15-40. Preferably, it is 80-55 / 20-45, and it is especially preferable that it is 75-60 / 25-40. By making it the said range, the especially outstanding pot life property, adhesiveness, and chemical-resistance can be expressed.

  The acid value of the crystalline acid-modified polyolefin (A) should be at least 5 mgKOH / g-resin, preferably 10 mgKOH, from the viewpoint of pot life and adhesion between the polyolefin resin substrate and the metal substrate. / G-resin or more, more preferably 14 mgKOH / g-resin or more, still more preferably 16 mgKOH / g-resin or more, particularly preferably 18 mgKOH / g-resin or more, most preferably 20 mgKOH / g. More than -resin. If it is less than the above value, the compatibility with the epoxy resin is low, the adhesive strength may not be exhibited, the crosslinking density is low, and the chemical resistance may be poor. The upper limit needs to be 50 mgKOH / g-resin or less, preferably 48 mgKOH / g-resin or less, more preferably 46 mgKOH / g-resin or less, still more preferably 44 mgKOH / g-resin or less. Preferably it is 42 mgKOH / g-resin or less, Most preferably, it is 40 mgKOH / g-resin or less. When the above value is exceeded, the viscosity and stability of the solution may decrease, and the pot life may decrease. Furthermore, it is not preferable because the production efficiency is lowered. The acid value can be controlled by the amount (addition amount) of at least one kind of α, β-unsaturated carboxylic acid and acid anhydride thereof.

  The weight average molecular weight (Mw) of the crystalline acid-modified polyolefin (A) is preferably in the range of 40,000 to 180,000. More preferably, it is the range of 50,000-160,000, More preferably, it is the range of 60,000-150,000, Most preferably, it is the range of 70,000-140,000, Most preferably, it is 80 , 13,000 to 130,000. If it is less than the above value, the cohesive force becomes weak and the adhesiveness may be inferior. On the other hand, when the above value is exceeded, there may be a problem in operability when bonding due to low fluidity. If it is in the said range, since hardening reaction with an epoxy resin is utilized, it is preferable.

  The crystallinity in the crystalline acid-modified polyolefin (A) means that the temperature is raised from −100 ° C. to 250 ° C. at 20 ° C./min using a differential scanning calorimeter (DSC), and a clear melting occurs in the temperature raising process. This refers to the peak.

  By making the acid-modified polyolefin crystalline, it is advantageous because it has a stronger cohesion than amorphous and is excellent in adhesion and chemical resistance.

  The melting point (Tm) of the crystalline acid-modified polyolefin (A) is preferably in the range of 50 ° C to 120 ° C. More preferably, it is the range of 60 to 100 degreeC, Most preferably, it is the range of 70 to 90 degreeC. If it is less than the above value, the cohesive force derived from crystals becomes weak, and the adhesiveness and chemical resistance may be inferior. On the other hand, when the above value is exceeded, the solution stability and fluidity are low, and there may be a problem in operability when bonding.

  The heat of fusion (ΔH) of the crystalline acid-modified polyolefin (A) is preferably in the range of 5 J / g to 60 J / g. More preferably, it is the range of 10 J / g-50 J / g, Most preferably, it is the range of 20 J / g-40 J / g. If it is less than the above value, the cohesive force derived from crystals becomes weak, and the adhesiveness and chemical resistance may be inferior. On the other hand, when the above value is exceeded, the solution stability and fluidity are low, and there may be a problem in operability when bonding.

  The production method of the crystalline acid-modified polyolefin (A) is not particularly limited. For example, a radical graft reaction (that is, a radical species is generated with respect to a polymer to be a main chain, and the radical species is used as a polymerization initiation point to produce an unsaturated carboxylic acid. Reaction for graft polymerization of acid and acid anhydride), and the like.

  Although it does not specifically limit as a radical generator, It is preferable to use an organic peroxide. The organic peroxide is not particularly limited, but di-tert-butyl peroxyphthalate, tert-butyl hydroperoxide, dicumyl peroxide, benzoyl peroxide, tert-butyl peroxybenzoate, tert-butyl peroxy- Peroxides such as 2-ethylhexanoate, tert-butyl peroxypivalate, methyl ethyl ketone peroxide, di-tert-butyl peroxide, lauroyl peroxide; azobisisobutyronitrile, azobisisopropionitrile, etc. Examples thereof include azonitriles.

<Glycidylamine type epoxy resin (B1)>
The glycidylamine type epoxy resin (B1) used for this invention will not be specifically limited if it is an epoxy resin which has a 1 or more glycidyl group in 1 molecule. It is preferable to have two or more glycidyl groups in one epoxy resin molecule, more preferably three or more glycidyl groups in one molecule of epoxy resin, and four or more glycidyl groups in one molecule of epoxy resin. More preferably, it has.

一般式（１）中、Ｒは置換基を有してもよいアリール基であり、好ましくは置換基を有してもよいフェニル基である。前記アリール基の置換基としては、特に限定されないが、炭素数１以上５以下のアルキル基、炭素数１以上５以下のアルコキシ基、水酸基、アミノ基、グリシジル基、グリシジルアミノ基、またはグリシジルエーテル基が挙げられる。Ｘ１およびＸ２はそれぞれ独立して炭素数１以上５以下の置換基を有してもよい直鎖のアルキレン基であり、好ましい炭素数は４以下であり、より好ましくは３以下であり、さらに好ましくは２以下である。前記アルキレン基の置換基としては、特に限定されないが、炭素数１以上５以下のアルキル基、炭素数１以上５以下のアルコキシ基、またはアミノ基が挙げられる。ｍは１または２であり、ｎは１または２である。好ましくは、ｍまたはｎのいずれかが２であり、より好ましくは、ｍ、ｎとも２である。Further, the glycidylamine type epoxy resin (B1) is preferable because the chemical resistance is further improved by using a compound represented by the following general formula (1).

In general formula (1), R is an aryl group which may have a substituent, and preferably a phenyl group which may have a substituent. The substituent of the aryl group is not particularly limited, but is an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, a hydroxyl group, an amino group, a glycidyl group, a glycidylamino group, or a glycidyl ether group. Is mentioned. X1 and X2 are each independently a linear alkylene group which may have a substituent having 1 to 5 carbon atoms, preferably 4 or less, more preferably 3 or less, and still more preferably Is 2 or less. Although it does not specifically limit as a substituent of the said alkylene group, A C1-C5 alkyl group, a C1-C5 alkoxy group, or an amino group is mentioned. m is 1 or 2, and n is 1 or 2. Preferably, either m or n is 2, more preferably m and n are both 2.

  Specific examples of the glycidylamine type epoxy resin (B1) are not particularly limited, but include tetraglycidyldiaminodiphenylmethane, triglycidylparaaminophenol, tetraglycidylbisaminomethylcyclohexanone, N, N, N ′, N′-tetraglycidyl-m. -Glycidylamine type | system | groups, such as xylenediamine, etc. are mentioned. Of these, N, N, N ′, N′-tetraglycidyl-m-xylenediamine is preferred. These glycidylamine type epoxy resins (B1) can be used alone or in combination of two or more.

  The blending amount of the glycidylamine type epoxy resin (B1) is preferably 0.01 parts by mass or more, and 0.05 parts by mass or more with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A). More preferably, it is more preferably 0.1 parts by mass or more, particularly preferably 1 part by mass or more, and most preferably 2 parts by mass or more. If it is less than the above range, the catalytic action is not exhibited, and there are cases where adhesion at 80 ° C. or lower and aging adhesion and chemical resistance are low. Further, it is preferably 20 parts by mass or less, more preferably 18 parts by mass or less, further preferably 16 parts by mass or less, particularly preferably 14 parts by mass or less, and 12 parts by mass or less. Most preferably it is. Above the range, the crosslinking reaction proceeds excessively, the rigidity becomes high, and the adhesiveness tends to be lowered. Further, the crosslinking reaction tends to proceed during storage of the adhesive composition solution, and the pot life tends to be reduced.

<Glycidyl ether type epoxy resin (B2)>
The glycidyl ether type epoxy resin (B2) used for this invention will not be specifically limited if it is an epoxy resin which has a glycidyl ether group in a molecule | numerator. Preferably, it is an epoxy resin having two or more glycidyl groups in one molecule of the epoxy resin, and more preferably an epoxy resin having two or more glycidyl groups in one molecule of the epoxy resin and containing no nitrogen atom. .

  The blending amount of the glycidyl ether type epoxy resin (B2) is preferably 1 part by mass or more, more preferably 2 parts by mass or more, relative to 100 parts by mass of the crystalline acid-modified polyolefin (A). More preferably, it is more preferably 4 parts by mass or more, and most preferably 5 parts by mass or more. Further, it is preferably 50 parts by mass or less, more preferably 40 parts by mass or less, further preferably 30 parts by mass or less, particularly preferably 25 parts by mass or less, and 20 parts by mass or less. Most preferably it is. By setting it in the above range, excellent adhesiveness and chemical resistance can be expressed.

  Specific examples of the glycidyl ether type epoxy resin (B2) are not particularly limited, and examples thereof include phenol novolac type epoxy resins and cresol novolac type epoxy resins, and these are viewpoints of adhesion to metal substrates and chemical resistance. To preferred. These glycidyl ether type epoxy resins (B2) can be used alone or in combination of two or more.

  In this invention, two types of epoxy resins, the said glycidyl amine type epoxy resin (B1) and the said glycidyl ether type epoxy resin (B2), are used together as an essential component. By using the glycidylamine type epoxy resin (B1) and the glycidyl ether type epoxy resin (B2) in combination, excellent adhesiveness and chemical resistance can be expressed. That is, the glycidylamine type epoxy resin (B1) has a reaction and curing action between the crystalline acid-modified polyolefin (A) and the glycidyl ether type epoxy resin (B2). Further, the glycidylamine type epoxy resin (B1) is composed of crystalline acid-modified polyolefin (A) and glycidylamine type epoxy resin (B1), glycidylamine type epoxy resin (B1), and glycidyl ether type epoxy resin (B2), Since it has a reaction and curing catalytic action of the glycidylamine type epoxy resin (B1) and the glycidyl ether type epoxy resin (B2), it is bonded at 80 ° C. or lower by adhesion, and adhesion to a metal substrate in aging And chemical resistance can be improved.

  The total amount of the glycidylamine type epoxy resin (B1) and the glycidyl ether type epoxy resin (B2) is preferably 2 to 70 parts by mass with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A). It is more preferably 5 to 50 parts by mass, and most preferably 10 to 30 parts by mass. If the amount is less than the above range, sufficient curing effect may not be obtained and the adhesiveness and chemical resistance may be low, and if it exceeds the above range, it is not preferable from the viewpoints of pot life and reduced adhesion between the olefin substrate and cost.

  The blending amount of the glycidylamine type epoxy resin (B1) is preferably 1 to 50% by mass, more preferably 2 to 30% by mass, and most preferably 3 to 10% by mass based on the entire epoxy resin. . If the blending amount is less than the above, the catalytic action does not appear and the adhesion and chemical resistance in low temperature bonding and aging may be low. If it exceeds the above, the crosslinking reaction proceeds excessively and the rigidity becomes high. The adhesiveness tends to decrease. Further, the crosslinking reaction tends to proceed during storage of the adhesive composition solution, and the pot life tends to be reduced.

  Other epoxy resins can be used in combination as the epoxy resin used in the present invention. For example, glycidyl ester type such as hexahydrophthalic acid glycidyl ester, dimer acid glycidyl ester, triglycidyl isocyanurate, or 3,4-epoxycyclohexylmethylcarboxylate, epoxidized polybutadiene, epoxidized soybean oil Group epoxides and the like, and may be used alone or in combination of two or more.

<Acid anhydride monomer (C)>
The acid anhydride monomer (C) used in the present invention is not particularly limited as long as it is a compound having one or more acid anhydride rings in one molecule. Phthalic anhydride, trimellitic anhydride, tetrahydrophthalic anhydride, Alicyclic structures such as methyltetrahydrophthalic anhydride, methylpentahydrophthalic anhydride, methyltrihydrophthalic anhydride, trialkyltetrahydrophthalic anhydride, methylcyclohexenedicarboxylic anhydride, het acid anhydride, tetrabromophthalic anhydride, or aromatic Those having a ring structure, succinic anhydride, maleic anhydride, glutaric anhydride, butyl succinic anhydride, hexyl succinic anhydride, octyl succinic anhydride, dodecyl succinic anhydride, dodecenyl succinic anhydride, tetrapropenyl succinic acid Acid anhydride, butylmaleic anhydride, pentylmaleic acid Water, hexyl maleic anhydride, octyl maleic anhydride, decyl maleic anhydride, dodecyl maleic anhydride, butyl glutamic anhydride, hexyl glutamic anhydride, heptyl glutamic anhydride, octyl glutamic anhydride, decyl glutamic anhydride And those having an alkyl chain and an acid anhydride, such as dodecylglutamic acid anhydride, may be used alone or in combination. Specifically, Rikacid (registered trademark) manufactured by Shin Nippon Rika Co., Ltd. is marketed and can be used.

  By using the acid anhydride monomer (C) having reactivity with the glycidylamine type epoxy resin (B1) and / or the glycidyl ether type epoxy resin (B2) in combination with the crystalline acid-modified polyolefin (A), the crosslinking density is reduced. For example, even when water is mixed in the electrolytic solution, the chemical resistance (electrolytic solution resistance) of the adhesive composition does not decrease, and a good state can be maintained.

  The acid value of the acid anhydride monomer is preferably 100 mgKOH / g or more, more preferably 150 mgKOH / g or more, and further preferably 200 mgKOH / g or more. If it is less than the above value, the curing accelerating effect is not exhibited, and the chemical resistance of the adhesive composition may be lowered. Moreover, it is preferable that an acid value is 1000 mgKOH / g or less, It is more preferable that it is 900 mgKOH / g or less, It is further more preferable that it is 800 mgKOH / g or less. If it exceeds the above value, pot life may be lowered.

  The compounding amount of the acid anhydride monomer (C) used in the present invention is preferably 1 part by mass or more and more preferably 2 parts by mass or more with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A). It is preferably 3 parts by mass or more, more preferably 4 parts by mass or more, and most preferably 5 parts by mass or more. Further, it is preferably 50 parts by mass or less, more preferably 48 parts by mass or less, further preferably 45 parts by mass or less, particularly preferably 40 parts by mass or less, and 35 parts by mass or less. Most preferably it is. By setting it in the above range, excellent adhesiveness and chemical resistance can be expressed.

<Heterocyclic compound (D) having two or more nitrogen>
The heterocyclic compound (D) having two or more nitrogen atoms used in the present invention is a heterocyclic compound having two or more nitrogen atoms in one molecule, and has two nitrogen atoms as a ring component of the heterocyclic ring. It is preferable that there is more. The heterocyclic compound (D) having two or more nitrogen atoms is an excellent curing accelerating action between the crystalline polyolefin (A) and the glycidylamine type epoxy resin (B1) and / or the glycidyl ether type epoxy resin (B2) ( Catalytic action). Therefore, by containing the heterocyclic compound (D) having two or more nitrogen atoms, for example, even when water is mixed in the electrolytic solution, the chemical resistance (electrolytic solution resistance) of the adhesive composition. Does not decrease, and a good state can be maintained. Furthermore, by using together with the said acid anhydride monomer (C), a crosslinking density can be raised efficiently and very outstanding adhesiveness and chemical resistance can be expressed. For example, even when moisture is mixed in the electrolytic solution, the chemical resistance (electrolytic solution resistance) of the adhesive composition does not decrease, and an extremely good state can be maintained.

  The heterocyclic compound (D) having two or more nitrogen atoms is not particularly limited, and aliphatic heterocyclic compounds such as piperazine compounds, 5-membered aromatic heterocyclic compounds such as imidazole compounds and pyrazole compounds, and pyrimidine compounds. , Pyridazine compounds, pyrazine compounds, 6-membered aromatic heterocyclic compounds such as triazine compounds, quinazoline compounds, phthalazine compounds, pteridine compounds, benzimidazole compounds, purine compounds, and other polycyclic aromatic heterocyclic compounds, In particular, an imidazole compound is preferable from the viewpoint of catalytic effect and chemical resistance. Specifically, 1,2-dimethylimidazole, 1-methyl-2-ethylimidazole, 2-methylimidazole, 2-ethyl-4-methylimidazole, 2-undecylimidazole, 2-heptadecylimidazole, 2-phenyl Imidazole, 1-benzyl-2-methylimidazole, 1-benzyl-2-phenylimidazole, 1-benzyl-2-phenylimidazole trimellitic acid salt, 1-benzyl-2-ethylimidazole, 1-benzyl-2-ethyl -5-methylimidazole, 2-ethylimidazole, 2-isopropylimidazole, 2-phenyl-4-benzylimidazole, 1-cyanoethyl-2-methylimidazole, 1-cyanoethyl-2-ethyl-4-methylimidazole, 1-cyanoethyl -2-Undeci Imidazole, 1-cyanoethyl-2-isopropylimidazole, 1-cyanoethyl-2-phenylimidazole, 1-cyanoethyl-2-methylimidazolium trimellitate, 1-cyanoethyl-2-phenylimidazolium trimellitate, 1-cyanoethyl- 2-phenyl-4,5-di (cyanoethoxymethyl) imidazole, 2,4-diamino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine, 2,4-diamino-6 -[2'-ethyl-4-methylimidazolyl- (1 ')]-ethyl-s-triazine, 2,4-diamino-6- [2'-undecylimidazolyl- (1')]-ethyl-s- Triazine, 2-methylimidazolium isocyanuric acid adduct, 2-phenylimidazolium isocyanuric acid addition 2,4-diamino-6- [2'-methylimidazolyl- (1 ')]-ethyl-s-triazine-isocyanuric acid adduct, 2-phenyl-4,5-dihydroxylmethylimidazole, 2-phenyl -4-benzyl-5-hydroxylmethylimidazole, 4,4'-methylene-bis (2-ethyl-5-methylimidazole), 1-aminoethyl-2-methylimidazole, 1-dodecyl-2-methyl-3- Benzylimidazolium chloride, 2-methylimidazole / benzotriazole adduct, 1-aminoethyl-2-ethylimidazole, 1- (cyanoethylaminoethyl) -2-methylimidazole, N, N ′-[2-methylimidazolyl- ( 1) -Ethyl] -adipoyldiamide, N, N′-bis- [2-methylimidazolyl] (1) -ethyl] urea, N- [2-methylimidazolyl-1-ethyl] urea, N, N ′-[2-methylimidazolyl- (1) -ethyl] dodecandioyldiamide, N, N ′-[ 2-methylimidazolyl- (1) -ethyl] eicosanedioyl diamide, 1-benzyl-2-phenylimidazole / hydrochloride, and the like.

  It is preferable that the compounding quantity of the heterocyclic compound (D) which has two or more nitrogen is 0.01 mass part or more with respect to 100 mass parts of crystalline acid-modified polyolefin (A), and 0.02 mass part More preferably, it is more preferably 0.05 parts by mass or more, particularly preferably 0.1 parts by mass or more, and most preferably 0.2 parts by mass or more. If it is less than the above range, the curing promoting (catalytic) action may not be exhibited, and bonding at 80 ° C. or lower may be difficult. For example, when the aging is performed at about 40 ° C. at which the PP base material is not affected by shrinkage or the like, the adhesiveness and chemical resistance may be lowered, or it may be necessary to provide a long aging time. Further, it is preferably 5 parts by mass or less, more preferably 4 parts by mass or less, further preferably 3 parts by mass or less, particularly preferably 2 parts by mass or less, and 1 part by mass or less. Most preferably it is. Above the range, the crosslinking reaction proceeds excessively, the rigidity becomes high, and the adhesiveness tends to be lowered. Further, the crosslinking reaction tends to proceed during storage of the adhesive composition solution, and the pot life tends to be reduced. Moreover, it is not preferable also from a viewpoint of manufacturing cost.

  The compounding quantity of the heterocyclic compound (D) which has two or more nitrogen is 1-100 mass% with respect to the total compounding quantity of a glycidyl amine type epoxy resin (B1) and a glycidyl ether type epoxy resin (B2). It is preferable that it is 2 to 70% by mass, and most preferably 3 to 50% by mass. When the blending amount is less than the above, the catalytic action does not appear, and the adhesion and chemical resistance in low temperature bonding and aging may be low. If it exceeds the above range, the crosslinking reaction proceeds excessively, the rigidity becomes high and the adhesiveness tends to decrease, and the crosslinking reaction tends to proceed during solution storage of the adhesive composition, and the pot life tends to decrease. Moreover, it is not preferable also from a viewpoint of manufacturing cost.

  The heterocyclic compound (D) having two or more nitrogen atoms may be blended alone, a plurality of compounds may be used in combination, or a combination with other curing accelerators. Other curing accelerators include carboxylic acid metal salts, tertiary amines, quaternary ammonium salts, organic peroxides, hydrazine compounds, metal chelate compounds, thioureas, phosphorus-containing compounds, basic vulcanizing agents, and the like. Can be mentioned. Examples of the carboxylic acid metal salt include metal salts of carboxylic acids having 1 to 30 carbon atoms. Examples of the carboxylic acid constituting the carboxylic acid metal salt include acetic acid, butyric acid, octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid, octenoic acid, erucic acid, and elaidin. Acids, adipic acid, malonic acid, succinic acid, glutaric acid, citric acid, tartaric acid, malic acid, diglycolic acid and other aliphatic carboxylic acids; benzoic acid, chlorobenzoic acid, anisic acid, aminobenzoic acid, phthalic acid, terephthalic acid Aromatic carboxylic acids such as acid, naphthoic acid, naphthalenedicarboxylic acid, and benzenetricarboxylic acid; naphthenic acid; acetone acid and the like. Moreover, as a metal which comprises the said carboxylic acid metal salt, Li, Na, K, Mg, Ca, Zn, Al, Cu, Pb, Co, Fe, Mn, Sn, Ti etc. are mentioned, for example. Specific examples of the carboxylic acid metal salt include lithium acetate, sodium acetate, magnesium acetate, aluminum acetate, potassium butyrate, calcium butyrate, zinc butyrate, sodium octoate, calcium octoate, potassium decanoate, magnesium decanoate, and decane. Zinc oxide, lithium laurate, sodium laurate, calcium laurate, aluminum laurate, potassium myristate, sodium myristate, aluminum myristate, sodium palmitate, zinc palmitate, magnesium palmitate, sodium stearate, potassium stearate, Calcium stearate, zinc stearate, sodium oleate, sodium behenate, sodium benzoate, zinc benzoate, sodium phthalate, phthalic acid Minium, magnesium terephthalate, calcium naphthalene dicarboxylate, dibutyltin laurate, tributyltin laurate, dioctyltin laurate, tributyltin acetate, dibutyltin diacetate, dioctyltin diacetate, dibutyltin 2-ethylhexoate, tetrabutyl titanate, tetraisobutyl Examples include titanate, tetra-2-ethylhexyl titanate, cobalt naphthenate, copper naphthenate, magnesium naphthenate, and cobalt acetoacetate. Among these, preferably, lithium laurate, sodium laurate, calcium laurate, aluminum laurate, potassium myristate, sodium myristate, aluminum myristate, sodium palmitate, zinc palmitate, magnesium palmitate, sodium stearate, Examples include potassium stearate, calcium stearate, zinc stearate, and sodium oleate. Moreover, as the metal salt of carboxylic acid, a polymer having a metal salt structure of carboxylic acid can also be used. Such polymers include ethylene and radically polymerizable carboxylic acid group IA, IIA, IIB, and IIIB metal (eg, Li, Na, K, Mg, Ca, Zn, Al, etc.) salts. Examples thereof include those having a polymerized structure; those having a structure in which ethylene, a metal salt of a radically polymerizable carboxylic acid and other radically polymerizable carboxylic acid and / or a derivative thereof are copolymerized in a multi-component system. Examples of the tertiary amines include dimethylaniline, triethanolamine, dimethyl-p-toluidine, and the like. Examples of the hydrazine compound include 1-acetyl-2-phenylhydrazine. Moreover, as said metal chelate compound, vanadium acetylacetonate etc. are mentioned, for example. Examples of the thioureas include dimethylphosphine and triphenylphosphine. Examples of the phosphorus-containing compound include dimethylphosphine and triphenylphosphine. Examples of the basic vulcanizing agent include hexamethylenetetraamine, n-butyraldehyde-aniline condensate, and the like.

<Organic solvent (E)>
The organic solvent (E) used in the present invention contains crystalline acid-modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), acid anhydride monomer (C), and nitrogen. It will not be specifically limited if it dissolves the heterocyclic compound (D) which has one or more. Specifically, for example, aromatic hydrocarbons such as benzene, toluene and xylene, aliphatic hydrocarbons such as hexane, heptane, octane and decane, and alicyclic carbons such as cyclohexane, cyclohexene, methylcyclohexane and ethylcyclohexane Halogenated hydrocarbons such as hydrogen, trichloroethylene, dichloroethylene, chlorobenzene, chloroform, alcohol solvents such as methanol, ethanol, isopropyl alcohol, butanol, pentanol, hexanol, propanediol, phenol, acetone, methyl isobutyl ketone, Ketone solvents such as methyl ethyl ketone pentanone, hexanone, cyclohexanone, isophorone, acetophenone, cellsolves such as methyl cellosolve, ethyl cellosolve, methyl acetate, ethyl acetate, acetic acid Ester solvents such as chill, methyl propionate, butyl formate, ethylene glycol mono-n-butyl ether, ethylene glycol mono-iso-butyl ether, ethylene glycol mono-tert-butyl ether, diethylene glycol mono-n-butyl ether, diethylene glycol mono-iso- Glycol ether solvents such as butyl ether, triethylene glycol mono-n-butyl ether, and tetraethylene glycol mono-n-butyl ether can be used, and one or more of these can be used in combination.

  The organic solvent (E) is preferably 80 parts by mass or more, more preferably 90 parts by mass or more, and 100 parts by mass or more with respect to 100 parts by mass of the crystalline acid-modified polyolefin (A). Is more preferable, and 110 parts by mass or more is particularly preferable. If it is less than the said range, a solution state and pot life property may fall. Further, it is preferably 1000 parts by mass or less, more preferably 900 parts by mass or less, still more preferably 800 parts by mass or less, and particularly preferably 700 parts by mass or less. Exceeding the above range may be disadvantageous in terms of production cost and transportation cost.

  The organic solvent (E) is selected from the group consisting of aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons and halogenated hydrocarbons from the viewpoint of the solution state and pot life properties of the adhesive composition. A mixed solution of at least one solvent (E2) selected from the group consisting of at least one solvent (E1), an alcohol solvent, a ketone solvent, an ester solvent, and a glycol ether solvent is preferable. The mixing ratio is preferably solvent (E1) / solvent (E2) = 50 to 97/50 to 3 (mass ratio), more preferably 55 to 95/45 to 5 (mass ratio), It is more preferable that it is 60-90 / 40-10 (mass ratio), and it is especially preferable that it is 70-80 / 30-20 (mass ratio). If it is out of the above range, the solution state and pot life of the adhesive composition may be lowered. Further, it is particularly preferable that the solvent (C1) is an aromatic hydrocarbon or an alicyclic hydrocarbon, and the solvent (E2) is a ketone solvent.

<Adhesive composition>
An adhesive composition according to the present invention contains the crystalline acid-modified polyolefin (A), a glycidylamine type epoxy resin (B1), a glycidyl ether type epoxy resin (B2), and an organic solvent (E), and further an acid. It is a composition containing any one of an anhydride monomer (C) and a heterocyclic compound (D) having two or more nitrogen atoms. Preferably it has two or more of crystalline acid-modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), organic solvent (E), acid anhydride monomer (C) and nitrogen It is a composition containing a heterocyclic compound (D). Crystalline acid-modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), acid anhydride monomer (C), and heterocyclic compound (D) having two or more nitrogen atoms are It may be dissolved or dispersed in the organic solvent (E). It is preferably dissolved from the viewpoint of pot life.

  The adhesive composition according to the present invention includes the modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), acid anhydride monomer (C) as long as the performance of the present invention is not impaired. In addition to the heterocyclic compound (D) having two or more nitrogen and the organic solvent (E), various additives can be blended and used. Although it does not specifically limit as an additive, It is preferable to use a flame retardant, a pigment, an antiblocking agent, etc.

<Laminate>
The laminate of the present invention is obtained by laminating a polyolefin resin substrate and a metal substrate with the adhesive composition according to the present invention.

As a lamination method, a conventionally known laminate manufacturing technique can be used. For example, although not particularly limited, the adhesive composition is applied to the surface of the metal substrate using an appropriate application means such as a roll coater or a bar coater, and dried. After drying, while the adhesive layer formed on the surface of the metal substrate is in a molten state, a laminate structure can be obtained by laminating and bonding a polyolefin resin substrate to the coated surface.
The thickness of the adhesive layer formed by the adhesive composition is not particularly limited, but is preferably 0.5 to 10 μm, more preferably 0.8 to 9.5 μm, and 1 to 9 μm. More preferably.

<Polyolefin resin substrate>
What is necessary is just to select suitably from a conventionally well-known polyolefin resin as a polyolefin resin base material. For example, although not particularly limited, polyethylene, polypropylene, ethylene-propylene copolymer, and the like can be used. Among these, the use of an unstretched polypropylene film (hereinafter also referred to as CPP) is preferable. The thickness is not particularly limited, but is preferably 20 to 100 μm, more preferably 25 to 95 μm, and further preferably 30 to 90 μm. In addition, you may mix | blend a pigment and various additives with a polyolefin resin base material as needed.

<Metal base material>
Although it does not specifically limit as a metal base material, For example, various metals, such as aluminum, copper, steel, zinc, duralumin, die-casting, and its alloy can be used. Moreover, as the shape, arbitrary shapes, such as metal foil, a rolled steel plate, a panel, a pipe, a can, and a cap, can be taken. In general, aluminum foil is preferable from the viewpoint of workability and the like. Although it varies depending on the purpose of use, it is generally used in the form of a sheet having a thickness of 0.01 to 10 mm, preferably 0.02 to 5 mm.
Moreover, about these metal base materials, it is desirable to use what surface-treated in advance from a viewpoint of corrosion resistance and adhesiveness, and specifically includes chromate treatment.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the examples. In the examples and comparative examples, “parts” simply means “parts by mass”.

<Example of production of crystalline acid-modified polyolefin (A)>
Production Example 1
In a 1 L autoclave, propylene-butene copolymer (“Tuffmer (registered trademark) XM7080” manufactured by Mitsui Chemicals) 100 parts by mass, toluene 150 parts by mass and maleic anhydride 25 parts by mass, di-tert-butyl peroxide 6 parts by mass Was added, and the temperature was raised to 140 ° C., followed by further stirring for 3 hours. Then, after cooling the obtained reaction liquid, it poured into the container containing a lot of methyl ethyl ketone, and resin was deposited. Thereafter, the liquid containing the resin was centrifuged to separate and purify an acid-modified propylene-butene copolymer grafted with maleic anhydride, (poly) maleic anhydride and a low molecular weight product. Thereafter, by drying at 70 ° C. under reduced pressure for 5 hours, a maleic anhydride-modified propylene-butene copolymer (PO-1, acid value 48 mgKOH / g-resin, weight average molecular weight 50,000, Tm 75 ° C., ΔH25J / g) was obtained.

Production Example 2
A maleic anhydride-modified propylene-butene copolymer (PO-2, acid value 25 mgKOH / g-resin, weight average) except that the amount of maleic anhydride charged was changed to 20 parts by mass. Molecular weight 80,000, Tm 75 ° C., ΔH 30 J / g) was obtained.

Production Example 3
A maleic anhydride-modified propylene-butene copolymer (with the same procedure as in Production Example 1 except that the amount of maleic anhydride charged was changed to 3 parts by mass and the amount of di-tert-butyl peroxide was changed to 0.5 parts by mass ( PO-3, acid value 5 mg KOH / g-resin, weight average molecular weight 180,000, Tm 80 ° C., ΔH 25 J / g).

Production Example 4
A maleic anhydride-modified propylene-butene copolymer (PO-4, acid value 55 mgKOH / g-resin, weight average) except that the amount of maleic anhydride charged was changed to 30 parts by mass. Molecular weight 40,000, Tm 70 ° C., ΔH 25 J / g) was obtained.

Production Example 5
A maleic anhydride-modified propylene-butene copolymer (with the same procedure as in Production Example 1 except that the amount of maleic anhydride charged was changed to 2 parts by mass and the di-tert-butyl peroxide was changed to 0.5 parts by mass ( PO-5, acid value 3 mg KOH / g-resin, weight average molecular weight 200,000, Tm 80 ° C., ΔH 25 J / g).

(Preparation of main agent 1)
In a 500 ml four-necked flask equipped with a water-cooled reflux condenser and a stirrer, 100 parts by mass of maleic anhydride-modified propylene-butene copolymer (PO-1) obtained in Production Example 1 and 280 parts by mass of methylcyclohexane 120 parts by mass and methyl ethyl ketone were charged, the temperature was raised to 80 ° C. while stirring, and stirring was continued for 1 hour to obtain main agent 1. The solution state is shown in Table 1.

(Preparation of main ingredients 2-12)
The crystalline acid-modified polyolefin and the organic solvent were changed as shown in Table 1, and main agents 2 to 12 were produced in the same manner as main agent 1. Table 1 shows the blending amount and the solution state.

実施例１
主剤１を５００質量部、硬化剤としてグリシジルエーテル型エポキシ樹脂（Ｂ２）であるｊＥＲ（登録商標）１５２を２０質量部、グリシジルアミン型エポキシ樹脂（Ｂ１）であるＴＥＴＲＡＤ（登録商標）−Ｘを２質量部、添加剤として酸無水物モノマー（Ｃ）であるリカシッド（登録商標）ＤＤＳＡを２０質量部配合し、接着剤組成物を得た。ポットライフ性、接着性および耐薬品性の評価結果を表２に示す。

Example 1
500 parts by mass of main agent 1, 20 parts by mass of jER (registered trademark) 152 as glycidyl ether type epoxy resin (B2) as a curing agent, and 2 of TETRAD (registered trademark) -X as glycidylamine type epoxy resin (B1) 20 parts by mass of Ricacid (registered trademark) DDSA which is an acid anhydride monomer (C) as an additive was blended to obtain an adhesive composition. Table 2 shows the evaluation results of pot life, adhesiveness and chemical resistance.

Examples 2-69, Comparative Examples 1-7
Main agents 1 to 12 and each curing agent were changed as shown in Tables 2 to 5, and Examples 2 to 69 and Comparative Examples 1 to 7 were performed in the same manner as in Example 1. A compounding quantity, pot life property, adhesiveness, and chemical resistance are shown to Tables 2-5.

The curing agents used in Tables 2 to 5 are as follows.
<Glycidylamine type epoxy resin (B1)>
N, N, N ′, N′-tetraglycidyl-m-xylenediamine: TETRAD (registered trademark) -X (manufactured by Mitsubishi Gas Chemical Company)
<Glycidyl ether type epoxy resin (B2)>
Phenol novolac type epoxy resin: jER (registered trademark) 152 (manufactured by Mitsubishi Chemical Corporation)
o-Cresol novolac type epoxy resin: YDCN-700-3 (manufactured by Nippon Steel & Sumikin Chemical Co., Ltd.)
<Other curing agents>
Polyisocyanate: Duranate (registered trademark) TPA-100 (manufactured by Asahi Kasei Corporation)
Silane coupling agent: KBM-403 (manufactured by Shin-Etsu Silicone)
<Acid anhydride monomer (C)>
Tetrapropenyl succinic anhydride: Ricacid (R) DDSA
Tetrahydrophthalic anhydride: Ricacid (registered trademark) TH
<Heterocyclic compound (D) having two or more nitrogen>
1-Benzyl-2-methylimidazole: Cureazole (registered trademark) 1B2MZ (manufactured by Shikoku Chemicals)

Analytical measurement and evaluation were performed based on the following methods for each modified polyolefin, main agent and adhesive composition obtained as described above.
Measurement of Acid Value <Crystalline Acid-Modified Polyolefin (A)>
The acid value (mgKOH / g-resin) of the crystalline acid-modified polyolefin (A) in the present invention is the amount of KOH required to neutralize 1 g of the acid-modified polyolefin (A). JIS K0070 ( 1992). Specifically, 1 g of acid-modified polyolefin was dissolved in 100 g of xylene adjusted to a temperature of 100 ° C., and then a 0.1 mol / L potassium hydroxide ethanol solution [trade name “0” was used at the same temperature with phenolphthalein as an indicator. .1 mol / L ethanolic potassium hydroxide solution ", manufactured by Wako Pure Chemical Industries, Ltd.]. At this time, the amount of potassium hydroxide required for the titration was converted to mg, and the acid value (mgKOH / g-resin) was calculated.

<Acid anhydride monomer (C)>
The acid value (mgKOH / g) of the acid anhydride monomer (C) in the present invention is a value calculated by the following formula using the molecular weight (M) of the acid anhydride monomer and the number of succinic anhydride groups (n). . Acid value (mgKOH / g-resin) = [Molecular weight of succinic anhydride (M) × (n) × 2 × Molecular weight of potassium hydroxide × 1000 (mg) / Molecular weight of succinic anhydride]
Molecular weight of succinic anhydride: 100.07, molecular weight of potassium hydroxide: 56.11

Measurement of weight average molecular weight (Mw) The weight average molecular weight in the present invention is a gel permeation chromatograph Alliance e2695 (hereinafter referred to as GPC, standard substance: polystyrene resin, mobile phase: tetrahydrofuran, column: Shodex KF-806 + KF manufactured by Nippon Waters Co. -803, column temperature: 40 ° C., flow rate: 1.0 ml / min, detector: photodiode array detector (wavelength 254 nm = ultraviolet)).

Measurement of melting point and heat of fusion The melting point and heat of fusion in the present invention are increased at a rate of 20 ° C./minute using a differential scanning calorimeter (DSC, manufactured by TA Instruments Japan, Q-2000). It is a value measured from the top temperature and area of the melting peak when heated and melted into a cooled resin and then heated and melted again.

Evaluation of the main agent solution state About the solution states of the main agents 1 to 12, the solution viscosity at 25 ° C. is measured using a Brookfield viscometer TVB-10M (hereinafter also referred to as B-type viscometer) manufactured by Toki Sangyo Co., Ltd. It was evaluated with.
<Evaluation criteria>
○ (Excellent in practical use): Less than 500 mPa · s Δ (Practical use): 500 mPa · s or more and less than 1000 mPa · s × (Unusable): 1000 mPa · s or more or viscosity measurement is impossible due to gelation

Evaluation of pot life property Pot life property refers to the stability of the solution immediately after compounding or after a certain time has elapsed after compounding a crystalline acid-modified polyolefin with a crosslinking agent or curing agent. If the pot life is good, it means that the viscosity of the solution is small and can be stored for a long time. If the pot life is poor, the viscosity of the solution increases (thickens). It means that gelation occurs, application to a substrate becomes difficult, and long-term storage is impossible.
After the pot life properties of the adhesive compositions obtained in Examples 1 to 69 and Comparative Examples 1 to 7 were stored at 25 ° C. and 40 ° C. for 24 hours, the solution viscosity at 25 ° C. was measured using a B-type viscometer. It was evaluated by measuring. The evaluation results are shown in Tables 2-5.
<Evaluation criteria>
○ (Excellent in practical use): Less than 500 mPa · s Δ (Practical use): 500 mPa · s or more and less than 1000 mPa · s × (Unusable): 1000 mPa · s or more or viscosity measurement is impossible due to gelation

Fabrication of laminate of metal substrate and polyolefin resin substrate The metal substrate is made of a chromate-treated aluminum foil (manufactured by Sumi Light Aluminum Foil Co., Ltd., 8079-0, thickness 40 μm). An unstretched polypropylene film (Pyrene (registered trademark) film CT manufactured by Toyobo Co., Ltd., thickness 40 μm) (hereinafter also referred to as CPP) was used.
The adhesive compositions obtained in Examples 1 to 69 and Comparative Examples 1 to 7 were applied to a metal substrate using a bar coater so that the thickness of the adhesive layer after drying was adjusted to 3 μm. The coated surface was dried for 1 minute at 100 ° C. using a hot air dryer to obtain an adhesive layer having a thickness of 3 μm. A polyolefin resin base material is superposed on the surface of the adhesive layer, and bonded at 80 ° C., 0.3 MPa, 1 m / min using a small desktop test laminator (SA-1010-S) manufactured by Tester Sangyo Co., Ltd., and 40 ° C. The laminate was obtained by curing for 120 hours at 50% RH.

  The laminated body obtained as described above was evaluated by the following method.

Evaluation of adhesiveness The laminate was cut into a size of 100 mm x 15 mm, and the adhesiveness was evaluated by a T-type peel test. The evaluation results are shown in Tables 2 and 3.

<T-type peel test>
Based on the test method of ASTM-D1876-61, the peel strength at a tensile speed of 50 mm / min was measured in a 25 ° C. environment using Tensilon RTM-100 manufactured by Orientec Corporation. The peel strength (N / cm) between the metal substrate / polyolefin resin substrate was the average of five test values.

<Evaluation criteria>
☆ (particularly excellent in practical use): 8.0 N / cm or more or CPP breaks material (hereinafter, also simply referred to as “material breakage”) material breakage means that peeling does not occur at the metal substrate / CPP interface, The metal base or CPP is destroyed.
◎ (Excellent in practical use): 7.5 N / cm or more and less than 8.0 N / cm ○ (Practical use): 7.0 N / cm or more and less than 7.5 N / cm × (Not practical): Less than 7.0 N / cm

Evaluation of chemical resistance Chemical resistance by an electrolytic solution test (hereinafter also referred to as electrolytic solution resistance) in order to examine the utility as a packaging material of a lithium ion battery which is one of the usage forms of an aluminum foil and a CPP laminate. ) Was evaluated. The laminate is cut into a size of 100 mm × 15 mm, and water is added to the electrolyte [ethylene carbonate / diethyl carbonate / dimethyl carbonate = 1/1/1 (volume ratio) to which lithium hexafluorophosphate is added]. The sample was added at 300 ppm for 3 days at 85 ° C., or immersed in an electrolyte solution added with 500 ppm of water at 85 ° C. for 5 days. Thereafter, the laminate was taken out, washed with ion-exchanged water, wiped with water with a paper wiper, sufficiently dried in water, cut into a size of 100 mm × 15 mm, and evaluated for chemical resistance by a T-type peel test.

<Evaluation criteria>
☆ (Particularly excellent in practical use): 8.0 N / cm or more or material breakage ◎ (Excellent in practical use): 7.5 N / cm or more and less than 8.0 N / cm ○ (Practical use): 7.0 N / cm or more Less than 5 N / cm x (impractical): less than 7.0 N / cm

  The adhesive composition according to the present invention contains any one of an acid-modified polyolefin, an epoxy resin, an organic solvent, an acid anhydride monomer, and a heterocyclic compound having two or more nitrogen atoms, and thickens even when stored for a long period of time. It is possible to maintain good pot life without causing gelation and to achieve both good adhesion between the metal substrate and the polyolefin resin substrate. Therefore, the laminated structure of the polyolefin resin substrate and the metal substrate formed from the adhesive composition of the present invention is not only used in the fields of home appliance outer panels, furniture materials, building interior members, etc. It can also be widely used as a packaging material (pouch form) for lithium batteries used in telephones, video cameras and the like.

Claims (13)

  A crystalline acid-modified polyolefin (A) having an acid value of 5 to 50 mgKOH / g-resin, a glycidylamine type epoxy resin (B1), a glycidyl ether type epoxy resin (B2), and an organic solvent (E); An adhesive composition containing either one of an acid anhydride monomer (C) and a heterocyclic compound (D) having two or more nitrogen atoms.   The adhesive composition according to claim 1, wherein the glycidylamine type epoxy resin (B1) is an epoxy resin having two or more glycidyl groups in one molecule. The adhesive composition according to claim 1 or 2, wherein the glycidylamine type epoxy resin (B1) is a compound represented by the general formula (1).

(In General Formula (1), R is an aryl group which may have a substituent, X1 and X2 are each independently an alkylene group having 1 to 5 carbon atoms which may have a substituent, m is 1 or 2, and n is 1 or 2.)   The adhesive composition according to any one of claims 1 to 3, wherein the glycidyl ether type epoxy resin (B2) is an epoxy resin having two or more glycidyl groups in one molecule and containing no nitrogen atom. .   The adhesive according to any one of claims 1 to 4, wherein the acid anhydride monomer (C) is a compound having one or more acid anhydride rings in one molecule and having an acid value of 100 mgKOH / g or more. Composition.   The adhesive composition according to any one of claims 1 to 5, wherein the heterocyclic compound (D) having two or more nitrogen atoms is a 5-membered aromatic heterocyclic compound having two or more nitrogen atoms.   Crystalline acid-modified polyolefin (A), glycidylamine-type epoxy resin (B1), glycidyl ether-type epoxy resin (B2), acid anhydride monomer (C) and organic solvent (E) A) 0.01 to 20 parts by mass of glycidylamine type epoxy resin (B1), 1 to 50 parts by mass of glycidyl ether type epoxy resin (B2), and 1 acid anhydride monomer (C) with respect to 100 parts by mass The adhesive composition according to any one of claims 1 to 6, comprising -50 parts by mass and 80-1000 parts by mass of an organic solvent (E).   Crystalline acid-modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), heterocyclic compound (D) having two or more nitrogen and organic solvent (E), 0.01 to 20 parts by mass of glycidylamine type epoxy resin (B1), 1 to 50 parts by mass of glycidyl ether type epoxy resin (B2), and 2 parts of nitrogen with respect to 100 parts by mass of crystalline acid-modified polyolefin (A) The adhesive composition according to any one of claims 1 to 6, comprising 0.01 to 5 parts by mass of at least one heterocyclic compound (D) and 80 to 1000 parts by mass of an organic solvent (E).   Crystalline acid-modified polyolefin (A), glycidylamine type epoxy resin (B1), glycidyl ether type epoxy resin (B2), acid anhydride monomer (C), heterocyclic compound (D) having two or more nitrogen and organic Contains solvent (E), 0.01 to 20 parts by mass of glycidylamine type epoxy resin (B1) and 1 glycidyl ether type epoxy resin (B2) per 100 parts by mass of crystalline acid-modified polyolefin (A) -50 parts by mass, 1-50 parts by mass of an acid anhydride monomer (C), 0.01-5 parts by mass of a heterocyclic compound (D) having two or more nitrogen atoms, and 80-1000 of an organic solvent (E). The adhesive composition according to any one of claims 1 to 6, which is contained in parts by mass.   The organic solvent (E) is a mixed liquid of the solvent (E1) and the solvent (E2), and the solvent (E1) is composed of an aromatic hydrocarbon, an aliphatic hydrocarbon, an alicyclic hydrocarbon, and a halogenated hydrocarbon. One or more solvents selected from the group, wherein the solvent (E2) is one or more solvents selected from the group consisting of alcohol solvents, ketone solvents, ester solvents and glycol ether solvents, It is (E1) / solvent (E2) = 50-97 / 50-3 (mass ratio), The adhesive composition in any one of Claims 1-9.   The adhesive composition according to any one of claims 1 to 10, which is used for adhesion between a polyolefin resin substrate and a metal substrate.   A laminate of a polyolefin resin substrate and a metal substrate bonded by the adhesive composition according to claim 1. The packaging material for lithium ion batteries containing the laminated body of Claim 12 as a structural member.