JPH04255780A - Resin composition for tacky agent - Google Patents

Abstract

PURPOSE:To obtain a resin composition for tacky agent having excellent tacky characteristics such as tacky force or cohesive force, good bonding property to an inorganic material and excellent miscibility with inorganic filler and inorganic fiber. CONSTITUTION:A resin composition for tacky agent obtained by blending a polyester oligomer obtained by reacting a cyclic acid anhydride with an epoxide with a tacky acrylic polymer, polyisocyanate and silane coupling agent. Thereby the resin composition for tacky agent having good tacky characteristic such as tacky force or cohesive force and balance thereof as well as excellent suitability to inorganic material is obtained.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention has excellent adhesive properties such as adhesive force and cohesive force, and has good adhesion to inorganic materials.
The present invention relates to a resin composition for adhesives that has excellent miscibility with inorganic fillers and inorganic fibers.

0002

[Prior Art] Acrylic adhesives that have been commonly used in the past are mainly made of alkyl esters of acrylic acid or methacrylic acid, such as butyl acrylate and 2-ethylhexyl acrylate, whose glass transition temperature is below room temperature. In order to increase cohesion and adhesive strength, we copolymerized monomers that raise the glass transition temperature of polymers, such as vinyl acetate and acrylonitrile, and monomers that have functional groups such as hydroxyl, carboxyl, and amide groups. The main component is polymer.

[0003] However, it is difficult to balance cohesive force and adhesive force or to provide heat resistance using only polymers, and in actual adhesives, phenolic resins, rosin resins, petroleum resins, or modified resins of these are used. The cohesive force is improved by adding a tackifier such as polyisocyanate or by reacting a crosslinking agent such as polyisocyanate with a functional group in the acrylic polymer.

[0004] Therefore, the previous invention (Japanese Patent Application No. 02-26918)
5), we have developed a resin composition with excellent adhesive properties such as adhesive strength and cohesive strength, but it does not have good adhesion to inorganic materials such as ceramics, glass, and metals, and has poor compatibility with inorganic fillers and inorganic fibers. was also insufficient.

[0005]

[Problems to be Solved by the Invention] The present invention improves the above-mentioned problems of conventional resin compositions for pressure-sensitive adhesives, namely their poor suitability for inorganic materials, by adding a silane coupling agent. The present invention provides a resin composition for pressure-sensitive adhesives that has excellent adhesive properties such as adhesive force and cohesive force, has good adhesion to inorganic materials, and has excellent miscibility with inorganic fillers and inorganic fibers.

[0006]

[Means for Solving the Problems] The present invention provides a polyester oligomer (A), a sticky acrylic polymer (B), and a polyisocyanate (C) obtained using a cyclic acid anhydride (a) and an epoxide (b) as main raw materials. , a silane coupling agent (D).

[0007] In the present invention, polyester oligomer (
When obtaining A), in order to smooth the initial reaction and adjust the molecular weight of the polyester oligomer (A) to be produced,
It is necessary to use a compound that has a functional group that serves as a starting point for the reaction, such as a hydroxyl group or a primary, secondary, or tertiary amino group. Among these, it is generally preferable to use a compound having a hydroxyl group in view of the properties of the raw materials and products and ease of control during the reaction.

Compounds having hydroxyl groups include methanol, ethanol, 1-propanol, 2-propanol,
Aliphatic saturated alcohols such as 1-butanol, 2-butanol, pentanol, hexanol, aliphatic unsaturated alcohols such as allyl alcohol, crotyl alcohol, propargyl alcohol, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, N-
(meth)acrylates with hydroxyl groups such as methylol acrylamide or (meth)acrylamide; alicyclic alcohols such as cyclopentanol and cyclohexanol; aromatic alcohols such as benzyl alcohol and cinnamyl alcohol; furfuryl alcohol and tetrahydrofurfuryl. Heterocyclic alcohols such as alcohol, ethylene glycol, propylene glycol, 1,4
- Diols such as butylene glycol, butenediol, hexanediol, cyclohexanediol, bisphenol A, diethylene glycol, triols such as glycerin, trimethylolpropane, phenol, o
- Any compound having an alcoholic or phenolic hydroxyl group such as phenols such as -cresol, m-cresol, and p-cresol may be used.

However, among these, the above-mentioned diol and 2
-Hydroxy-n-butyric acid, 3-hydroxy-n-butyric acid,
Compounds having both a carboxyl group and a hydroxyl group such as p-hydroxybenzoic acid, hydroxypivalic acid, salicylic acid, vanillic acid, 12-hydroxystearic acid, or ethanolamine, 1-amino-2-propanol, o-aminophenol, m- aminophenol, p
Compounds having two or more functional groups, such as compounds having both an amino group and a hydroxyl group such as -aminophenol, are preferred.

[0010] In the present invention, the cyclic acid anhydride (a) is an intramolecular anhydride of a polycarboxylic acid, such as a saturated or unsaturated aliphatic polycarboxylic acid anhydride, an alicyclic polycarboxylic acid anhydride. , aromatic polyhydric carboxylic acid anhydrides, etc., or those in which a part of these is substituted with a saturated or unsaturated hydrocarbon group, an aromatic ring group, a halogen atom, a heterocyclic group, etc. Specific examples of these include: are succinic anhydride, phthalic anhydride, maleic anhydride, itaconic anhydride, glutaric anhydride, dodecenylsuccinic anhydride, chlorendic anhydride, pyromellitic anhydride, trimellitic anhydride, cyclopentanetetracarboxylic dianhydride, Hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, tetramethylene maleic anhydride, tetrahydrophthalic anhydride, methyltetrahydrophthalic anhydride, endomethylenetetrahydrophthalic anhydride, methylendomethylenetetrahydrophthalic anhydride, 5-(2,5 -dioxotetrahydroxyfuryl)-3-methyl-3-cyclohexene-1,2
-Dicarboxylic anhydride, methylnadic anhydride, benzophenonetetracarboxylic anhydride, glycerol tris (
These include ethylene glycol bis(anhydrotrimellitate) and ethylene glycol bis(anhydrotrimellitate). Among these, it is preferable to use dicarboxylic acid or tricarboxylic acid anhydrides that do not form a crosslinked structure.

In the present invention, the epoxide (b) includes epichlorohydrin, phenylglycidyl ether, styrene oxide, cyclohexene oxide, butene oxide, glycidyl (meth)acrylate, glycidyl cinnamate, allyl glycidyl ether, vinylcyclohexene monoepoxide, 1, Examples include 3-butadiene monoepoxide, which may be substituted with saturated or unsaturated hydrocarbon groups, aromatic ring groups, halogen atoms, heterocyclic groups, etc.

[0012] Polyester oligomer (A
) is obtained. The reaction is carried out in the presence or absence of a suitable solvent using a tertiary amine such as N,N-dimethylbenzylamine, triethylamine, tributylamine, N,N-diethylaniline, N,N-dimethylaniline, etc. as necessary. When a compound with an ethylenically unsaturated group is used as a catalyst, hydroquinone, hydroquinone monomethyl ether, tert.
-It can be carried out in a state in which a radical polymerization inhibitor such as butylcatechol or p-benzoquinone is added.

In the reaction, the hydroxyl group of the compound having a hydroxyl group and the acid anhydride group of the cyclic acid anhydride (a) first react preferentially, and then the carboxyl group produced by this reaction reacts with the epoxide (b). Reacts with epoxy groups to produce secondary hydroxyl groups. Furthermore, the resulting hydroxyl group and cyclic acid anhydride (a
) can be reacted with the acid anhydride group, and the same reactions as above can proceed in sequence.

In this reaction, by adjusting the amounts of the cyclic acid anhydride (a) and epoxide (b) to be reacted with respect to the amount of the compound having a hydroxyl group, the desired compound having a hydroxyl group as a terminal can be obtained. Polyester oligomers (A) of length can be made.

[0015] When the cyclic acid anhydride (a) is a dicarboxylic acid anhydride, the ratio of each compound is 1 to 20 mol of the cyclic acid anhydride (a) to 1 mol of the compound having a hydroxyl group, and It is preferable that the epoxide (b) is reacted in a proportion of 1 to 20 moles, and the cyclic acid anhydride (a) and the epoxide (b) are reacted in a substantially equimolar proportion. When the cyclic acid anhydride (a) is a tricarboxylic acid, the ratio of 1 to 10 moles of the cyclic acid anhydride (a) and 1 to 20 moles of the epoxide (b) per 1 mole of the compound having a hydroxyl group; , approximately 1 mol of epoxide (b) to 1 mol of cyclic acid anhydride (a)
It is preferable to react at a ratio of ~2 moles.

Cyclic acid anhydride (a) or epoxide (b) reacted with 1 mole of a compound having a hydroxyl group
If the amount is less than 1 mol, the resulting polyester oligomer (A) may have a low molecular weight or a compound having a hydroxyl group may remain, making it impossible to obtain the necessary properties. Conversely, if the amount of cyclic acid anhydride (a) or epoxide (b) is 2
If the amount exceeds 0 mol, it becomes difficult to control the reaction or the molecular weight becomes too high, making it difficult to obtain the necessary properties.

The polyester oligomer obtained here (
As mentioned above, for A), a wide variety of compounds can be used as raw materials for compounds having hydroxyl groups, cyclic acid anhydrides (a), and epoxides (b), and by changing their proportions, it is possible to obtain compounds with relatively low molecular weights. You can make any length you want. Moreover, it is also possible to use a mixture of two or more types of each compound. Therefore, oligomers with a wide variety of properties can be created depending on the purpose of use. Therefore, when adding oligomers to adhesives, the desired properties can be imparted to the composition by changing the type of oligomer and its blending ratio depending on the application, ranging from those that act as tackifiers to those that act like fillers. It is possible to give.

In the present invention, the adhesive acrylic polymer (B) is one having functional groups such as a hydroxyl group, a tertiary amino group, a carboxyl group, an amide group, an N-substituted amide group, and a nitrile group, and is generally used as an adhesive. It is used as an acrylic resin. Further, even if the polymer alone has poor adhesiveness, a polymer that exhibits good adhesive properties by adding polyester oligomer (A) or other resin can be used as the polymer (B) of the present invention. Acrylic polymers having these functional groups are composed of one or more, preferably two or more, monomers having a hydroxyl group, a tertiary amino group, a carboxyl group, an amide group, an N-substituted amide group, a nitrile group, etc., and an alkyl group. These include copolymers with monomers such as (meth)acrylate, vinyl acetate, vinyl propionate, vinyl ether, and styrene.

Examples of monomers having a hydroxyl group include 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 3-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)acrylate, and N-methylolacrylamide. , allyl alcohol, etc. Examples of monomers having a tertiary amino group include dimethylaminoethyl (meth)acrylate, diethylaminoethyl (meth)acrylate, and dimethylaminopropyl (meth)acrylamide. Examples of monomers having a carboxyl group include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, and citraconic acid. Examples of monomers having an amide group or an N-substituted amide group include acrylamide, methacrylamide, and N-methyl (
meth)acrylamide, N-ethyl(meth)acrylamide, N-methoxymethyl(meth)acrylamide, N
Examples include -ethoxymethyl (meth)acrylamide, N-propoxymethyl (meth)acrylamide, N-butoxymethyl (meth)acrylamide, N-tert-butylacrylamide, N-octylacrylamide, diacetone acrylamide, and the like. Monomers with nitrile groups include acrylonitrile, methacrylonitrile,
Examples include crotononitrile and fumaronitrile. Also,
Examples of alkyl (meth)acrylates include alkyl (meth)acrylates such as methyl (meth)acrylate, ethyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, and octyl (meth)acrylate. In addition, cyclohexyl (meth)acrylate, benzyl (meth)acrylate, tetrahydrofurfuryl (meth)acrylate, etc., and alkyl (meth)acrylates in which the alkyl group is substituted with an aromatic ring group, a heterocyclic group, a halogen atom, etc. Monomers used in the synthesis of acrylic polymers can also be used in the synthesis of the polymers of the present invention.

The reaction is a normal radical polymerization, and there are no restrictions on the reaction method, and it can be carried out using known polymerization methods such as solution polymerization, bulk polymerization, and emulsion polymerization. Solution polymerization is preferred because it allows the process to proceed directly to the next operation. Any solvent may be used as long as it dissolves the resin of the present invention, such as methyl ethyl ketone, methyl isobutyl ketone, toluene, cellosolve, ethyl acetate, butyl acetate, etc., and it may be used alone or in combination of multiple solvents. In addition, polymerization initiators used during polymerization reactions include organic peroxides such as benzoyl peroxide, acetyl peroxide, methyl ethyl ketone peroxide, and lauroyl peroxide, and azo initiators such as azobisisobutyronitrile. There are no particular restrictions.

Polyester oligomer (A) and adhesive acrylic polymer (B) obtained by each reaction
A resin composition can be obtained by mixing. For mixing, it is sufficient to stir the materials at room temperature until they become apparently homogeneous, but in order to further improve the state of mutual mixing, heating and stirring may be performed at a temperature below the boiling point of the solvent.

The composition obtained as described above contains the polyester oligomer (A) and the adhesive acrylic polymer (A).
It is thought that because the compatibility with B) is not very good, it probably has a microphase-separated structure. This can be seen from the fact that some solutions, especially those with high concentrations, or when this composition is coated onto a film, produce white turbidity. However, it does not separate when left standing and remains uniform. In general, when oligomers with good compatibility are added, the cohesive force, especially at high temperatures, decreases even though the adhesion can be improved. In the case of a resin composition with a phase-separated structure,
Although it is greatly influenced by the composition of the polyester oligomer (A) to be added, it is characterized in that it generally does not reduce the cohesive force. In particular, when oligomers with high viscosity and softening points are used, they exhibit an effect similar to that of a filler and can significantly improve cohesive force.

In order to improve the adhesive properties and in particular to increase the cohesive strength, polyisocyanates (C) are also added to partially crosslink the adhesive acrylic polymer (B). Such polyisocyanates include tolylene diisocyanate, 4,4'-diphenylmethane diisocyanate,
Hexamethylene diisocyanate, m-xylene diisocyanate, p-xylene diisocyanate, 1,5-
Diisocyanates such as naphthalene diisocyanate, isophorone diisocyanate, lysine diisocyanate, hydrogenated 4,4'-diphenylmethane diisocyanate, and hydrogenated tolylene diisocyanate, or double-terminated isocyanate adducts of these with glycols or diamines, or mixtures thereof. If necessary, tri- or higher functional polyisocyanates such as triphenylmethane triisocyanate and polymethylene polyphenylisocyanate can also be used in combination with diisocyanates. Here, when the acrylic polymer (B) has two or more types of functional groups, due to the difference in reactivity with the polyisocyanate (C), it is divided into functional groups that mainly contribute to crosslinking and functional groups that remain, resulting in adhesiveness. The cohesive force can be significantly improved while maintaining sufficient properties. Moreover, since the polyester oligomer (A) also has one or more functional groups in one molecule, it can be expected that this will react with the polyisocyanate (C) and exhibit the effect of increasing cohesive force.

Furthermore, a silane coupling agent (D) is added to improve adhesion to ceramics, glass, metals, etc., and to improve miscibility with inorganic fillers and inorganic fibers. The silane coupling agent (D) is
Generally, it is a compound represented by the chemical formula of X to Si(OR)3, and has two or more different functional groups in the molecule. Among these, X is a group that reacts with organic substances such as vinyl group, acrylic group, methacrylic group, amino group, epoxy group, mercapto group, and the other OR is a methoxy group, ethoxy group,
A hydrolyzable group such as a hydroxy group. Also, a hydrogen atom or a halogen atom may be used instead of OR. In any case, it functions as a binder between organic and inorganic materials.

Among these, vinylsilane, epoxysilane, methacrylsilane, aminosilane, and mercaptosilane can be used, but according to the inventor's experimental results, vinylsilane, epoxysilane, and methacrylsilane are particularly effective in improving the above-mentioned performance. It has been confirmed that there is.

Examples of the vinylsilane include vinyltrichlorosilane, divinyldichlorosilane, vinyldimethylchlorosilane, vinyltrimethoxysilane, vinyltriethoxysilane, and vinyltris-(β-methoxyethoxy).
Silane, p-allylphenylethyldichlorosilane, p
-Vinylphenyltrichlorosilane, allylmethyldichlorosilane, vinyldiphenylchlorosilane and the like. Examples of the epoxysilane include γ-glycidoxypropyltrimethoxysilane, γ-glycidoxypropylmethyldimethoxysilane, and β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane. Examples of methacrylsilane include γ-methacryloxypropyltrimethoxysilane and γ-methacryloxypropylmethyldimethoxysilane. One or more of these are blended to form a pressure-sensitive adhesive resin composition.

[0027] The resin composition of the present invention may contain pigments, dyes, inorganic fillers,
Organic solvents, metal powders such as silver powder, copper powder, and nickel powder, carbon black, graphite, oligomers other than the aforementioned polyester oligomer (A), and tackifiers such as xylene resin and rosin resin can be added. .

[0028] The resin composition of the present invention can be used in plastic films,
It is coated on films, sheets, tapes, etc. such as paper, cellophane, cloth, non-woven fabrics, and metal foils, or processed with low-adhesive resins such as silicone-treated paper or cloth, polyethylene terephthalate film laminated paper, etc. Coat it on a highly releasable film, sheet, or tape such as paper, cloth, metal foil, or plastic film, remove the organic solvent by drying if necessary, cut it if necessary, and apply it on both sides or Formed into a single-sided adhesive sheet or tape. In addition, for reinforcement and impact mitigation, linings are made of nonwoven fabrics such as rayon and nylon, fabrics such as cheesecloth, paper, cellophane, plastic films such as polyethylene terephthalate film, and foams such as metal foil, urethane, and acrylic. or these cloths,
It is also possible to use films, foams, etc. as core materials by coating or impregnating them with the resin composition of the present invention.

[0029]

EXAMPLES The present invention will be explained below with reference to Examples. In the examples, "part" means part by weight, and "%" means percent by weight.

Synthesis of polyester oligomer

0031
] Oligomer 1 p-hydroxybenzoic acid
4.3 parts hexahydrophthalic anhydride
48.5 parts phenyl glycidyl ether
47.2 parts N,N-dimethylbenzylamine 0.9 parts ethyl acetate
25.0
The above compositions were mixed and reacted in an air atmosphere at 80° C. for 10 hours. After cooling, 125 parts of ethyl acetate was added to obtain a solution of polyester oligomer 1 (solid content: 40%).

Oligomer 2 Ethylene glycol
2.0 parts hexahydrophthalic anhydride
51.0 parts glycidyl methacrylate
47.0 parts N,N-dimethylbenzylamine 0.9 parts Hydroquinone 0
．． 2 parts ethyl acetate
25.0 parts of the above composition were mixed and reacted in an air atmosphere at 80° C. for 10 hours. After cooling, 125 parts of ethyl acetate was added to obtain a solution of polyester oligomer 2 (solid content: 40%).

Oligomer 3 p-hydroxybenzoic acid
4.5 parts hexahydrophthalic anhydride
49.7 parts glycidyl methacrylate
45.8 parts N,N-dimethylbenzylamine 0.9 part hydroquinone
0.2
ethyl acetate
25.0 copies

The above compositions were mixed and reacted in an air atmosphere at 80° C. for 10 hours. After cooling, 125 parts of ethyl acetate was added to obtain a solution of polyester oligomer 3 (solid content: 40%).

Synthesis of acrylic polymer

Polymer 1 Butyl acrylate
93.5 parts acrylic acid
1.4 parts 2-hydroxyethyl methacrylate 5.1 parts azobisisobutyronitrile 0.2 parts ethyl acetate
150.0 parts To 125 parts of the mixture with the above composition heated to 80°C, 125 parts of the above mixture with the same composition was added dropwise,
After the dropwise addition was completed, the mixture was heated under reflux for 12 hours and cooled to obtain a solution of acrylic polymer 1 (solid content: 40%).

Polymer 2 Butyl acrylate
92.0 parts acrylamide
2.8 parts 2-hydroxyethyl methacrylate 5.2 parts azobisisobutyronitrile 0.2 parts ethyl acetate
150.0 copies

To 125 parts of the mixture having the above composition heated to 80°C, 125 parts of the above mixture having the same composition was added dropwise, and after the addition was completed, the mixture was heated to reflux for 12 hours, cooled,
A solution of acrylic polymer 2 (solid content 40%) was obtained.

[0039]

[Example 1] 27.3 parts of a solution of oligomer 1 and 72.7 parts of a solution of polymer 1 were thoroughly mixed, and further 0.3 part of tolylene diisocyanate and 0.1 part of γ-glycidoxypropyltrimethoxysilane were mixed. was added to obtain a pressure-sensitive adhesive resin composition. The resulting pressure-sensitive adhesive resin composition was applied onto two pieces of release paper so that the thickness after drying was 30 μm.
After drying at 0° C. for 3 minutes, each was pasted on both sides of a 50 μm thick rayon nonwoven fabric and impregnated with resin to obtain a double-sided adhesive sheet. This was further aged at 50° C. for 3 days, a 50 μm polyethylene terephthalate film was attached to one side, and the resulting pressure-sensitive adhesive sheet was measured for peel adhesion, tack, and holding power. The results are shown in Table 1. Note that the measurements were performed as follows.

(1) Peel Adhesive Strength The adhesive sheet obtained was cut to a width of 25 mm, and was pasted on a 10 mm thick glass plate whose surface had been cleaned with toluene.
After standing for a minute, the adhesive strength was measured at 180° peeling at a peeling rate of 300 mm/min at 25° C. and 65% relative humidity.

(2) The obtained adhesive sheet was set on a slope with a tack angle of 30 degrees, and the run-up distance was 10 cm under conditions of 25° C. and 65% relative humidity.
, roll the stainless steel ball, sticky side 10
The number of the largest ball that stopped within cm was measured. The ball numbers are 32 times the number of the 31 types of ball names, ranging from 1/16 to 1.

(3) Cut the obtained adhesive sheet into pieces with a width of 25 mm and a length of 100 mm.
The part m was attached to a glass plate with a thickness of 10 mm that had been cleaned with toluene, and the time (seconds) until the adhesive sheet fell from the glass plate at a predetermined temperature and a load of 1 kg was measured.

[0043]

[Example 2] 37.7 parts of a solution of oligomer 2 and 62.3 parts of a solution of polymer 2 were thoroughly mixed, and 0.5 part of Coronate L (polyisocyanate manufactured by Nippon Polyurethane Industries, Ltd.) and γ-glyceride were added. 0.1 part of sidoxypropyltrimethoxysilane was added to obtain a resin composition for an adhesive. The resulting pressure-sensitive adhesive resin composition was placed on a polyethylene terephthalate film with a thickness of 50 μm to a thickness of 30 μm after drying.
It was coated to a thickness of μm and dried at 60° C. for 3 minutes to obtain a pressure-sensitive adhesive sheet. Regarding the obtained adhesive sheet, Example 1
Peel adhesion, tack, and holding power were measured in the same manner as above. The results are shown in Table 1.

[0044]

[Example 3] 38.0 parts of a solution of oligomer 3 and 62.0 parts of a solution of polymer 1 were thoroughly mixed, and further 0.5 part of tolylene diisocyanate and 0.1 part of γ-glycidoxypropyltrimethoxysilane were mixed. was added to obtain a pressure-sensitive adhesive resin composition. A double-sided adhesive sheet was obtained from the obtained adhesive resin composition in the same manner as in Example 2, and measurements were performed. The results are shown in Table 1.

[0045]

[Comparative Example 1] A pressure-sensitive adhesive sheet was obtained by coating on a film in the same manner as in Example 1 without adding any 0.1 part of γ-glycidoxypropyltrimethoxysilane, and measurements were performed.

[0046]

Comparative Example 2 A pressure-sensitive adhesive sheet was obtained by coating on a film in the same manner as in Example 2, without adding any 0.1 part of γ-glycidoxypropyltrimethoxysilane, and measurements were performed.

[0047]

[Comparative Example 3] A pressure-sensitive adhesive sheet was obtained by coating on a film in the same manner as in Example 3 without adding any 0.1 part of γ-glycidoxypropyltrimethoxysilane, and measurements were performed. The above results are shown in Table 1.

[0048]

[Table 1]

[0049]

Effects of the Invention As shown, the resin composition of the present invention has a peel adhesion of 2000 g/25 mm or more, a tack of 7 or more, a holding power of 24 hours or more, and has excellent adhesive properties and balance thereof. There is. Furthermore, the adhesion to inorganic materials is improved by adding a silane coupling agent. As described above, the present invention has made it possible to obtain a resin composition for adhesives that has good adhesive force, cohesive force, and a good balance thereof, and also has excellent adhesiveness to inorganic materials.

Claims (1)

[Claims] Claim 1: A polyester oligomer obtained by reacting a cyclic acid anhydride (a) and an epoxide (b) (
A resin composition for an adhesive, comprising: A), an adhesive acrylic polymer (B), a polyisocyanate (C), and a silane coupling agent (D).