JP2006124514A - Resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resin composition curable at ≤100°C, having high adhesive strength and excellent in adhesion reliability by improving stability at room temperatures in one component type heat curing adhesives used in adhesive application requiring heat resistance. <P>SOLUTION: The resin composition comprises (A) a compound having two or more glycidyl groups in one molecule, (B) a compound expressed by general formula (1), (C) a compound having an acryloyl group and (D) a filler. In the general formula (1), R<SP>4</SP>expresses methyl. The molar ratio of the acryloyl group of the compound (C) to the compound (B) ranges from 1:0.01 to 1:0.5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a low-temperature curable resin composition.

For adhesive applications that require heat resistance, a thermosetting adhesive is usually used. Heat-curing adhesive is a type that disperses high molecular weight components in a solvent and removes the solvent during heat-curing, and heat-curing using a thermosetting resin such as epoxy resin, phenol resin, acrylic resin, etc. Some of them have a high molecular weight by reaction or a combination of these. Here, there are increasing cases where curing at a lower temperature is desired from the viewpoint of heat resistance or energy saving of the adherend, but in order to cure at a lower temperature, a solvent having a lower boiling point is used or a lower temperature is required. It is necessary to use a thermosetting resin that reacts with The low boiling point solvent is easy to dry even at room temperature and needs to be joined immediately after being applied. In addition, the low boiling point solvent itself has many problems such as flammability and influence on the human body. On the other hand, in the case of a thermosetting resin capable of reacting at a low temperature, the reaction proceeds in a short time even at room temperature. Mixing immediately before use is complicated, and there is a problem in application to bonding applications where high reliability is required because there is concern about adverse effects of bonding reliability such as mixing mistakes and insufficient mixing. (For example, refer to Patent Document 1.) As described above, there is no one-pack type adhesive that can be bonded at a temperature of 100 ° C. or lower and has a high adhesive strength that sufficiently satisfies the requirements.
JP 2000-303053 A

The present invention provides a resin composition having a high adhesive strength that can be made into one liquid and can be cured at a temperature of 100 ° C. or lower.

Such an object is achieved by the present invention described in the following [1] to [3].
[1] A resin composition comprising (A) a compound having two or more glycidyl groups in one molecule, (B) a compound represented by the general formula (1), (C) a compound having an acryloyl group, and (D) a filler. R ⁴ in the general formula (1) is a methyl group, and the molar ratio of the acryloyl group of the compound (C) to the compound (B) is from 1: 0.01 to 1: 0.5. A resin composition characterized.

Ｒ^１：−Ｈまたは炭素数２０以下のアルキル基
Ｒ^２、Ｒ^３：−Ｈ、メチル基
Ｒ^４：有機基

R ¹ : —H or an alkyl group having 20 or less carbon atoms R ² , R ³ : —H, methyl group R ⁴ : organic group

[2] The resin composition according to item [1], wherein R ^{1 of the} compound represented by the general formula (1) is a methyl group.
[3] A resin composition comprising (A) a compound having two or more glycidyl groups in one molecule, (B) a compound represented by the general formula (1), (C) a compound having an acryloyl group, and (D) a filler. The compound represented by the general formula (1) is a reaction product of the compound represented by the general formula (2) and the compound having an acryloyl group, and the mole of the acryloyl group of the compound (C) with respect to the compound (B). A resin composition having a ratio of 1: 0.01 to 1: 0.5.

Ｒ^１：−Ｈまたは炭素数２０以下のアルキル基
Ｒ^２、Ｒ^３：−Ｈ、メチル基

R ¹ : —H or an alkyl group having 20 or less carbon atoms R ² , R ³ : —H, methyl group

According to the present invention, it is possible to provide a resin composition having a high adhesive strength that can be cured at a low temperature of 100 ° C. or less while being a one-component type.

In general, imidazoles are used as a curing agent in order to make an epoxy resin into one component. When crystalline imidazoles are dispersed, when the melting point is not so high, the reaction proceeds gradually because it dissolves in the epoxy resin, and when the melting point is high, a high temperature is required for curing, so that the temperature is 100 ° C. or less. When curing with, it is difficult to balance curability and storage stability. Therefore, in the present invention, the stability at room temperature is improved by simultaneously using an imidazole compound having no active hydrogen at the 1-position represented by the general formula (1) and a compound having an acryloyl group, and good low-temperature curing is achieved. It was found that it is possible to maintain sex. As an imidazole compound having no active hydrogen at the 1-position shown in the general formula (1), for example, a reaction of a commercially available 1,2-dimethylimidazole or a compound shown in the general formula (2) with a compound having an acryloyl group It is possible to use things. Here, the reaction between imidazole having an active hydrogen at the 1-position and an acryloyl group proceeds at a relatively low temperature. However, when there is a phenyl group at the 2-position, the reactivity is extremely low and the reaction cannot be used. R ¹ is limited to —H or an alkyl group having 20 or less carbon atoms. Specific examples include imidazole, 2-undecylimidazole, 2-heptadecylimidazole, and the like, and preferably 2-methylimidazole and 2-ethyl-4-methylimidazole.

  Examples of the compound having an acryloyl group that can be used include methyl acrylate, ethyl acrylate, n-butyl acrylate, isobutyl acrylate, tertiary butyl acrylate, isodecyl acrylate, lauryl acrylate, tridecyl acrylate, cetyl acrylate, stearyl acrylate, Octyl acrylate, isoamyl acrylate, isostearyl acrylate, behenyl acrylate, other alkyl acrylates, cyclohexyl acrylate, 2-ethylhexyl acrylate, tertiary butyl cyclohexyl acrylate, tetrahydrofurfuryl acrylate, benzyl acrylate, phenoxyethyl acrylate, isobornyl acrylate, glycerol Monoacrylate Glycerol diacrylate, trimethylolpropane triacrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, dimethylaminoethyl acrylate, diethylaminoethyl acrylate, neopentyl glycol acrylate, ethylene glycol diacrylate, propylene glycol di Acrylate, 1,4-butanediol diacrylate, 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, 1,3-butanediol diacrylate, 1,10-decanediol diacrylate, hydroxypivalic acid Neopentyl glycol diacrylate, polyethylene glycol diacrylate, polypropylene glycol mono Chryrate, polypropylene glycol diacrylate, tetramethylene glycol monoacrylate, tetramethylene glycol diacrylate, polytetramethylene glycol monoacrylate, polytetramethylene glycol diacrylate, methoxyethyl acrylate, butoxyethyl acrylate, ethoxydiethylene glycol acrylate, methoxypolyalkylene glycol mono Acrylate, Octoxy polyalkylene glycol monoacrylate, Lauroxy polyalkylene glycol monoacrylate, Stearoxy polyalkylene glycol monoacrylate, Allyloxy polyalkylene glycol monoacrylate, Nonylphenoxy polyalkylene glycol monoacrylate, Polyalkylene oxide modification Bisphenol A diacrylate, 2-hydroxy-3-phenoxypropyl acrylate, N, N'-methylenebisacrylamide, N, N'-ethylenebisacrylamide, 1,2-diacrylamide ethylene glycol, diacryloyloxymethyltricyclo Decane, 2-acryloyloxyethyl succinic acid, 2-acryloyloxyethyl hexahydrophthalic acid, 2-acryloyloxyethyl-2-hydroxypropyl phthalate, 2-hydroxy-3-acryloyloxypropyl methacrylate, N-acrylic Examples include leuoxyethyl maleimide, N-acryloyloxyethyl hexahydrophthalimide, and N-acryloyloxyethyl phthalimide.

The present invention is used so that the molar ratio of the acryloyl group of the compound (C) having an acryloyl group to the compound (B) represented by the general formula (1) is 1: 0.01 to 1: 0.5. . This is because if the acryloyl group is less than this, the storage stability at room temperature is poor, and if it is more than this, the curability deteriorates.
When the reaction product of the compound represented by the general formula (2) and the compound having an acryloyl group is used as the compound (B) represented by the general formula (1), the compound represented by the general formula (2) at the time of the reaction It can be adjusted by the compounding ratio of the compound having an acryloyl group and is obtained by stirring at 50 to 80 ° C. in a state where the compound having an acryloyl group is excessive in the functional group ratio. Here, the unreacted acryloyl group can be measured by proton NMR (hereinafter referred to as H-NMR) of the reaction product (A) dissolved in deuterated DMSO (dimethyl sulfoxide). For example, when 2-methylimidazole and isooctyl acrylate are used as raw materials for the reactant (B), it is confirmed on the H-NMR chart that no peak based on active hydrogen at the 1-position of imidazole is observed near 12 ppm. The integrated value of the 4- or 5-position proton peak of the imidazole ring appearing near 7 ppm and 6.7 ppm and the unreacted acryloyl group peak appearing near 5.9 to 6.4 ppm (based on three types of protons) It can be obtained from the ratio of the integrated values of the three peaks).

  In the present invention, the compound (A) having two or more glycidyl groups in one molecule is used. The reason why the glycidyl group is necessary is to react the compound (B) as a curing agent, and the reason why two or more glycidyl groups are required in one molecule is to take a three-dimensional cross-linked structure by the reaction and to exhibit good heat resistance. Such compounds include bisphenol A, bisphenol F, biphenol, etc. or bifunctional compounds obtained by epoxidizing these derivatives, trihydroxyphenylmethane skeleton, trifunctional compounds having an aminophenol skeleton, phenol novolak, cresol novolak, etc. Examples include, but are not limited to, epoxidized polyfunctional ones. If there are two or more glycidyl groups in one molecule, it can be used, but preferably two or three, and if the number of functional groups is larger than this, the viscosity of the resin composition becomes too high and the workability becomes high. This is because it gets worse. It is also possible to use a reactive diluent as long as the heat resistance is not impaired. A desirable ratio of compound (B) to compound (A) is 10% by weight to 50% by weight. If the amount is less than this, the curability may be insufficient, and if the amount is more than this, the storability may be concerned, and the mechanical strength of the cured product may be deteriorated. More preferably, it is 15 to 40% by weight.

Although it does not specifically limit as a filler (D), Metal particles, such as an insulating thing, such as a silica, an alumina, a boron nitride, an aluminum nitride, a titanium oxide, silver, gold | metal | money, aluminum, copper, palladium, tin, nickel, are included. It is possible to use. A preferable content of the filler is 20% by weight to 90% by weight in the resin composition.
If necessary, additives such as a coupling agent, an antifoaming agent, and a surfactant can be used in the resin composition of the present invention.
The resin composition of the present invention can be produced, for example, by premixing the components, kneading using three rolls, and degassing under vacuum.

Adjustment methylimidazole reactants 1 (manufactured by Shikoku Chemicals Corporation, Curezol 2MZ, ^{R 1} is a methyl group in the general formula ^(2), R 2, ^{R 3} is H, hereinafter 2MZ) 82 g isooctyl acrylate ( A reaction was obtained by stirring 202 g of Osaka Organic Chemical Industries, Ltd. (IOAA, hereinafter referred to as IOAA) at 60 ° C. for 2 hours (hereinafter referred to as “Reactant 1”). When H-NMR (in heavy DMSO) of the reaction product was measured, no peak (near 12 ppm) based on active hydrogen at the 1-position of the imidazole ring was observed. The unreacted acryloyl group of isooctyl acrylate was 0.17 with respect to the reaction product 1 of 2-methylimidazole and isooctyl acrylate. That is, the reactant 1 is a mixture of a compound obtained by reacting the compound represented by the general formula (2) with a compound having an acryloyl group and a compound having an acryloyl group.

[Examples 1, 2, 3, 4]
As compound (A), diglycidyl bisphenol A (epoxy equivalent 180, liquid at room temperature, hereinafter referred to as bis A epoxy) obtained by reaction of bisphenol A and epichlorohydrin is used, and 1,2-dimethylimidazole (Shikoku) as compound (B). Made by Kasei Kogyo Co., Ltd., Curazole 1,2-DMZ (hereinafter DMZ), Compound (C) IOAA, Cresyl glycidyl ether (Epoxy equivalent 185, hereinafter CGE), Silane coupling agent having glycidyl group ( Shin-Etsu Chemical Co., Ltd., KBM-403E, hereinafter a coupling agent) was blended as shown in Table 1 and kneaded using three rolls to obtain a resin mixture.
The obtained resin mixture and filler (D) (spherical silica powder having an average particle size of 3 μm and a maximum particle size of 20 μm (hereinafter referred to as silica powder)) were blended in the ratios shown in Table 1 and kneaded using three rolls. The resin composition was obtained by defoaming. The blending ratio is parts by weight.
In Example 4, reactant 1 was used as a mixture of compound (B) and compound (C).
[Comparative Examples 1, 2, 3]
The resin composition was obtained in the same manner as in Example 1 by blending at the ratio shown in Table 1. In Comparative Example 3, 2-methylimidazole (manufactured by Shikoku Chemicals Co., Ltd., Curesol 2MZ, hereinafter 2MZ) was used.
The obtained resin composition was evaluated by the following methods. The evaluation results are shown in Table 1.

Evaluation method / Viscosity: Using an E-type viscometer (3 ° cone), the values at 25 ° C. and 2.5 rpm were measured after preparing the resin composition and after leaving at 25 ° C. for 24 hours. A case where the rate of change in viscosity after standing for 24 hours was 20% or less was regarded as acceptable. The unit of viscosity is Pa · s.
Adhesive strength: A 2 mm × 2 mm silicon chip was mounted on the solder resist surface of a PBGA substrate (BT core) and cured at 100 ° C. for 2 hours. The die shear strength at 150 ° C. was measured using an automatic adhesive force measuring device. The case where the die shear strength at 150 ° C. was 10 N / chip or more was regarded as acceptable. The unit of adhesive strength is N / chip.

The present invention can provide a resin composition that can be cured at a low temperature of 100 ° C. or lower and has high adhesive strength while being a one-component type.

Claims (3)

(A) A resin composition comprising a compound having two or more glycidyl groups in one molecule, (B) a compound represented by the general formula (1), (C) a compound having an acryloyl group, and (D) a filler. R ⁴ in the general formula (1) is a methyl group, and the molar ratio of the acryloyl group of the compound (C) to the compound (B) is from 1: 0.01 to 1: 0.5. Resin composition.

R ¹ : —H or an alkyl group having 20 or less carbon atoms R ² , R ³ : —H, methyl group R ⁴ : organic group The resin composition according to claim ¹ , wherein R ^{1 of the} compound represented by the general formula (1) is a methyl group. (A) A resin composition comprising a compound having two or more glycidyl groups in one molecule, (B) a compound represented by the general formula (1), (C) a compound having an acryloyl group, and (D) a filler. The compound represented by the general formula (1) is a reaction product of the compound represented by the general formula (2) and the compound having an acryloyl group, and the molar ratio of the acryloyl group of the compound (C) to the compound (B) is 1. : A resin composition characterized by being 0.01 to 1: 0.5.

R ¹ : —H or an alkyl group having 20 or less carbon atoms R ² , R ³ : —H, methyl group