Patent ID: 6506822
Filing Date: 2003-01-14
Classification: C08L,H01L

Abstract:
An epoxy resin composition comprising (A) an epoxy resin, (B) a curing agent, (C) a silicone stress-reducing agent, and (D) a foam-suppressing composition,said foam-suppressing composition (D) comprising (D-i) 5 to 60% by weight of an oil compound consisting of 100 parts by weight of a hydrophobic organopolysiloxane of the following general formula (1): R1aSiO(4-a)/2â€ƒâ€ƒ(1) wherein R1 is at least one group selected from hydroxyl groups and substituted or unsubstituted monovalent hydrocarbon groups of 1 to 18 carbon atoms, and â€œaâ€  is a number of 1.9 to 2.2, having a viscosity of 10 to 500,000 centistokes at 25Â° C., and 0.1 to 20 parts by weight of finely divided silica having a BET specific surface area of at least 100 m2/g,(D-ii) 5 to 95% by weight of a hydrophilic polyoxyalkylene-modified silicone oil of the following general formula (2): R4R22SiOâ€”(R22SiO)xâ€”(R2R3SiO)yâ€”SiR22R4â€ƒâ€ƒ(2) wherein R2 which may be the same or different is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 18 carbon atoms, R3 is a group of the formula: â€”R5O(R6O)b(R7O)câ€”R8 wherein R5 is a divalent C1-C4 hydrocarbon group, R6 is ethylene, R7 is propylene, R8 is hydrogen or a monovalent organic group selected from the class consisting of C1-C6 alkyl, acetyl and isocyanate groups, b is an integer of 3 to 100, c is an integer of 0 to 100, R4 is as defined for R2 or R3, x is an integer of 5 to 100, and y is an integer of 1 to 10, having a cloud point in 1% aqueous solution of at least 40Â° C. and a viscosity of 10 to 100,000 centistokes at 25Â° C., and(D-iii) 0 to 90% by weight of a polyoxyalkylene polymer having a molecular weight of 500 to 5,000, said foam-suppressing composition (D) being present in an amount of 1Ã—10âˆ’4 to 20 parts by weight per 100 parts by weight of components (A) and (B) combined.