Epoxy resin composition

Claim 1

An epoxy resin composition which comprises 100 parts by weight of an epoxy resin which is dispersed with silicone resin particles comprising a cross-linking reaction product of (a) 5 to 200 parts by weight of at least one of an organopolysiloxane having silanol groups at both ends of the following formula: ##STR28## wherein R 1 is methyl or phenyl, R 2 is phenyl, p is an integer of 9 to 500, and q is 0 or less than 6% of p, with one or more organosilane compounds having at least two alkoxysilyl groups in one molecule which are selected from the group consisting of (b) an aminosilane compound of the formula: ##STR29## wherein R 3 is hydrogen, phenyl, benzyl, cyclohexyl, vinylbenzyl, or allyl, R 4 is --C 2 H 4 --, --C 3 H 6 -- or --C 2 H 4 SC 2 H 4 --, R 5 and R 6 are the same or different and are each methyl or ethyl, R 7 is --C 2 H 4 --, --C 2 H 4 SC 2 H 4 --, --C 2 H 4 NHC 2 H 4 --, or --CO--, R 8 is --C 2 H 4 -- or --C 3 H 6 --, and m is 0 or 1, (c) a mercapto compound of the formula: ##STR30## wherein R 5 , R 6 and m are as defined above, and R 9 is --C 3 H 6 -- or --CH 2 --, (d) an epoxy silane compound of the formula: ##STR31## wherein R 5 , R 6 and m are as defined above, and R 10 is ##STR32## and (e) an isocyanatosilane compound of the formula: ##STR33## wherein R 5 , R 6 and m are as defined above, and R 11 is --A-- or --Q--NHCOX--A-- wherein A is an alkylene having one to 3 carbon atoms, Q is a diisocyanate residue, and X is --NH--, --O-- or --S--, said organopolysiloxane and said organosilane compound being used in a molar ration of the alkoxy groups in the organosilane compound and the hydroxy groups in the organopolysiloxane [OR 6 ]/[OH] of 0.1 to 15.