Organosilicon compound and thermosetting resin composition containing the same

An organosilicon compound which is obtained by subjecting a compound (A), a compound (B) and a compound (C) to hydrosilylation reaction:

• (A) silicone and/or silsesquioxane that has two or more Si—H groups per one molecule and has a molecular weight of 100 to 500,000, wherein the compound (A) is a silsesquioxane derivative represented by the formula (a-4-1):
• (B) silicone and/or silsesquioxane that has two or more alkenyl groups per one molecule and has a molecular weight of 100 to 500,000, wherein the compound (B) is at least one compound selected from the group consisting of compounds represented by the formulae (b-1) and (b-2);
• and
• (C) a compound that has one or more epoxy or oxetanyl group and an alkenyl group having 2 to 18 carbon atoms per one molecule, wherein the compound (C) is at least one compound selected from the group consisting of compounds represented by the formulae (c-1), (c-2) and (c-3):
• wherein
• in the formulae (b-1) and (b-2),
• R represents a group selected independently from alkyl having 1 to 45 carbon atoms, cycloalkyl having 4 to 8 carbon atoms, aryl having 6 to 14 carbon atoms and arylalkyl having 7 to 24 carbon atoms, wherein
• in the alkyl having 1 to 45 carbon atoms, arbitrary hydrogen may be replaced by fluorine, and arbitrary —CH2— may be replaced by —O— or —CH═CH—, provided that two —CH2— adjacent to each other are not simultaneously replaced;
• in the benzene ring in the aryl and the arylalkyl, arbitrary hydrogen may be replaced by halogen or alkyl having 1 to 10 carbon atoms, and in the alkyl having from 1 to 10 carbon atoms, arbitrary hydrogen may be replaced by fluorine, and arbitrary —CH2— may be replaced by —O— or —CH═CH—, provided that two —CH2— adjacent to each other are not simultaneously replaced;
• and
• the alkylene in the arylalkyl has 1 to 10 carbon atoms, in which in the alkylene, arbitrary —CH2— may be replaced by —O—, provided that two —CH2— adjacent to each other are not simultaneously replaced,
• R1 represents a group selected independently from alkyl having 1 to 4 carbon atoms, cyclopentyl, cyclohexyl and phenyl,
• R4 represents a group selected independently from alkyl having 1 to 4 carbon atoms, cyclopentyl, cyclohexyl and phenyl,
• Y represents a group selected independently from vinyl and allyl, and
• n represents an integer of 0 to 100, and
• wherein
• in the formulae (c-1), (c-2) and (c-3),
• one of R5 and R6 represents alkenyl having 2 to 10 carbon atoms in which one —CH2— may be replaced by —O— or 1,4-phenylene, and the other of R5 and R6 represents hydrogen or alkyl having 1 to 6 carbon atoms.