Patent ID: 8168739

Claim:
A polysiloxane obtained by conducting a hydrolysis and polycondensation reaction of a silicon compound (T) having three hydrolyzable groups, a silicon compound (D) having two hydrolyzable groups, and a silicon compound (M) having one hydrolyzable group, wherein at least one compound of said silicon compound (T), said silicon compound (D), and said silicon compound (M) has a hydrosilyl group, wherein at least one compound of said silicon compound (T), said silicon compound (D), and said silicon compound (M) has a hydrosilylatable carbon-carbon unsaturated group, wherein said polysiloxane has a hydrosilylatable carbon-carbon unsaturated group, a hydrosilyl group and an alkoxysilyl group, and has a number average molecular weight of 500 to 20,000, wherein said polysiloxane comprises a unit represented by formula (I): wherein A is an organic group having 2 to 10 carbon atoms containing a hydrosilylatable carbon-carbon unsaturated group, R 1 is an alkylene group having 1 to 20 carbon atoms, a divalent aromatic group having 6 to 20 carbon atoms or a divalent alicyclic group having 3 to 20 carbon atoms, n is 0 or 1, R 2 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an organic group having 2 to 10 carbon atoms containing a hydrosilylatable carbon-carbon unsaturated group (each R 2 in one molecule may be the same or different), R 3 is a hydrogen atom or an organic group having 2 to 10 carbon atoms containing a hydrosilylatable carbon-carbon unsaturated group, R 4 is a hydrogen atom, an alkyl group having 1 to 10 carbon atoms or an organic group having 2 to 10 carbon atoms containing a hydrosilylatable carbon-carbon unsaturated group (each R 4 in one molecule may be the same or different), R 5 is an alkyl group having 1 to 6 carbon atoms, v is 5-100, w is 0-40, x is 0.1-40, y is 0.1-50 and z is 0.1-20, and wherein 0.001≦x/(v+w)≦2, 0.01≦y/(v+w)≦2, and 0.01≦z/(v+w+x+y)≦1, whereby, when w is zero, at least one of R 2 , R 3 and R 4 is an organic group having 2 to 10 carbon atoms containing a hydrosilylatable carbon-carbon unsaturated group.