Patent ID: 8063143

Claim:
An adhesion promoter that comprises a radical copolymer obtained by copolymerizing (a) a vinyl monomer that does not have in its molecule an epoxy group, an alkoxysilyl group, and a hydrosilyl group, (b1) a vinyl monomer having in its molecule an epoxy group and not having an alkoxysilyl group and a hydrosilyl group, (b2) a vinyl monomer having in its molecule an alkoxysilyl group, but not having an epoxy group and hydrosilyl group, and (c) a vinyl monomer having in its molecule a hydrosilyl group and represented by the following formula: XSi [OSiH (R 3 ) 2 ] g [OSi (R 3 ) 3 ] h (R 4 ) i wherein X is a radical-polymerizable vinyl-bond-containing group, R 3 is an aryl group or alkyl group with 1 to 10 carbon atoms, R 4 is an alkoxy group, an aryl group, or an alkyl group with 1 to 10 carbon atoms, “g” is an integer within the range of 1 to 3, “h” and “i” are integers within the range of 2 to 0, and g+h+i=3, said radical copolymer being copolymerized in the presence of (d) a chain-transfer agent comprising a mercapto-containing organic silicon compound or an organic mercaptan.