Patent ID: 8263723

Claim:
An organopolysiloxane represented by the following average structural formula: R 1 a SiO (4-a)/2 {wherein R 1 designates a substituted or unsubstituted monovalent hydrocarbon group, an alkoxy group, a hydroxyl group, or an organopolysiloxane residue of the following general formula: —X—(SiR 2 2 O) m SiR 2 3 (wherein R 2 are the same or different, substituted or unsubstituted monovalent hydrocarbon groups; X represents a bivalent hydrocarbon group; and “m” is an integer equal to or greater than 1); however, at least one R 1 in one molecule is the aforementioned organopolysiloxane residue, at least one R 1 in one molecule is a monovalent hydrocarbon group having an aliphatic carbon-carbon double bond, and “a” is a positive number that satisfies the following condition: 0<a<2)}.