Patent ID: 7470804

Claim:
An organopolysiloxane composition for magnesium alloy bonding comprising (A) 100 parts by weight of at least one organopolysiloxane selected from the group consisting of an organopolysiloxane having the general formula (1): HO(SiR 2 O) n H (1) wherein R is each independently a substituted or unsubstituted monovalent hydrocarbon radical of 1 to 10 carbon atoms, and n is an integer of at least 10, an organopolysiloxane having the general formula (2): wherein R and n are as defined above, Me is methyl, X is an oxygen atom or an alkylene radical of 2 to 5 carbon atoms, m is independently 0 or 1, and an organopolysiloxane having the general formula (3): wherein R, Me, X and m are as defined above, p is an integer of at least 10, q is an integer of 1 to 5, and R 1 is a branching chain containing a hydrolyzable radical of the formula (4): wherein R, Me, X and m are as defined above, (B) 0.1 to 50 parts by weight of an organosilicon compound having at least three hydrolyzable radicals each bonded to a silicon atom in the molecule and/or a partial hydrolyzate thereof, and (C) 0.1 to 15 parts by weight of an acid anhydride excluding acid anhydride functional silane coupling agents.