Patent ID: 7396867

Claim:
A self-adhesive organopolysiloxane composition for bonding to magnesium alloys comprising (A) 100 parts by weight of an organopolysiloxane of the following general formula (1) or (2) or a mixture thereof, HO(SiR 2 O) n H (1) wherein R may be the same or different and represents a halogen-substituted or unsubstituted alkyl, cycloalkyl or aryl group having 1 to 10 carbon atoms, and the letter n is an integer of at least 10, wherein R and n have the same meanings as above, X represents an oxygen atom or an alkylene group having 2 to 5 carbon atoms, and the letter m independently represents an integer of 0 or 1; (B) 0.1 to 50 parts by weight of an organosilicon compound having at least three hydrolyzable groups bonded to silicon atoms in a molecule and/or a partial hydrolyzate thereof; and (C) 0.1 to 15 parts by weight of an acidic silane coupling agent selected from the group consisting of an acid anhydride-functional silane coupling agent, a carboxylic acid-functional silane coupling agent, a sulfonic acid-functional silane coupling agent, a phosphoric acid-functional silane coupling agent, a phenol-functional silane coupling agent, and a fluoroalcohol-functional silane coupling agent.