Patent ID: 8372936

Claim:
A silicone-type pressure-sensitive adhesive composition comprising the following components (A), (B), (C), and (D): (A) 100 weight parts of organopolysiloxane condensation reaction product that has at least two C 2-10 alkenyl groups in the molecule and that is yielded by a condensation reaction between the following components (a) and (b) in the presence of component (c) (a) 20 to 80 weight parts of diorganopolysiloxane that has at least one hydroxyl group in molecular chain terminal position and that is represented by the following average structural formula (1) where in the above formula: each R′ independently designates a group selected from a C 1-20 alkyl group, a C 6-20 aryl group, and a C 7-20 aralkyl group; R″ is a C 2-10 alkenyl group; (m1+m2) is equal to a value of from 2000 to 10000; m2 is a positive number; and where 0<m2/(m1+m2) 0.05, (b) 80 to 20 weight parts of organopolysiloxane resin substantially comprising the XR 2 2 SiO 1/2 unit (in the formula, X is a hydrolyzable group selected from the hydroxyl group or C 2-6 alkoxy groups and the R 2 groups independently designate C 1-10 unsubstituted or substituted monovalent hydrocarbyl groups), R 2 3 SiO 1/2 unit (the R 2 groups are as previously defined), and SiO 4/2 unit, wherein the organopolysiloxane resin of component (b) contains from 0.5 to 10 wt. % hydroxyl groups, and (wherein the sum of component (a) and component (b) is 100 weight parts and at least two among all of the R″ and R 2 groups are C 2-10 alkenyl groups) (c) a catalyst that promotes the condensation reaction, in a catalytic quantity; (B) an organohydrogenpolysiloxane that contains at least two silicon-bonded hydrogen atoms in the molecule, in an amount sufficient to provide from 1 to 200 silicon-bonded hydrogen atoms per alkenyl group based on the total number of silicon-bonded alkenyl groups present in the silicone-type pressure-sensitive adhesive composition; (C) an organotitanium compound, at from 0.1 to 20 weight parts; and (D) a platinum catalyst in a catalytic quantity.