Patent ID: 8178207

Claim:
A silicone-based pressure-sensitive adhesive composition comprising components (A) through (E), wherein: (A) is a condensation-reaction product obtained by subjecting constituents (a) and (b) given below to a condensation reaction in the presence of constituent (c), wherein: constituent (a) is used in the amount of 10 parts by weight and comprises a diorganopolysiloxane having silanol groups on both molecular terminals and 2 or more silicon-bonded alkenyl groups located in side molecular chains on average in one molecule, represented by general formula (1): where R 1 designates a non-substituted or substituted monovalent saturated hydrocarbon group, R 2 designates an alkenyl group having 2 to 10 carbon atoms, “m” is an integer equal to or greater than 2000, and “n” is an integer equal to or greater than 2; constituent (b) is used in the amount of 1 to 30 parts by weight and comprises an organopolysiloxanc resin having one or more hydrolyzable groups in one molecule and consisting essentially of XR 3 2 SiO 1/2 units, where X stands for an OH group and a hydrolyzable group selected from alkoxy groups having 2 to 6 carbon atoms, and R 3 may independently designate non-substituted or substituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, R 3 3 SiO 1/2 units wherein R 3 are the same as defined above, and SiO 4/2 units; constituent (c) is a condensation catalyst used in a catalytic quantity; (B) is an organohydrogenpolysiloxane represented by the general formula (2): wherein R 1 designates a non-substituted or substituted saturated monovalent hydrocarbon group, “p” is a positive integer, “q” is an integer equal to or greater than 2, and where “p” and “q” satisfy the following condition: 10≦(p+q)≦200; (C) is a diorganopolysiloxane having silicon-bonded alkenyl groups on both molecular terminals, represented by the general formula (3): wherein R 1 designates a non-substituted or substituted saturated monovalent hydrocarbon group, R 2 designates an alkenyl group with 2 to 10 carbon atoms, “r” designates an integer equal to or greater than 2000, and “s” designates 0 or a positive integer; (D) is an organopolysiloxane resin consisting essentially of R 4 3 SiO 1/2 units, where R 4 designates a group selected from a non-substituted or substituted monovalent hydrocarbon group, an OH group, or an alkoxy group having 2 to 6 carbon atoms, and where 90% or more of groups designated by R 4 are non-substituted or substituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, and SiO 4/2 units; and (E) is a platinum catalyst.