Silicone-Based Pressure-Sensitive Adhesive Composition and Adhesive Tape

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 R1 designates a non-substituted or substituted monovalent saturated hydrocarbon group, R2 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;
• constituent (b) is used in the amount of 1 to 30 parts by weight and comprises an organopolysiloxane resin having one or more hydrolyzable groups in one molecule and consisting essentially of XR32SiO1/2 units, where X stands for an OH group and a hydrolyzable group selected from alkoxy groups having 2 to 6 carbon atoms, and R3 may independently designate non-substituted or substituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, R33SiO1/2 units wherein R3 are the same as defined above, and SiO4/2 units;
• constituent (c) is a condensation catalyst used in a catalytic quantity;
• (B) is an organohydrogenpolysiloxane represented by the general formula (2):
• wherein R1 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 R1 designates a non-substituted or substituted saturated monovalent hydrocarbon group, R2 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 R43SiO1/2 units where R4 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 R4 are non-substituted or substituted monovalent hydrocarbon groups having 1 to 10 carbon atoms, and SiO4/2 units;
• and
• (E) is a platinum catalyst.