Patent ID: 8247502

Claim:
An addition reaction-curable silicone pressure-sensitive adhesive composition, comprising: (A) a diorganopolysiloxane consisting of: (A1) a linear diorganopolysiloxane having two or more alkenyl groups within each molecule, and (A2) a linear diorganopolysiloxane having SiOH groups at terminals and containing no alkenyl groups, wherein a mass ratio of (A1)/(A2) is within a range from 100/0 to 10/90, in an amount of 20 to 80 parts by mass, (B) an organopolysiloxane comprising R 3 3 SiO 0.5 units, SiO 2 units, and siloxane units having a hydroxyl group bonded to a silicon atom, wherein R 3 represents a monovalent hydrocarbon group of 1 to 10 carbon atoms, a molar ratio of R 3 3 SiO 0.5 units/SiO 2 units is within a range from 0.5 to 0.9, and a hydroxyl group content is within a range from 0.1 to 5.0% by mass, in an amount of 80 to 20 parts by mass (provided that a combined total of component (A) and component (B) is 100 parts by mass), (C) an organohydrogenpolysiloxane comprising three or more SiH groups within each molecule, in an amount such that a molar ratio of SiH groups within component (C) relative to alkenyl groups within the composition is within a range from 0.5 to 20, (D) an addition reaction retarder, in an amount within a range from 0 to 8.0 parts by mass per 100 parts by mass of a combination of component (A) and component (B), (E) a platinum group metal-based catalyst, in an amount sufficient to provide a mass of the platinum group metal equivalent to 1 to 5,000 ppm relative to a combined mass of component (A) and component (B), and (F) an organopolysiloxane comprising R 3 1 SiO 1.5 units and R 3 2 SiO 1 units, wherein R 3 is as defined above, and a molar ratio of R 3 1 SiO 1.5 units/R 3 2 SiO 1 units is within a range from 100/0 to 30/70, in an amount within a range from 1 to 30 parts by mass per 100 parts by mass of a combination of component (A) and component (B).