Patent ID: 8206831

Claim:
An addition reaction-curable silicone pressure-sensitive adhesive composition, comprising: (A) a polydiorganosiloxane comprising a linear polydiorganosiloxane (A1) and a linear polydiorganosiloxane (A2) having a mass ratio of (A1)/(A2) within a range from 90/10 to 10/90, in an amount of 20 to 80 parts by mass, wherein (A1) the linear polydiorganosiloxane (A1) comprises two or more alkenyl groups within each molecule, and (A2) the linear polydiorganosiloxane (A2) comprises SiOH groups at terminals thereof and no alkenyl groups, and is represented by formula (2): R 2 2 (HO)SiO—(R 2 2 SiO) d —SiR 2 2 (OH) (2), wherein R 2 represents identical or different monovalent hydrocarbon groups of 1 to 10 carbon atoms that contain no aliphatic unsaturated bonds, and d represents an integer that satisfies 500≦d≦20,000; (B) a polyorganosiloxane comprising R 3 3 SiO 0.5 units, SiO 2 units and Si atom-bonded hydroxyl group-containing siloxane units, having a molar ratio of R 3 3 SiO 0.5 units/SiO 2 units within a range from 0.5 to 0.9, wherein R 3 represents a monovalent hydrocarbon group of 1 to 10 carbon atoms, and containing the Si atom-bonded hydroxyl group in an amount of 0.1 to 5.0% by mass, in an amount of 80 to 20 parts by mass, provided that the combined total of the polydiorganosiloxane (A) and the polyorganosiloxane (B) is 100 parts by mass; (C) a polyorganohydrogensiloxane comprising three or more SiH groups within each molecule, in an amount such that a molar ratio of SiH groups within the polyorganohydrogensiloxane (C) relative to alkenyl groups within the polydiorganosiloxane (A) is within a range from 0.5 to 20; (D) a 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 the polydiorganosiloxane (A) and the polyorganosiloxane (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 the polydiorganosiloxane (A) and the polyorganosiloxane (B); and (F) a metal compound represented by a formula MY x , wherein M represents a metal element having an atomic valence of 3 or 4 selected from the group consisting of aluminum, titanium, zirconium and zinc, x represents a number equal to the atomic valence of the metal element M, Y represents at least one ligand selected from the group consisting of RO, RCOO, RCOCHCOR and RCOCHCOOR, and R represents a substituted or unsubstituted monovalent hydrocarbon group of 1 to 10 carbon atoms, in an amount of 0.5 to 8 parts by mass per 100 parts by mass of a combination of the polydiorganosiloxane (A) and the polyorganosiloxane (B), wherein the polyorganosiloxane (B) is condensed with the linear polydiorganosiloxane (A2).