Patent ID: 7312296
Filing Date: 2007-12-25
Classification: C08K,C08L,C09J

Abstract:
1. A silicone adhesive exhibiting pressure-sensitive adhesion and permanent adhesion, comprising (A) 100 parts by weight of an organopolysiloxane partial condensate obtained by partial condensation of (i) a diorganopolysiloxane having a hydroxyl radical at an end of its molecular chain, represented by the following general formula (1): wherein R 1 and R 2 each are a substituted or unsubstituted monovalent hydrocarbon radical, wherein the diorganopolysiloxane further contains alkenyl radicals in amount of 0.02 to 0.5 mol % based on the total of R 1 and R 2 , and m is an integer of 500 to 10,000, with (ii) an organopolysiloxane copolymer having hydroxyl radicals in a molecule and consisting essentially of R 3 3 SiO 1/2 units and SiO 4/2 units in a molar ratio of R 3 3 SiO 1/2 units to SiO 4/2 units of from 0.5 to 1.5, wherein R 3 is a hydroxyl radical or a substituted or unsubstituted monovalent hydrocarbon radical, (B) 0.1 to 20 parts by weight of: (C) a crosslinking agent comprising (a) an organohydrogenpolysiloxane having at least two silicon atom-bonded hydrogen atoms in a molecule, in an amount to give 0.2 to 30 mol of silicon atom-bonded hydrogen atoms per mol of alkenyl radicals in components (A) and (B), and (b) a catalytic amount of a platinum base catalyst.