Patent ID: 11028267

Abstract:
A curable organosilicon resin composition is provided comprising (A) an organopolysiloxane of block polymer structure consisting of 30 to 80 mol % of R1SiO3/2, 10 to 70 mol % of (R1)2SiO2/2 and 0 to 30 mol % of (R1)3SiO1/2 units, having Mw of 5,000-100,000, and containing at least a part of the (R1)2SiO2/2 unit having an average number of 3 to 80 repetitions, at least two silicon-bonded alkenyl groups per molecule, 0.001 to 1.0 mol/100 g of silicon-bonded hydroxyl groups, and up to 1.0 mol/100 g of silicon-bonded alkoxy groups, (B) an organohydrogenpolysiloxane containing at least two SiH groups and at least one silicon-bonded aryl group per molecule, and (C) a hydrosilylation catalyst.