Patent ID: 8092910

Claim:
A method of preparing a reinforced silicone resin film, the method comprising the steps of: impregnating a fiber reinforcement in a hydrosilylation-curable silicone composition comprising a silicone resin; and heating the impregnated fiber reinforcement at a temperature sufficient to cure the silicone resin; wherein the reinforced silicone resin film comprises from 10 to 99% (w/w) of the cured silicone resin and the film has a thickness of from 15 to 500 μm, wherein the hydrosilylation-curable silicone composition comprises (A) a silicone resin having the formula (R 1 R 2 2 SiO 1/2 ) w (R 2 2 SiO 2/2 ) x (R 1 SiO 3/2 ) y (SiO 4/2 ) z (I) provided the silicone resin has an average of at least two silicon-bonded alkenyl groups per molecule, wherein R 1 is C 1 to C 10 hydrocarbyl or C 1 to C 10 halogen-substituted hydrocarbyl, both free of aliphatic unsaturation, R 2 is R 1 or alkenyl, w is from 0 to 0.8, x is from 0 to 0.6, y is from 0 to 0.99, z is from 0 to 0.35, w+x+y+z=1, y+z/(w+x+y+z) is from 0.2 to 0.99, and w+x/(w+x+y+z) is from 0.01 to 0.8, wherein the hydrosilylation-curable silicone composition further comprises (B) an organosilicon compound having an average of at least two silicon-bonded hydrogen atoms per molecule in an amount sufficient to cure the silicone resin (A); and (C) a catalytic amount of a first hydrosilylation catalyst, wherein the organosilicon compound of component (B) is an organohydrogenpolysiloxane resin having the formula (R 1 R 4 2 SiO 1/2 ) w (R 4 2 SiO 2/2 ) x (R 1 SiO 3/2 ) y (SiO 4/2 ) z (II), wherein R 4 is R 1 or an organosilylalkyl group having at least one silicon-bonded hydrogen atom, provided at least 50 mol% of the groups R 4 are organosilylalkyl.