Patent ID: 6245875
Filing Date: 2001-06-12
Classification: C08G,C08L

Abstract:
A curable composition compising:(a) 50 to 90 parts by weight of an alkenyl terminated linear diorganopolysiloxane gum having a viscosity in the range of 1,000,000 to 200,000,000 centipoise at 25.degree. C. and having an akenyl concentration of about 0.01 to 0.05 mole percent of siloxy units;(b) 10 to 30 parts by weight of an alkvl terminated diorganopolysiloxane gum having a viscosity in the range of 1,000,000 to 200,000,000 centipoise at 25.degree. C.;(c) 3 to 20 parts by weight of an alkenyl containing diorganopolysiloxane gum having a viscosity varying from 100,000 to 200,000,000 centipoise at 25.degree. C. and having an alkenyl concentration of about 0.5 to 15 mole percent of siloxy units;(d) 40 to 60 parts by weight of treated fumed silica with surface area varying from about 130 to 350 m.sup.2 /g;(e) 0.5 to 3.0 parts by weight of a hydroxy terminated polysiloxane fluid having about 0.5 mole percent alkenyl; and(f) from about 0.5 to about 5 parts by weight trimethylolpropane trimethacrylate.