Patent ID: 6369155
Filing Date: 2002-04-09
Classification: C08L,Y10S

Abstract:
A fluorosilicone rubber composition comprising(1) 100 parts by weight an organopolysiloxane of the following formula (1): R1aR2bR3cSiO(4âˆ’aâˆ’bâˆ’c)/2â€ƒâ€ƒ(1) â€ƒwherein R1 is trifluoropropyl, R2 is a substituted or unsubstituted monovalent aliphatic unsaturated hydrocarbon group of 2 to 8 carbon atoms, R3 is an unsubstituted, aliphatic unsaturation-free, monovalent hydrocarbon group of 1 to 8 carbon atoms, a is a number of 0.98 to 1.01, b is a number of 0.0001 to 0.01, c is a number of 0.98 to 1.01, and a+b+c is 1.98 to 2.02, wherein said organopolysiloxane has a viscosity of at least 10,000 centistokes at 25Â° C., (2) 5 to 100 parts by weight a microparticulate silica filler, (3) 0.5 to 20 parts by weight an organopolysiloxane of the following formula (2): â€ƒwherein R4 to R6 are independently substituted or unsubstituted, aliphatic unsaturation-free, monovalent hydrocarbon groups of 1 to 8 carbon atoms, p is a number of 0 to 50, q is a number of 4 to 100, p+q is from 4 to 100, and q/(p+q) is at least 0.7, and (4) an effective amount of a curing agent.