Patent ID: 8729177

Claim:
A curable hysteretic silicone gel-forming composition comprising: (A) at least one organopolysiloxane containing at least two silicon-bonded alkenyl groups per molecule; (B) at least one organohydrogenpolysiloxane containing at least two silicon-bonded hydrogen atoms per molecule, said organohydrogenpolysiloxane (B) being used in an amount such that the mole ratio of total amount of silicon-bonded hydrogen atoms contained in organohydrogenpolysiloxane (B) to one silicon-bonded alkenyl group contained in organopolysiloxane (A) is of from about 0.20 to about 0.79; (C) filler in an amount of from about 25 to about 100 parts per hundred of organopolysiloxane (A); (D) catalyst; and, (E) inhibitor; wherein the recovery time of a hysteretic silicone gel obtained from said curable hysteretic silicone gel-forming composition is greater than about 3 seconds, where each organopolysiloxane (A) has the formula: M a M vi b D c D vi d T e T vi f Q g where M=R 7 R 8 R 9 SiO 1/2 ; M vi =R 10 R 11 R 12 SiO 1/2 ; D=R 13 R 14 SiO 2/2 ; D vi =R 15 R 16 SiO 2/2 ; T=R 17 SiO 3/2 ; T vi =R 18 SiO 3/2 ; and Q=SiO 4/2 ; where R 7 , R 8 , R 9 , R 13 , R 14 and R 17 are independently monovalent hydrocarbon radicals having from one to sixty carbon atoms; R 10 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R 11 and R 12 are independently monovalent hydrocarbon radicals having from one to sixty carbon atoms; R 15 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms, and R 16 is a monovalent hydrocarbon radical having from one to sixty carbon atoms; R 17 is a monovalent unsaturated hydrocarbon radical having from two to ten carbon atoms; the stoichiometric subscripts a, b, c, d, e, f, and g are either zero or positive subject to the following limitations: c is greater than 10; d is from zero to about 40; when d=0, b=2; b is from zero to two provided that when b=0, d=2; b+d is of from 2 to about 40; when b=1, a=1; a+b≧2; e+f+g>0, and a+b+c+d≧e+f+g, and wherein said at least one organopolysiloxane (A) comprises a combination of (A-i) vinyl organopolysiloxane having a viscosity of from about 20,000 to about 60,000 centipoise at 25 degrees celsius, and (A-ii) vinyl organopolysiloxane having a viscosity of from about 250 to about 750 centipoise at 25 degrees celsius; organohydrogenpolysiloxane (B) is at least one organohydrogenpolysiloxane having terminal and/or non-terminal silicon-bonded hydrogen atoms and having a viscosity of from about 15 to about 60 centipoise at 25 degrees celsius.