Patent ID: 7851563

Claim:
A silicone gel composition comprising: (A) an organopolysiloxane represented by formula (1): R a R 1 b SiO (4-a-b)/2 (1), wherein R represents an alkenyl group, R 1 represents a substituted or unsubstituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, a represents a number from 0.0001 to 0.2 and b represents a number from 1.7 to 2.2, provided that a+b is a number within a range from 1.9 to 2.4, and wherein said organopolysiloxane (A) comprises at least one alkenyl group bonded to a silicon atom at the molecular chain terminals and/or at non-terminal positions within the molecular chain, (B) a component comprising: (B-1) an organohydrogenpolysiloxane represented by formula (2): (HR 2 2 SiO 1/2 ) c (R 3 2 SiO) d (R 4 SiO 3/2 ) e (2), wherein R 2 , R 3 and R 4 represent identical or different substituted or unsubstituted monovalent hydrocarbon groups that contain no aliphatic unsaturated bonds, c represents a number from 0.005 to 0.3, d represents a number from 0.5 to 0.98, and e represents a number from 0.01 to 0.12, provided that c+d+e=1, and wherein said organohdrogenpolysiloxane (B-1) comprises at least three hydrogen atoms bonded to silicon atoms at the molecular chain terminals, and wherein said organohydrogenpolysiloxane (B-1) comprises at least two branching points represented by R 4 SiO 3/2 , and (B-2) an organohydrogenpolysiloxane represented by formula (3): R 5 f H g SiO (4-f-g)/2 (3), wherein R 5 represents a substituted or unsubstituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, f represents a number from 0.7 to 2.2 and g represents a number from 0.001 to 0.5, provided that f+g is a number within a range from 0.8 to 2.5, and wherein said organohdrogenpolysiloxane (B-2) comprises one or two hydrogen atoms bonded to silicon atoms within the molecular chain, and at least one of said hydrogen atoms bonded to silicon atoms is at a molecular chain terminal, wherein a number α of hydrogen atoms bonded to silicon atoms derived from component (B-1) and a number β of hydrogen atoms bonded to silicon atoms derived from component (B-2) satisfy a formula (4): 0<β/(α+β)≦0.75 (4), and a combined total of hydrogen atoms bonded to silicon atoms within component (B) per alkenyl group bonded to a silicon atom within component (A) is within a range from 0.1 to 5, and (C) an effective quantity of a platinum-based catalyst.