Patent ID: 7829648

Claim:
A silicone gel composition, comprising: (A) 100 parts by mass of an organopolysiloxane containing at least one alkenyl group bonded to a silicon atom within each molecule, represented by an average composition formula (1a): wherein, each R 2 group represents, independently, an unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, each R 3 group represents, independently, either an unsubstituted or substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, or an alkenyl group, and one of the terminal R 3 groups at both molecular chain terminals is an alkenyl group, k represents an integer of 40 to 1,200, m represents an integer of 0 to 50, and n represents an integer of 0 to 50; (B) an organohydrogenpolysiloxane containing at least two hydrogen atoms bonded to silicon atoms and unsubstituted or halogen-substituted monovalent hydrocarbon groups not containing aliphatic unsaturated bonds as substituents bonded to silicon atoms within each molecule; wherein said organohydrogenpolysiloxane consists of organohydrogenpolysiloxanes comprising from 100 to 1,000 silicon atoms within each molecule, containing at least two hydrogen atoms bonded to silicon atoms at the non-terminal positions and represented by an average unit formula (2): R 4 c H d SiO (4-c-d)/2 (2) wherein, each R 4 group represents, independently, an unsubstituted or halogen-substituted monovalent hydrocarbon group that contains no aliphatic unsaturated bonds, c represents a positive number ranging from 1.0 to 2.2, d represents a positive number ranging from 0.002 to 0.025, and c+d represents a number within a range from 1.001 to 2.225, in a quantity of at least 15 parts by mass, and in sufficient quantity to provide from 0.3 to 2.5 hydrogen atoms bonded to silicon atoms for every one alkenyl group bonded to a silicon atom within said component (A); and (C) an effective quantity of a platinum-based catalyst.