Patent ID: 8691910

Claim:
A curable silicone composition capable of producing a flex-resistant, highly transparent cured silicone product having JIS K6253 type-A durometer hardness in the range of 77 to 95 and JIS K6251 elongation equal to or greater than 38%, the aforementioned curable silicone composition comprising: 100 parts by mass of an alkenyl-containing organopolysiloxane (A) comprising: a dialkylpolysiloxane (A-1) that constitutes 52 to 69 mass % of component (A), contains on average at least 2 alkenyl groups in one molecule and has a 25° C. viscosity in the range of 5,000 to 35,000 mPa·s; and a alkenyl-containing organopolysiloxane resin (A-2) that constitutes 31 to 48 mass % of component (A), consists essentially of SiO 4/2 units, R 1 2 R 2 SiO 1/2 units, and R 1 3 SiO 1/2 units (where R 1 designates alkyl groups with 1 to 10 carbon atoms, and R 2 designates alkenyl groups), has the content of alkenyl groups ranging from 3.5 to 5.0 mass %, and the ratio of the sum of the mole numbers of the R 1 2 R 2 SiO 1/2 units and R 1 3 SiO 1/2 units to 1 mole of the SiO 4/2 units ranges from 0.5 to 1.4; an organopolysiloxane (B) wherein silicon-bonded hydrogen atoms are in an amount of at least 0.7 mass % and wherein silicon-bonded groups other than hydrogen atoms are alkyl groups having 1 to 10 carbon atoms, with component (B) containing silicon-bonded hydrogen atoms in the amount of 0.7 to 5 moles per 1 mole of the total amount of alkenyl groups of component (A); and a catalytic quantity of a hydrosilylation catalyst (C).