| 摘要 |
PROBLEM TO BE SOLVED: To provide an addition-curable silicone rubber composition that gives a cured product having high hardness, high extensibility, high tensile strength and high tear strength.SOLUTION: The addition-curable silicone rubber composition comprises the following components in each predetermined amount: (A) an alkenyl group-containing straight-chain organopolysiloxane which contains an alkenyl group bonded to a silicon atom at both ends of the molecular chain and no alkenyl group along the molecular chain, which has an average polymerization degree of 2,000 or less, and which is liquid at room temperature; (B) an organohydrogenpolysiloxane having two SiH groups in one molecule; (C) an organohydrogenpolysiloxane having three or more SiH groups in one molecule; (D) fumed silica; and (F) an addition reaction catalyst. A molar ratio of SiH groups in the (B) component to alkenyl groups in the (A) component is 0.01 to 2.0. The addition-curable silicone rubber composition gives a silicone rubber cured product having a hardness scale of 75 or more measured with a durometer type A and an elongation at break of 300% or more. |
