| 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 organopolysiloxane which contains at least two alkenyl groups bonded to a silicon atom at an end of a molecular chain in one molecule and no alkenyl group along the molecular chain, and which has a specific viscosity; (B) a resin-quality copolymer which contains a RSiOunit and a SiOunit in specific ratios and contains a specific amount of vinyl groups; (C) an organohydrogenpolysiloxane having at least two SiH groups in one molecule; (D) fumed silica; (E) at least one silica surface treatment agent selected from a silane and a silazane compound containing an alkenyl group; and (F) an addition reaction catalyst. 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. |
