Patent ID: 8877860

Claim:
A two-part curable liquid silicone rubber composition comprising a first liquid composition including components (A), (B), and (C), but not (D) described below and a second liquid composition including components (A), (B), and (D), but not (C) described below, which are stored separately and yield, upon mixing, a silicone rubber forming composition comprising: (A) 100 parts by weight of an alkenyl group-containing organopolysiloxane comprising (A-1) an organopolysiloxane having only silicon-bonded alkenyl groups at each molecular terminal at an amount where the alkenyl groups in component (A-1) is from 70 wt. % to 99.8 wt. % of the alkenyl groups in component (A), and (A-2) an organopolysiloxane having on average from 1 to 4 silicon-bonded alkenyl groups in side molecular chains and containing not greater than 2.0 wt. % of alkenyl groups at an amount where the alkenyl groups in component (A-2) is from 0.2 wt. % to 30 wt. % of the alkenyl groups in component (A); (B) from 1 to 200 parts by weight of a calcium carbonate powder; (C) a hydrosilylation reaction catalyst at an amount required for curing the composition; and (D) an organohydrogenpolysiloxane having at least two silicon-bonded hydrogen atoms in one molecule at an amount where a molar ratio of the silicon-bonded hydrogen atoms in this component to the silicon-bonded alkenyl groups in component (A) is from 0.015 to 30.0.