| 摘要 |
<p>Provided is a curable polyorganosiloxane composition which provides a cured product that has excellent cold resistance. The present invention relates to a curable polyorganosiloxane composition which contains: (A) an alkenyl group-containing polyorganosiloxane that is composed of (A1) a linear polyorganosiloxane represented by formula (I) (wherein R moieties independently represent R1 or R2 moiety, at least two R moieties are R1 moieties, the R1 moieties independently represent a C2-C6 alkenyl group, the R2 moieties independently represent a C1-C6 alkyl group, and n represents a number that makes the viscosity at 23°C to be 10-10,000 cP) and (A2) a branched polyorganosiloxane which is composed of an SiO4/2 unit and an R'3SiO1/2 unit, and if necessary, an R'2SiO unit and/or an R'SiO3/2 unit (wherein R' moieties independently represent an unsubstituted or substituted monovalent aliphatic group or alicyclic group) and wherein at least three R' moieties are alkenyl groups in each molecule, with the weight ratio of the component (A2) to the component (A1) being 1-5 and the weight ratio of the SiO4/2 unit and the R'SiO3/2 unit, which is optionally present, in the total amount of the components (A1) and (A2) being 20-60% by weight; (B) a polyorganohydrogen siloxane that has more than two hydrogen atoms, each of which is bonded with a silicon atom, in each molecule; and (C) a platinum group metal compound.</p> |
