Patent ID: 8962498
Filing Date: 2015-02-24
Classification: B60R,C08G,C08L,C09D,D03D,Y10T

Abstract:
1. A liquid curable silicone rubber composition comprising the following components of (A), (B), (C) and (D): (A) 100 parts by weight of an organopolysiloxane having one or more silicon atom-bonded alkenyl groups on average in one molecule; said component (A) comprising component (A-1) and component (A-2), wherein component (A-1) is an organopolysiloxane having at least two alkenyl groups in one molecule, in which the content of the alkenyl group ranges from 0.02 to 1.9% by weight, and has a viscosity of 100 to 1,000,000 mPa·s, and component (A-2) is an organopolysiloxane having at least two alkenyl groups in one molecule, in which the content of the alkenyl group ranges from 8 to 50% by weight, and has a viscosity of less than 50 mPa·s; (B) (B-1) an organohydrogenpolysiloxane having at least three silicon atom-bonded hydrogen atoms in one molecule, wherein at least one of the hydrogen atoms is present as a siloxane unit represented by the formula of R (B-2) a linear organohydrogenpolysiloxane having one silicon atom-bonded hydrogen atom only at each of both terminals of the molecular chain and having no aliphatic unsaturated bond(s) in a molecule, provided that the blending amount of component (B-1) and component (B-2) is an amount such that the molar ratio of silicon atom-bonded hydrogen atoms contained in component (B-1) and component (B-2): alkenyl groups contained in component (A) ranges from (0.8:1.0) to (2.5:1.0), and the total number of silicon atom-bonded hydrogen atoms contained in component (B-2) is 70 to 100% of the total number of silicon atom-bonded hydrogen atoms contained in component (B-1) and component (B-2); provided that when the aforementioned numerical value is 100%, component (B) consists only of (B-2); (C) an amount of a hydrosilylation reaction catalyst necessary to cure the liquid curable silicone rubber composition; and (D) 0.1 to 50 parts by weight of a reinforcing silica fine powder.