Curable liquid silicone rubber composition

Abstract

Abstract PURPOSE:To provide the titled low-viscosity rubber composition of low thermal expansion coefficient, comprising an unsaturated group-contg. organo polysiloxane, organohydrogenpolysiloxane, silica powder, platinum (compound) and specific organosilicon compound. CONSTITUTION:The objective silicone rubber composition comprising (A) 100pts. wt. of an organopolysiloxane with viscosity (at 25 deg.C) of 50-10,000cs, having in one molecular at least one aliphatic unsaturated group (e.g. vinyl group), of average formula [R is 1-8C (substituted)monovalent hydrocarbon group; (a) is 1.9-2.07], (B) 0.1-50pts.wt. of an organohydrogenpolysiloxane having in one molecule two or more H atom bonded to Si atom, (C) 100-1,000pts.wt. of silica powder with average pariticle size <=60mum, made up of 30-100pts.wt. of fused silica and 70-0wt.% of crystalline silica, (D) platinum (compound) in such quantities as to be sufficient for catalyst, and (E) 0.5-30pts.wt. of an organosilicone compound with molecular weight <=2,300 having in one molecule at least one hydrosilylated functional group and/or SiOH group.

Inventors

• 👤 Hiroshi Inomata
• 👤 Masachika Yoshino

Bibliographic Details