| 摘要 |
PROBLEM TO BE SOLVED: To provide a curable silicone rubber composition that affords a silicone rubber exhibiting high hardness and excellent tensile strengths and elongation and includes excellent workability before curing. SOLUTION: The curable silicone rubber composition includes as essential ingredients (A) 100 pts.wt. of a polyorganosiloxane having a polymerization degree of at least 3,000 and containing 0.001-1 wt.% of a vinyl group, (B) 0.5-10 pts.wt. of a polyorganosiloxane copolymer constituted of an R<SB>3</SB>SiO<SB>1/2</SB>unit (wherein, R is a vinyl group or a monovalent hydrocarbon group having no aliphatic unsaturated moiety) and an SiO<SB>2</SB>unit (wherein, R is a vinyl group or a monovalent hydrocarbon group having no aliphatic unsaturated moiety) with a ratio of the R<SB>3</SB>SiO<SB>1/2</SB>unit to the SiO<SB>2</SB>unit within the range of 0.1-2.0 and bearing 0.5-8 wt.% of a vinyl group, (C) 10-100 pts.wt. of surface-treated fine powder silica obtained by treating the surface of fine powder silica (c-1) having a specific surface area of at least 50 m<SP>2</SP>/g with a specific surface-treating agent (c-2) and, (D) a necessary amount of a curing agent. COPYRIGHT: (C)2010,JPO&INPIT |
