| 摘要 |
PROBLEM TO BE SOLVED: To provide a silicone rubber sponge composition reduced in the toxicity of decomposed products in its expansion, high in expansibility even with no consideration of the crosslinking rate control of the composition and the delicate balance between a foaming agent and an organic peroxide, and giving a silicone rubber sponge having uniform and fine cellular structure and smooth skin layer, especially a silicone rubber sponge of low hardness and high expansion ratio. SOLUTION: The silicone rubber sponge composition comprises (A) 100 pts.mass of an organopolysiloxane of the average compositional formula(1):R<SB>a</SB>SiO<SB>4-a/2</SB>(Rs are the same as or different from each other and each a nonsubstituted or substituted monovalent hydrocarbon group; and (a) is a positive number of 1.95-2.04), (B) 0.1-20 pts.mass of an organic foaming agent capable of thickening or curing the component(A) by thermal decomposition, (C) 0.5-20 pts.mass of sodium bicarbonate and (D) such an amount of a curing agent as to enable the component(A) to be cured. COPYRIGHT: (C)2006,JPO&NCIPI |
