Silicone rubber sponge composition and producing method thereof

Abstract

A silicone rubber sponge composition, including: (A) 100 parts by mass of an addition-crosslinkable silicone rubber composition containing a reinforcing silica and being liquid at 25° C.; (B) 1.0 to 20 parts by mass of expanded resin fine particles having a specific gravity of 0.01 to 0.3, having an average particle diameter of 10 to 200 μm, and having an organic resin shell; and (C) 0.1 to 10 parts by mass of spherical particles having average particle diameter being 0.001 to 0.5 times larger than average particle diameter of the component (B) expanded resin fine particles, and having an average circularity of 0.8 to 1. This improves flowability of silicone rubber sponge composition containing the expanded resin fine particles, reduces contractive deformation due to pressure of the expanded resin fine particles during casting or injection-molding. Thus, provided are a silicone rubber sponge composition that can reduce density of a sponge rubber.

Dependencies are inferred from the claim text.