Silicone rubber sponge composition, sponge, and process for making
AssigneeDow Corning Toray Silicone Co., Ltd.
InventorsKatsuya Baba, Manabu Suto, Akito Nakamura
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Abstract
A silicone rubber sponge composition, a silicone rubber sponge, and a process for production thereof. The silicone rubber sponge composition comprises (A) 100 parts by weight organopolysiloxane gum described by average structural unit RaSiO(4−a)/2, where R is a monovalent hydrocarbon group or haloalkyl and a is 1.8 to 2.3 and having a viscosity at 25° C. of 1,000,000 mPa·s or above, (B) 1 to 400 parts by weight inorganic filler, (C) 0.01 to 50 parts by weight hollow thermoplastic resin particles, (D) 0.01 to 10 parts by weight a water-in-oil emulsion with silicone oil an oil phase, and (E) a curing agent in an amount sufficient to cure the composition.
Claims15
A silicone rubber sponge composition comprising
- (A) 100 parts by weight organopolysiloxane gum described by average structural unit RaSiO(4−a)/2, where R is a monovalent hydrocarbon group or haloalkyl and a is 1.8 to 2.3 and having a viscosity at 25° C. of 1,000,000 mPa·s or above,
- (B) 1 to 400 parts by weight inorganic filler,
- (C) 0.01 to 50 parts by weight hollow thermoplastic resin particles,
- (D) 0.01 to 10 parts by weight water-in-oil emulsion with silicone oil as an oil phase, and
- (E) a curing agent in an amount sufficient to cure the composition.
A silicone rubber sponge article comprising the reaction product of a composition comprising
- (A) 100 parts by weight organopolysiloxane gum described by average structural unit RaSiO(4−a)/2, where R is a monovalent hydrocarbon group or haloalkyl and a is 1.8 to 2.3 and having a viscosity at 25° C. of 1,000,000 mPa·s or above,
- (B) 1 to 400 parts by weight inorganic filler,
- (C) 0.01 to 50 parts by weight hollow thermoplastic resin particles,
- (D) 0.01 to 10 parts by weight water-in-oil emulsion with silicone oil as an oil phase, and
- (E) a curing agent in an amount sufficient to cure the composition.
A process for making a silicone rubber sponge article comprising curing a composition comprising
- (A) 100 parts by weight organopolysiloxane gum described by average structural unit RaSiO(4−a)/2, where R is a monovalent hydrocarbon group or haloalkyl and a is 1.8 to 2.3 and having a viscosity at 25° C. of 1,000,000 mPa·s or above,
- (B) 1 to 400 parts by weight inorganic filler,
- (C) 0.01 to 50 parts by weight hollow thermoplastic resin particles,
- (D) 0.01 to 10 parts by weight water-in-oil emulsion with silicone oil as an oil phase, and
- (E) a curing agent in an amount sufficient to cure the composition, by heating at a temperature equal to or above the softening point of component (C).
Dependencies are inferred from the claim text.