Foamable silicone composition, silicone sponge, and silicone spo

Details Foamable silicone composition, silicone sponge, and silicone spo Foamable silicone composition, silicone sponge, and silicone spo

1991-04-26

1992-06-09

Foelak, Morton

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156294, 521 79, 521 91, 521 95, 521 96, 521154, B29C 4700, C08J 910

Patent

active

051203855

ABSTRACT:
A process for preparing a silicone sponge roll, which comprises uniformly mixing a foamable silicone composition comprising (A) a vinyl-free organopolysiloxane R.sub.a SiO.sub.(4-a)/2 wherein R is a monovalent hydrocarbon or hydroxyl group and a is 1.95 to 2.05, (B) a finely divided silica filler, (C) an azodicarbonamide foaming agent, and (D) a diacyl peroxide, thereafter extruding the composition through an extruder, and thereafter foaming and vulcanizing the composition. The silicon sponge roll produced is suitable to form a fixing roll for use in electrographic copying machines.

REFERENCES:
patent: 2816089 (1957-12-01), Willis
patent: 2875163 (1959-02-01), Berrige
patent: 3565858 (1971-02-01), Kniege et al.
patent: 4026846 (1977-05-01), Kittle et al.
patent: 4459247 (1984-07-01), Rothemund

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