A method for the production of in the heat to elastomeric curable masses on the basis of highly viscous organopolysiloxanes and compositions prepared in accordance with this method

摘要

1351316 Pigmented granular silicone elastomer compositions WACKER-CHEMIE GmbH 24 Nov 1971 [4 Dec 1970] 54594/71 Heading C3T An organopolysiloxane composition heatcurable to give elastomers comprises uncoloured granules of polysiloxane composition mixed with dry powdered pigment. The granules may be of conventional elastomer-forming polysiloxane compositions; suitable pigments include black, brown and red iron oxides, TiO 2 , cobalt oxide, cadmium yellow, and phthalocyanine green and blue. In Examples tubular granules comprising polydimethylsiloxane containing 0À1 to 0À5 mol. per cent methylvinylsiloxane units and of viscosity 2 x 10SP7/SP cS/25‹ C., a pyrogenic silica, a polydimethylsiloxane diol of viscosity 287 cS/25‹ C. (or polydimethylsiloxane-diphenylsiloxane diol of 500 cS/25‹ C.), and dichlorabenzoyl peroxide or dicumyl peroxide, dusted with talc, are mixed with a blue cobalt oxide/TiO 2 mixture or a phthalocyanine green/cadmium yellow/TiO 2 mixture, then extruded on to an electrical cable.