compositions organopolisilossaniche induribili to give elastomers which produce forms.

摘要

Organopolysiloxane compositions comprising, per 100 parts by weight of an alpha , omega - dihydroxydiorganopolysiloxane oil having a viscosity of 600 to 100,000 mPa.s at 25 DEG C, 1.5 to 12 parts of trialkoxysilanes or tetraalkoxysilanes or products resulting from the hydrolysis of tetraalkoxysilanes, 10 to 150 parts of fillers, dihydroxypolysiloxane oils having a viscosity of 10 to 350 mPa.s at 25 DEG C and catalysts (R''COOO)2SnQ2 wherein R'' is an aliphatic hydrocarbon and Q an alkyl radical are characterised in that the oils having a viscosity of 10 to 350 mPa.s are used at a rate of 7 to 23 parts per part of tin, and in that the catalysts are introduced so as to provide 0.22 to 1 part of tin per 100 parts of the compositions. These compositions are used for the production of moulds, in particular for moulding polyurethanes.