| abstract |
Polyorganosiloxane compositions which can be stored in the absence of moisture and which harden rapidly in the presence of moisture, comprising a mixture of (1) 100 parts by weight of an alpha , omega -dihydroxypolydimethylsiloxane having a viscosity of from 0.1 to 1000 Pas, (2) 0 to 100 parts by weight of an alpha , omega -bis-(trimethylsiloxy)-polydimethylsiloxane having a viscosity of from 0.04 to 10 Pas as plasticizer, (3) 1 to 10 parts by weight of an oximinosilane corresponding to the following formula <IMAGE> in which R preresents C1-C4 alkyl or alkenyl radicals, R1 and R2 each represent a C1-C4 alkyl radical or hydrogen or R1 and R2 together represent a C4 or C5 alkylene radical and a may assume the value 0 or 1, (4) 5 to 250 parts by weight of a reinforcing or non-reinforcing filler of filler mixture, (5) 0 to 2.5 parts by weight of an aminoalkyl alkoxysilane containing one or more basic nitrogen atoms attached to a silicon through at least 3 C atoms and (6) 0.01 to 0.5 part by weight tin in the form of a tin catalyst, wherein the tin catalyst is a solution of dialkyltin oxides corresponding to the following formula <IMAGE> in which R3 may represent a linear or branched C3-C18 alkyl radical, in aminoalkyl alkoxysilanes. |