Organopolysiloxane composition suitable for vulcanisation into an elastomer at room temperature and new organopolysiloxane polycondensation catalysts

摘要

The present invention relates to an organopolysiloxane composition which is suitable for vulcanization into an elastomer as from room temperature, and which crosslinks via polycondensation, as well as to new organopolysiloxane polycondensation catalysts.

主权项

1. A composition comprising:
at least one organosilicon compound A comprising at least two identical or different hydrolyzable and condensable groups, or at least two silanol functions ≡SiOH, at least one crosslinking agent B, optionally at least one filler C, and a catalytically effective amount of at least one polycondensation catalyst M which is a zinc complex comprising in its structure two types of ligand: carboxylate and amine, in which the polycondensation catalyst(s) M is obtained: a) by reacting per 1 mol of at least one zinc dicarboxylate of formula [Zn(carboxylate)2] or of a mixture of two different zinc dicarboxylates mol of amine or a mixture of amines optionally in the presence of a solvent, so as to obtain a reaction product comprising:
x mol of a zinc complex A which is a [(Zn(carboxylate)2(amine)] complex,y mol of a zinc complex B which is a [(Zn(carboxylate)2(amine)2] complex,with x≧0, y≧0,optionally X3 mol of unreacted zinc dicarboxylate, andoptionally X4 mol of residual unreacted amine, and b) after optionally removing the solvent and the residual amine, the polycondensation catalyst(s) M are recovered in the form of at least one zinc complex A, at least one zinc complex B or a mixture of zinc complex A and of zinc complex B, with optionally a residual amount of X3 mol of the complex [Zn(carboxylate)2], and
the symbols X1, X3 and X4 are numbers and the sum x+y+X3=1.