Room temperature vulcanizable organopolysiloxane compound to give an elastomer and novel organopolysiloxane polycondensation catalysts

摘要

The present invention relates to an organopolysiloxane composition that can be vulcanized at room temperature into an elastomer that is crosslinked by polycondensation and that does not contain alkyltin-based catalysts and also to novel organopolysiloxane polycondensation catalysts.

主权项

1. An organopolysiloxane composition, comprising a silicone base B capable of curing via polycondensation reaction into a silicone elastomer comprising a polydimethylsiloxane, with hydroxyl end groups, optionally prefunctionalized by a silane so as to have functionalized ends selected from the group consisting of alkoxy, oxime, and enoxy type; and a catalytically effective amount of at least one polycondensation catalyst which is a metal complex or salt A of formula (1):
[Zn(L1)(L2)]  (1) in which: the symbols L1 and L2 are identical or different and represent a ligand which is a β-dicarbonylato anion; and with the supplementary condition that the metal complex or salt A of formula (1) is not the zinc diacetylacetonate or Zn(acac)2 compound,wherein the polycondensation catalyst is selected from the group consisting of the complexes (3) to (6) below:(3): Zn(DPM)2 or [Zn(t-Bu-acac)2] where DPM=(t-Bu-acac)=the 2,2,6,6-tetramethyl-3,5-heptanedionato anion;(4): [Zn(EAA)2] where EAA=the ethyl acetoacetato anion;(5): [Zn(iPr-AA)2] where iPr-AA=the isopropyl acetoacetato anion; and