Process for preparation of a catalyst of hidrossililicacao platinum olefin complex, complex of platinum trieno and composition organopolissilaxanica

摘要

Novel platinum/olefin complexes, useful for the hydrosilylation curing catalysis of hardenable organopolysiloxane compositions, are facilely prepared by reacting a platinum halide with at least one alkali or alkaline earth metal carbonate or bicarbonate in the presence of an aliphatic triene ligand having the general formula: IMAGE (I) wherein R1 is a linear or branched chain alkyl radical having from 1 to 6 carbon atoms, and R2 is R1 or a linear or branched chain alkenyl radical having from 2 to 16 carbon atoms and at least one site of ethylenic unsaturation, and said complex having a ratio, in gram-atoms of halogen to gram-atoms of platinum, ranging from virtually 0 to 4.