Complex platinum catalysts for hydrosilation reactions

Details Complex platinum catalysts for hydrosilation reactions Complex platinum catalysts for hydrosilation reactions

C - Chemistry, Metallurgy

08

G

402/16, 400/5328

C08G 77/04 (2006.01) A61C 9/00 (2006.01) A61K 6/10 (2006.01) C08K 5/56 (2006.01)

Patent

CA 1122604

ABSTRACT OF THE DISCLOSURE An improved catalytic process is provided for the addition of Si-bonded hydrogen to an aliphatic multiple bond or for curing, a mixture of an organopolysiloxane containing alkenyl groups, and an organopolysilox- une containing silicon-bonded hydrogen atoms, or for preparing a dental impression from such mixture. The reaction takes place in the presence of a platinum catalyst selected from the group consisting of (I) XPtY, (II) Image , (III)APt(Y')X" and mixtures thereof. In such catalyst A is a halogen, X is an unsubstituted hydrocarbon radical or a substituted such hydrocarbon radical,substituted with an alkoxy or acyloxy group and has from 1 to 3 aliphatic double bonds,which is bonded to the platinum atom via a PtC-sigma bond and a Pt-olefin-Pi-bond, X' is a hydrocarbon radical substituted with an alkoxy or acyloxy group and has from l to 3 double bonds and is bonded to the platinum atom via a PtC- sigma bond and a Pt-olefin-Pi-bond, X" is an unsubstituted hydrocarbon or a substituted such hydrocarbon substituted with an alkoxy or acyloxy group and has an aliphatic double bond which is bonded to the platinum atom via a Pt-olefln-Pi-bond, Y is a chelated beta-diketonate ligand or arylcar- boxylate ligand, Y' is a beta-diketonate ligand and Z is a double link bridge ligand. The catalysts above described are substantially more effective for catalyzing the respective reactions than the catalysts known heretofore.

304414

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