abstract |
Hydrosilation catalysts are provided in the form of platinumvinylsiloxanes which are substantially free of chemically combined halogen. The platinum-vinylsiloxanes can be made by effecting removal of chemically combined halogen from a platinum halide-vinylsiloxane reaction product. The platinumvinylsiloxanes can be employed as hydrosilation catalysts to make curable organopolysiloxane compositions. |