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US 4,705,765 AGranted
Hydrosilylation catalyst, method for making and use
AssigneeGeneral Electric Company
InventorLarry N. Lewis
Life of this patent
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Abstract
A colloidal hydrosilylation catalyst is provided by effecting reaction between a silicon hydride or a siloxane hydride and a Pt(O) or Pt(II) catalyst. The colloidal catalyst forms stable mixtures with olefinically unsaturated organopolysiloxanes.
Claims6
A colloidal hydrosilylation catalyst comprising,
- (A) the reaction product of
- (i) a silicon hydride or siloxane hydride, and
- (ii) a platinum Pt(O) or Pt(II) complex, and
- (B) 2 to 20 parts by weight of aprotic solvent, per part of (A),
- where there is utilized in (A), 6 to 50 moles of .tbd.SiH in (i), per mole of Pt in (ii).
2 more elements
A mixture comprising an olefinically unsaturated organopolysiloxane having the formula, ##STR5## and 5 parts per million to 200 parts per million of platinum in the form of colloidal hydrosilylation catalyst comprising,
- (A) the reaction product of
- (i) a silicon hydride or siloxane hydride,
- (ii) a platinum Pt(O) or Pt(II) complex, and
- (B) 2 to 20 parts by weight of aprotic solvent, per part of (A),
- where R is a member selected from the class consisting of C.sub.(1-14) monovalent hydrocarbon radicals and substituted C.sub.(1-14) monovalent hydrocarbon radicals, R.sup.1 is a C.sub.(1-10) olefinically unsaturated aliphatic radical, a is a whole number having a value of 0 to 3 inclusive and b has an average value of 0.005 to 2.0 inclusive.
2 more elements
Dependencies are inferred from the claim text.