Hydrosilylation catalyst, method for making and use

• US 4,705,765 A
• Filed: 03/02/1987
• Issued: 11/10/1987
• Est. Priority Date: 12/19/1985
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Lewis, Larry N.
• Primary Examiner(s): Metz, Andrew
• Assistant Examiner(s): Wright, William G.
• Application Number:
  US07/021,037
• Time in Patent Office: 253 Days
• Field of Search: 502/152, 502/158, 502/161, 502/162, 502/167
• US Class Current: 502/152
• CPC Class Codes: C07F 15/0086 Platinum compounds
• CPC Class Codes: C07F 7/0801 General processes

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.

Claims

1. 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. The colloid catalyst in accordance with claim 1, resulting from the reaction of a platinum(O) complex with a silicon hydride or siloxane hydride.

3. The colloid catalyst in accordance with claim 1, resulting from the reaction of a silicon hydride or siloxane hydride with a platinum(II) complex.

4. A colloid complex in accordance with claim 1, resulting from the reaction of a platinum(O) complex with a silicon hydride or siloxane hydride having vinyl siloxane ligands.

5. 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, R¹ 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.

6. A mixture in accordance with claim 5, comprising a vinyl siloxane and 5 parts per million to 200 parts per million of platinum in the form of a colloid catalyst comprising a colloidal hydrosilylation catalyst comprising:

(A) the reaction product of

(i) a silicon hydride or siloxane hydride, and

(ii) from 6 to 50 moles of .tbd.SiH of (i) per mole of platinum in a Pt(O) or Pt(II) complex of at least one ligand selected from a member of the class consisting of phosphines, halides, C.sub.(1-8) alkyl radicals, C.sub.(6-14) aryl radicals, C.sub.(1-8) aliphatically unsaturated organic radicals, cyanide and carbon monoxide, and

(B) 2 to 20 parts by weight of aprotic solvent per part of (A).