Platinum complex

• US 4,288,345 A
• Filed: 02/06/1980
• Issued: 09/08/1981
• Est. Priority Date: 02/06/1980
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Modic, Frank J., Ashby, Bruce A.
• Primary Examiner(s): SNEED, HELEN
• Application Number:
  US06/119,014
• Time in Patent Office: 580 Days
• Field of Search: 260/429 R, 252/431 R, 528/15, 528/31, 528/32
• US Class Current: 528/15
• CPC Class Codes: B01J 2231/323 Hydrometalation, e.g. bor-, alumin-, silyl-, zirconation or analoguous reactions like carbometalation, hydrocarbation
• CPC Class Codes: B01J 2531/828 Platinum
• CPC Class Codes: B01J 31/124 Silicones or siloxanes or comprising such units
• CPC Class Codes: B01J 31/1608 the ligands containing silicon
• CPC Class Codes: B01J 31/2291 Olefins
• CPC Class Codes: C07F 15/0086 Platinum compounds
• CPC Class Codes: C08G 77/12 containing silicon bound to hydrogen C08G77/045 takes precedence
• CPC Class Codes: C08G 77/16 to hydroxyl groups
• CPC Class Codes: C08G 77/20 containing silicon bound to unsaturated aliphatic groups C08G77/045 takes precedence
• CPC Class Codes: C08L 83/00 Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
• CPC Class Codes: C08L 83/04 Polysiloxanes

Abstract

Platinum complexes of unsaturated siloxanes, substantially free of inorganic halogen and inhibitory compounds, provide superior hydrosilation catalysts when the unsaturated siloxane comprises, per gram-atom of platinum,

(i) a combination of one mole of (CH₂ ═CH)((R)₂ Si)₂ O, and one mole of (CH₂ ═CH) (R)₂ SiOSi(R₂)OH;

(ii) two moles of (CH₂ ═CH)((R)₂ Si)₂ O; or

(iii) a mixture of (i) and (ii),

wherein R is free of aliphatic unsaturation and is selected from alkyl, cycloalkyl, and aryl groups.

Claims

1. A platinum-siloxane complex catalyst, substantially free of inhibitory impurities and detectable inorganic halogen, and consisting essentially of

(i) one gram-atom of chemically combined platinum and one mole each of an organosiloxane of the formula ##STR5## (ii) one gram-atom of chemically combined platinum and two moles of an organosiloxane of the formula ##STR6## (iii) a combination of (i) and (ii);

wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals.

2. A complex catalyst as defined in claim 1 wherein R is methyl.

3. A complex catalyst as defined in claim 1 wherein, in said combination (iii), component (ii) comprises a minor proportion by weight.

4. A curable composition comprising

(a) an organosilicon compound containing at least one ═

SiH bond;

(b) an organic compound containing an aliphatic unsaturated group, a hydroxyl group, or a mixture of such groups; and

(c) a catalytic amount of a platinum-siloxane complex catalyst

substantially free of inhibitory impurities and detectable inorganic halogen, and consisting essentially of

(i) one gram-atom of chemically combined platinum and one mole each of an organosiloxane of the formula ##STR7## (ii) one gram-atom of chemically combined platinum and two moles of an organosiloxane of the formula ##STR8## (iii) a combination of (i) and (ii);

wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals.

5. A composition as defined in claim 4 wherein component (a) is an organohydrogenpolysiloxane.

6. A composition as defined in claim 4 wherein component (b) is an organosilicon compound containing at least one silicon-bonded aliphatic unsaturated group, or an organosilicon compound containing at least one silicon-bonded hydroxyl group.

7. A composition as defined in claim 6 wherein said component (b) comprises a vinyl-terminated polydimethylsiloxane or a hydroxy-terminated polydimethylsiloxane.

8. A composition as defined in claim 4 wherein, in said complex catalyst (c), R is methyl.

9. A composition as defined in claim 4 wherein said complex catalyst (c) comprises predominantly that defined under (i).

10. A composition as defined in claim 4 wherein said complex catalyst (c) consists essentially of that defined under (i) and wherein R is methyl.