US4421903A
Expired / Lapsed
US
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Platinum complex catalysts
Assignee: General Electric Co
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Filing: 1982-02-26
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Granted: 1983-12-20
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Expires: 2002-02-26
Abstract
Abstract Platinum complexes of unsaturated siloxanes, substantially free of inhibitory compounds, provide superior hydrosilation catalysts when produced by heating a platinum compound with an unsaturated siloxane of the formula (CH.sub.2 ═CH)((R).sub.2 Si).sub.2 O, wherein R is free of aliphatic unsaturation and is selected from alkyl, cycloalkyl, and aryl groups, the amount of siloxane being selected to provide not less than about 0.01 gram atom of platinum per mole of vinyl content, and a platinum content of not less than about 2 percent by weight in the catalyst. Curable silicone compositions containing such catalysts are also provided.
Inventors
- 👤 Bruce A. Ashby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:38
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382; C08G77/398; B; B01; B01J; B01J31/00; B01J31/02; B01J31/12; B01J31/123; B01J31/124; B01J31/126; B01J31/16; B01J31/165; B01J31/1658; B01J31/22; B01J31/2282; B01J31/2291; C07; C07F; C07F15/00; C07F15/0006; C07F15/0086; B01J2531/00; B01J2531/80; B01J2531/82; B01J2531/828
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
A storage-stable platinum-siloxane complex catalyst, substantially free of inhibitory impurities, and consisting essentially of platinum and at least one organosiloxane of the formula ##STR3## wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals and n is 0 or an integer of from 1 to 1000, said platinum and said organosiloxane having been chemically combined by heating, in the substantial absence of an acid binding agent, (i) a platinum halide with (ii) an amount of said organosiloxane sufficient to provide not less than about 0.01 gram atom of platinum per mole of vinyl content in said organosiloxane compound, and an amount of platinum in said catalyst of not substantially less than about 2.0 percent by weight, said heating being carried out for a time sufficient to insure substantially complete reaction therebetween.
Claim 2
Dependent Claim
139 words
A storage-stable platinum-siloxane complex catalyst, substantially free of inhibitory impurities, and consisting essentially of platinum and at least one organosiloxane of the formula ##STR3## wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals and n is 0 or an integer of from 1 to 1000, said platinum and said organosiloxane having been chemically combined by heating, in the substantial absence of an acid binding agent, (i) a platinum halide with (ii) an amount of said organosiloxane sufficient to provide not less than about 0.01 gram atom of platinum per mole of vinyl content in said organosiloxane compound, and an amount of platinum in said catalyst of not substantially less than about 2.0 percent by weight, said heating being carried out for a time sufficient to insure substantially complete reaction therebetween.
Claim 3
Dependent Claim
12 words
A complex catalyst as defined in claim 1 wherein R is methyl.
Claim 4
Dependent Claim
27 words
A complex catalyst as defined in claim 1 wherein the amount of platinum is within the range of from about 2.0 to about 4.0 percent by weight.
Claim 5
Dependent Claim
174 words
A composition comprising (a) an organosilicon compound containing at least one .tbd.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 storage-stable platinum-siloxane complex catalyst, substantially free of inhibitory impurities, and consisting essentially of platinum and an organosiloxane of the formula ##STR4## wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals and n is 0 or an integer of from 1 to 1000, said platinum and said organosiloxane having been chemically combined by heating, in the substantial absence of an acid binding agent, (i) a platinum halide with (ii) an amount of said organosiloxane sufficient to provide not less than about 0.01 gram atom of platinum per mole of vinyl content in said organosiloxane compound, and an amount of platinum in said catalyst of not substantially less than about 2.0 percent by weight, said heating being carried out for a time sufficient to insure substantially complete reaction therebetween.
Claim 6
Dependent Claim
174 words
A composition comprising (a) an organosilicon compound containing at least one .tbd.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 storage-stable platinum-siloxane complex catalyst, substantially free of inhibitory impurities, and consisting essentially of platinum and an organosiloxane of the formula ##STR4## wherein R is free of aliphatic unsaturation and is selected from alkyl radicals, cycloalkyl radicals and phenyl radicals and n is 0 or an integer of from 1 to 1000, said platinum and said organosiloxane having been chemically combined by heating, in the substantial absence of an acid binding agent, (i) a platinum halide with (ii) an amount of said organosiloxane sufficient to provide not less than about 0.01 gram atom of platinum per mole of vinyl content in said organosiloxane compound, and an amount of platinum in said catalyst of not substantially less than about 2.0 percent by weight, said heating being carried out for a time sufficient to insure substantially complete reaction therebetween.
Claim 7
Dependent Claim
13 words
A composition as defined in claim 4 wherein component (a) is an organohydrogenpolysiloxane.
Claim 8
Dependent Claim
33 words
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.
Claim 9
Dependent Claim
19 words
A composition as defined in claim 6 wherein said component (b) comprises a vinyl-terminated polydimethylsiloxane or a hydroxy-terminated polydimethylsiloxane.
Claim 10
Dependent Claim
16 words
A composition as defined in claim 4 wherein, in said complex catalyst (c), R is methyl.
Claim 11
Dependent Claim
31 words
A composition as defined in claim 4 wherein, in said complex catalyst (c), the amount of platinum is within the range of from about 2.0 to about 4.0 percent by weight.
Claim 12
Dependent Claim
29 words
A composition as defined in claim 4 wherein the catalytic amount of said complex catalyst (c) comprises 10 parts by weight per million parts by weight of the composition.
References Cited (Backward Citations)
US3159601A
Cited
US3159662A
Cited
US3419593A
Cited
US3383356A
Cited
US3814730A
Cited
US3775452A
Cited
US4288345A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |