Patent US4840974A successfully refreshed from Google Patents.
US4840974A
Expired / Lapsed
US
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Method for reducing silicone foam density and silicone foam compositions
Assignee: General Electric Co
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Filing: 1988-12-05
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Granted: 1989-06-20
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Expires: 2008-12-05
Abstract
Abstract A method is provided for reducing the density of silicone foam from a platinum catalyzed foamable two-package mixture of vinyl organosiloxane, organohydrogen siloxane, and hydroxylated material. The platinum catalyst used in the foamable mixture is in the form of a mixture of a platinum vinyl siloxane and a platinum triarylphosphine. A platinum catalyst mixture of platinum vinylsiloxane and triarylphosphine also has been found effective.
Inventors
- 👤 David C. Gross
- 👤 Larry N. Lewis
- 👤 Connie L. Haig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:59
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
97 words
A foamable composition comprising by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5 to 50 parts of a hydride polysiloxane, (C) 0.2 to 10 parts of a hydroxylated material, and (D) an effective amount of a platinum catalyst comprising (i) platinum vinyl siloxane complex, and (ii) a member selected from a platinum triarylphosphine and a triarylphosphine, where there is present in the platinum catalyst, per part by weight of platinum of the platinum vinyl siloxane complex, from 0.2 to 4 parts of platinum of the platinum triarylphosphine or 0.2 to 3 parts of the triarylphosphine.
Claim 2
Dependent Claim
97 words
A foamable composition comprising by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5 to 50 parts of a hydride polysiloxane, (C) 0.2 to 10 parts of a hydroxylated material, and (D) an effective amount of a platinum catalyst comprising (i) platinum vinyl siloxane complex, and (ii) a member selected from a platinum triarylphosphine and a triarylphosphine, where there is present in the platinum catalyst, per part by weight of platinum of the platinum vinyl siloxane complex, from 0.2 to 4 parts of platinum of the platinum triarylphosphine or 0.2 to 3 parts of the triarylphosphine.
Claim 3
Dependent Claim
17 words
A foamable composition in accordance with claim 1, having 0.5% to 10% by weight of fumed silica.
Claim 4
Dependent Claim
16 words
A foamable composition in accordance with claim 1, where the vinyl-terminated polydiorganosiloxane is a vinyl-terminated polydimethylsiloxane.
Claim 5
Dependent Claim
14 words
A foamable composition in accordance with claim 1, where the hydroxylated material is water.
Claim 6
Dependent Claim
22 words
A foamable composition in accordance with claim 1, where the platinum catalyst is a mixture of a platinum vinylsiloxane and platinum triarylphosphine.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |