US4879317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing silicone foam density and silicone foam compositions
Assignee: General Electric Co
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Filing: 1989-01-24
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Granted: 1989-11-07
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Expires: 2009-01-24
Abstract
Abstract A method is provided for reducing the density of silicone foam resulting from the generation of hydrogen gas by employing a hydride polysiloxane in the form of a mixture of linear hydride polysiloxane and cyclic hydride polysiloxane. Aqueous methanol is also found to be an effective density-reducing agent.
Inventors
- 👤 Kennith A. Smith
- 👤 Connie L. Haig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:00
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08J2383/00; C08J2383/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
A foamable composition comprising by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5-50 parts of a hydride polysiloxane consisting essentially of a mixture of 20% to 85% by weight of a substantially linear hydride polysiloxane and 15% to 80% by weight of cyclic hydride polysiloxane, (C) 0.2-10 parts of a hydroxylated material consisting essentially of a mixture of 0% to 40% by weight of a C.sub.(1-8) alkanol and 60% to 100% by weight of water, and (D) an effective amount of a platinum catalyst.
Claim 2
Dependent Claim
86 words
A foamable composition comprising by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5-50 parts of a hydride polysiloxane consisting essentially of a mixture of 20% to 85% by weight of a substantially linear hydride polysiloxane and 15% to 80% by weight of cyclic hydride polysiloxane, (C) 0.2-10 parts of a hydroxylated material consisting essentially of a mixture of 0% to 40% by weight of a C.sub.(1-8) alkanol and 60% to 100% by weight of water, and (D) an effective amount of a platinum catalyst.
Claim 3
Dependent Claim
18 words
A foamable composition in accordance with claim 1, where the vinyl terminated polydiorganosiloxane is a vinyl terminated polydimethylsiloxane.
Claim 4
Dependent Claim
19 words
A foamable composition in accordance with claim 1, where the hydroxylated material is a mixture of methanol and water.
Claim 5
Dependent Claim
16 words
A foamable composition in accordance with claim 1, where the platinum catalyst is a platinum vinyldisiloxane.
Claim 6
Dependent Claim
17 words
A foamable composition in accordance with claim 1, where the cyclic hydride polysiloxane is a hydride cyclotetrasiloxane.
Claim 7
Independent Claim
100 words
A method for making silicone foam having a reduced foam density comprising agitating a mixture of ingredients comprising, by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5-50 parts of a hydride polysiloxane consisting essentially of a mixture of 20% to 85% by weight of a substantially linear hydride polysiloxane and 15% to 80% by weight of cyclic hydride polysiloxane, (C) 0.2-10 parts of a hydroxylated material consisting essentially of a mixture of 0% to 40% by weight of a C.sub.(1-8) alkanol and 60% to 100% by weight of water, and (D) an effective amount of a platinum catalyst.
Claim 8
Independent Claim
100 words
A method for making silicone foam having a reduced foam density comprising agitating a mixture of ingredients comprising, by weight, (A) 100 parts of a vinyl-terminated polydiorganosiloxane, (B) 0.5-50 parts of a hydride polysiloxane consisting essentially of a mixture of 20% to 85% by weight of a substantially linear hydride polysiloxane and 15% to 80% by weight of cyclic hydride polysiloxane, (C) 0.2-10 parts of a hydroxylated material consisting essentially of a mixture of 0% to 40% by weight of a C.sub.(1-8) alkanol and 60% to 100% by weight of water, and (D) an effective amount of a platinum catalyst.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |