US4581391A
Expired / Lapsed
US
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Ablative insulating materials of high vinyl content
Assignee: United States Department of the Navy
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Filing: 1984-12-17
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Granted: 1986-04-08
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Expires: 2004-12-17
Abstract
Abstract The use of high vinyl-containing vinylmethylsiloxane polymers as high temperature insulating materials.
Inventors
- 👤 James C. Baldwin
- 👤 Gary W. Meyers
- 👤 Robert A. Rhein
- 👤 Kenneth J. Wynne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:17
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K3/36; C08K7/00; C08K7/02; C08K7/04; C08K7/06; C08L; C08L83/00; C08L83/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
50 words
A high temperature insulating composition consisting essentially of: about 40-45 mole percent of a vinyl-containing siloxane base polymer; about 50 mole percent of filler selected from the group comprising: silica, silicon carbide and carbon fiber; about 5-9 mole percent of polymethylhydrodimethylsiloxane copolymer; and about 0.25-0.75 mole percent of chloroplatinic acid.
Claim 2
Dependent Claim
50 words
A high temperature insulating composition consisting essentially of: about 40-45 mole percent of a vinyl-containing siloxane base polymer; about 50 mole percent of filler selected from the group comprising: silica, silicon carbide and carbon fiber; about 5-9 mole percent of polymethylhydrodimethylsiloxane copolymer; and about 0.25-0.75 mole percent of chloroplatinic acid.
Claim 3
Dependent Claim
15 words
The composition of claim 1 wherein said chloroplatinic acid contains 3-3.5% platinum in cyclic vinylsiloxane.
Claim 4
Dependent Claim
20 words
The composition of claim 1 wherein said siloxane base polymer has a molecular weight within the range of about 22,000-24,000.
Claim 5
Dependent Claim
23 words
The composition of claim 1 wherein said siloxane base polymer has a viscosity at 25°-28° C. within the range of about 650-1690 centipoises.
Claim 6
Dependent Claim
12 words
The composition of claim 1 wherein said siloxane base polymer is vinylmethylsiloxane.
Claim 7
Dependent Claim
33 words
The composition of claim 1 wherein said siloxane base polymer is a copolymer comprising from about 25 to about 99 mole percent vinylmethylsiloxane and from about 1 to about 75 mole percent dimethylsiloxane.
Claim 8
Dependent Claim
20 words
The polymer of claim 6 wherein said copolymer comprises about 25 mole percent vinylmethylsiloxane and about 75 mole percent dimethylsiloxane.
Claim 9
Dependent Claim
20 words
The polymer of claim 6 wherein said copolymer comprises about 50 mole percent vinylmethylsiloxane and about 50 mole percent dimethylsiloxane.
Claim 10
Dependent Claim
20 words
The polymer of claim 6 wherein said copolymer comprises about 75 mole percent vinylmethylsiloxane and about 25 mole percent dimethylsiloxane.
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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) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |