US4091196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reproducibly preparing a low-melting high-carbon yield precursor
Assignee: United States Department of Energy
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Filing: 1977-06-21
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Granted: 1978-05-23
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Expires: 1997-06-21
Abstract
Abstract The present invention is directed to a method for preparing a reproducible synthetic carbon precursor by the autoclave polymerization of indene (C9H8) at a temperature in the range of 470 DEG -485 DEG C, and at a pressure in the range of about 1000 to about 4300 psi. Volatiles in the resulting liquid indene polymer are removed by vacuum outgassing to form a solid carbon precursor characterized by having a relatively low melting temperature, high-carbon yield, and high reproducibility which provide for the fabrication of carbon and graphite composites having strict requirements for reproducible properties.
Inventors
- 👤 Wesley E. Smith
- 👤 Bradley Napier, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:30
CPC Classifications
C; C08; C08F; C08F244/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
A method for preparing a thermoplastic carbon precursor comprising the steps of confining indene in an autoclave containing an inert atmosphere, heating the indene to a tempertaure in the range of 470°-485° C. at a pressure in the range of about 1000 to 4300 psi for a duration sufficient to convert the indene to a liquid polymer, reducing the temperature and pressure to ambient conditions, and thereafter vacuum outgassing volatiles from the liquid polymer to provide a solid polymer having a melting temperature in the range of about 40°-105° C., a viscosity in the range of about 880-26,800 centipoises, and a carbon yield in the range of about 52-66 weight percent.
Claim 2
Independent Claim
111 words
A method for preparing a thermoplastic carbon precursor comprising the steps of confining indene in an autoclave containing an inert atmosphere, heating the indene to a tempertaure in the range of 470°-485° C. at a pressure in the range of about 1000 to 4300 psi for a duration sufficient to convert the indene to a liquid polymer, reducing the temperature and pressure to ambient conditions, and thereafter vacuum outgassing volatiles from the liquid polymer to provide a solid polymer having a melting temperature in the range of about 40°-105° C., a viscosity in the range of about 880-26,800 centipoises, and a carbon yield in the range of about 52-66 weight percent.
Claim 3
Dependent Claim
48 words
The method according to claim 1, wherein said duration sufficient to convert the indene to a liquid polymer is in the range of 1 to 3 hours, and wherein the outgassing step is achieved at a temperature of 100° C. for a duration of 20 to 24 hours.
Claim 4
Dependent Claim
84 words
A thermoplastic carbonizable material comprising polymerized indene derived from heating indene in an inert atmosphere at a temperature in the range of 470°-485° C. and at a pressure in the range of about 1000 to 4300 psi and outgassing the resulting liquid polymer for converting the indene to a solid thermoplastic polymer, said polymer being further characterized by possessing a melting temperature in the range of 40° to 105° C. and a carbon yield in the range of about 52 to 66 weight percent.
Claim 5
Dependent Claim
84 words
A thermoplastic carbonizable material comprising polymerized indene derived from heating indene in an inert atmosphere at a temperature in the range of 470°-485° C. and at a pressure in the range of about 1000 to 4300 psi and outgassing the resulting liquid polymer for converting the indene to a solid thermoplastic polymer, said polymer being further characterized by possessing a melting temperature in the range of 40° to 105° C. and a carbon yield in the range of about 52 to 66 weight percent.
References Cited (Backward Citations)
US2373714A
Cited
US3574653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |