US4608242A
Expired / Lapsed
US
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Hydrosilyl-modified polycarbosilane precursors for silicon carbide
Assignee: General Electric Co
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Filing: 1984-06-22
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Granted: 1986-08-26
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Expires: 2004-06-22
Abstract
Abstract A novel branched hydrosilyl-modified polycarbosilane which can be pyrolized to obtain improved yields of silicon carbide. This novel branched hydrosilyl-modified polycarbosilane can be prepared in a one-step reaction from mixtures of silane monomers containing vinyl or halomethyl moieties with silane monomers containing hydrosilyl groups.
Inventors
- 👤 Curtis L. Schilling, Jr.
- 👤 Thomas C. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:48
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803; C07F7/0805
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
A process for producing silicon carbide ceramic compositions which comprises a one-step, direct pyrolysis in an inert atmosphere of a branched hydrosilyl-modified polycarbonsilane comprising units of the formula ##STR6## wherein R is a lower alkyl, a is 0 or 1, b is 0-3, c is 0-4, d is 0-4, and a+b+c+d totals 4, with the proviso that, in different units, a, b, c, d, and R may differ, but that, in at least one unit, a+d must total 1 or more and units of the formula ##STR7## wherein R is defined as above, g is 1-2, e is 0-2, f is 1-3, and g+e+f totals 4.
Claim 2
Dependent Claim
106 words
A process for producing silicon carbide ceramic compositions which comprises a one-step, direct pyrolysis in an inert atmosphere of a branched hydrosilyl-modified polycarbonsilane comprising units of the formula ##STR6## wherein R is a lower alkyl, a is 0 or 1, b is 0-3, c is 0-4, d is 0-4, and a+b+c+d totals 4, with the proviso that, in different units, a, b, c, d, and R may differ, but that, in at least one unit, a+d must total 1 or more and units of the formula ##STR7## wherein R is defined as above, g is 1-2, e is 0-2, f is 1-3, and g+e+f totals 4.
Claim 3
Dependent Claim
152 words
The process of claim 1 for producing silicon carbide ceramic compositions which comprises pyrolyzing in an inert atmosphere a branched, hydrosilyl-modified polycarbonsilane which has been produced by reacting, with an active metal in an inert solvent or mixture of inert solvents at an elevated temperature, a compound system comprising one or more monomers of the formula (CH.sub.2 ═CH).sub.a R.sub.b SiX.sub.c (CH.sub.2 X).sub.d where R is lower alkyl, X is halo, a is 0 or 1, b is 0-3, c is 0-4, d is 0-4, a+b+c+d total 4, and a +c+d totals at least 1, and one or more monomers of the formula H.sub.g R.sub.e SiX.sub.f wherein R and X are defined as above, g is 1 or 2, e is 0-2, f is 1-3, and g+e+f totals 4, said compound system being selected such that its average molar functionality is at least 2.3 and the formation of silicon carbon bonds is favored.
Claim 4
Dependent Claim
12 words
The silicon carbide ceramic composition produced by the process of claim 1.
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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) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |