US4260780A
Expired / Lapsed
US
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Phenylmethylpolysilane polymers and process for their preparation
Assignee: United States Department of the Air Force
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Filing: 1979-11-27
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Granted: 1981-04-07
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Expires: 1999-11-27
Abstract
Abstract A phenylmethylpolysilane polymer is prepared by the addition of a small amount of phenylmethyldichlorosilane to dimethyldichlorosilane and reduction of the resulting mixture. The polymer is a gum or meltable resinous material which has utility as a precursor for preparing silicon carbide fibers.
Inventors
- 👤 Robert C. West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:25
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0803
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
39 words
A phenylmethylpolysilane polymer having the following structural formula: ##STR2## wherein Me is methyl, Ph is phenyl, the ratio of x to y varies from about 1:3 to 1:20, and z is an integer ranging from about 1 to 100.
Claim 2
Dependent Claim
39 words
A phenylmethylpolysilane polymer having the following structural formula: ##STR2## wherein Me is methyl, Ph is phenyl, the ratio of x to y varies from about 1:3 to 1:20, and z is an integer ranging from about 1 to 100.
Claim 3
Dependent Claim
70 words
A process for preparing a phenylmethylpolysilane polymer which comprises the steps of (a) mixing phenylmethyl dichlorosilane and dimethyldichlorosilane in which the mole ratio of phenylmethyldichlorosilane to dimethyldichlorosilane ranges from about 1:3 to 1:20; (b) adding the resulting mixture to a solvent containing an alkali metal reducing agent; (c) refluxing the resulting solution thereby causing a coupling reaction to occur; and (d) recovering a solid polymer from the said resulting solution.
Claim 4
Dependent Claim
70 words
A process for preparing a phenylmethylpolysilane polymer which comprises the steps of (a) mixing phenylmethyl dichlorosilane and dimethyldichlorosilane in which the mole ratio of phenylmethyldichlorosilane to dimethyldichlorosilane ranges from about 1:3 to 1:20; (b) adding the resulting mixture to a solvent containing an alkali metal reducing agent; (c) refluxing the resulting solution thereby causing a coupling reaction to occur; and (d) recovering a solid polymer from the said resulting solution.
Claim 5
Dependent Claim
18 words
A process in accordance with claim 2 in which the mole ratio of phenylmethyldichlorosilane to dimethyldichlorosilane is 1:3.9.
Claim 6
Dependent Claim
20 words
The process according to claim 2 in which the alkali metal reducing agent is sodium, potassium or a sodium-potassium alloy.
Claim 7
Dependent Claim
14 words
The process according to claim 4 in which the solvent is xylene or tetrahydrofuran.
Claim 8
Dependent Claim
18 words
The process according to claim 5 in which the solution is refluxed for at least about 24 hours.
Claim 9
Dependent Claim
21 words
The process according to claim 6 in which the solution is refluxed for a period of about 24 to 48 hours.
Claim 10
Dependent Claim
39 words
The process according to claim 5 in which the reaction is quenched at the end of the reflux period, thereby causing polymer to precipitate from solution; the polymer is separated from the solution; and the separated polymer is dried.
Claim 11
Dependent Claim
28 words
The process according to claim 8 in which the reaction is quenched first with methanol and then with an equal volume of 1 M hydrochloric acid and ethanol.
Claim 12
Dependent Claim
19 words
The process according to claim 8 in which the reaction is quenched first with hexane and then with water.
References Cited (Backward Citations)
US2563005A
Cited
US4052430A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-04-06 | 1984-10-06 | 1985-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-06 | 1988-10-06 | 1989-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-06 | 1992-10-06 | 1993-04-07 | $7700.00 | Window Closed / Lapsed |