US4771118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing organic silazane polymers and process for manufacturing ceramics from the polymers
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1986-09-03
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Granted: 1988-09-13
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Expires: 2006-09-03
Abstract
Abstract A process for manufacturing an organic silazane polymer which comprises reacting ammonia with a mixture of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane to obtain an ammonolysis product. The ammonolysis product is polymerized in the presence of a basic catalyst capable of deprotonation to obtain an organic silazane polymer. The silazane polymer may be further melted, shaped and infusibilized. The thus infusibilized product is finally sintered to obtain a ceramic material.
Inventors
- 👤 Minoru Takamizawa
- 👤 Mitsuo Umemura
- 👤 Masato Kanari
- 👤 Yoshihumi Takeda
- 👤 Akira Hayashida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:22
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C08; C08G; C08G77/00; C08G77/60; C08G77/62
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
46 words
A process for manufacturing an organic silazane polymer which comprises reacting ammonia with a mixture of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane to obtain an ammonolysis product, and polymerizing the ammonolysis product in the presence of a basic catalyst capable of deprotonation to obtain an organic silazane polymer.
Claim 2
Dependent Claim
46 words
A process for manufacturing an organic silazane polymer which comprises reacting ammonia with a mixture of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane to obtain an ammonolysis product, and polymerizing the ammonolysis product in the presence of a basic catalyst capable of deprotonation to obtain an organic silazane polymer.
Claim 3
Dependent Claim
35 words
A process according to claim 1, wherein mixing ratios of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane are in ranges of 55 to 80 mole %, 10 to 30 mole % and 5 to 25 mole %, respectively.
Claim 4
Dependent Claim
19 words
A process according to claim 1, wherein said basic catalyst is KH, NaH, NaNH 2 or KNH 2 .
Claim 5
Dependent Claim
16 words
A process according to claim 1, wherein the ammonolysis reaction is effected in an inert solvent.
Claim 6
Dependent Claim
25 words
A process according to claim 1, wherein the polymerization reaction is effected in an inert solvent at a temperature of from 0° to 200° C.
Claim 7
Dependent Claim
25 words
A process according to claim 1, further comprising adding an electrophilic compound after completion of the polymerization reaction whereby the remaining basic catalyst is decomposed.
Claim 8
Dependent Claim
31 words
The process of claim 1 wherein the basic catalyst is selected from the group consisting of alkali metal hydrides, alkaline earth metal hydrides, alkali metal amides and alkaline earth metal amides.
Claim 9
Dependent Claim
39 words
An organic silazane polymer obtained by a process comprising reacting ammonia with a mixture of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane to obtain an ammonolysis product, and polymerizing the ammonolysis product in the presence of a basic catalyst capable of deprotonation.
Claim 10
Dependent Claim
39 words
An organic silazane polymer obtained by a process comprising reacting ammonia with a mixture of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane to obtain an ammonolysis product, and polymerizing the ammonolysis product in the presence of a basic catalyst capable of deprotonation.
Claim 11
Dependent Claim
37 words
An organic silazane polymer according to claim 8, wherein mixing ratios of methyldichlorosilane, methyltrichlorosilane and dimethyldichlorosilane are in ranges of 55 to 80 mole % 10 to 30 mole % and 5 to 25 mole %, respectively.
Claim 12
Dependent Claim
38 words
An organic silazane polymer according to claim 9, wherein the silazane polymer has a melting point of from 60° to 200° C and an intrinsic viscosity of from 0.06 to 0.09 as determined in benzene at 20° C.
Claim 13
Dependent Claim
31 words
The polymer of claim 8 wherein the basic catalyst is selected from the group consisting of alkali metal hydrides, alkaline earth metal hydrides, alkali metal amides and alkaline earth metal amides.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-13 | 1992-03-14 | 1992-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-13 | 1996-03-14 | 1996-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-13 | 2000-03-14 | 2000-09-13 | $7700.00 | Window Closed / Lapsed |