US5032649A
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Organic amide-modified polysilazane ceramic precursors
Assignee: Clariant Finance BVI Ltd
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Filing: 1989-11-27
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Granted: 1991-07-16
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Expires: 2009-11-27
Abstract
Abstract Silazane polymers are prepared by (1) reacting ammonia with one or more halogenated organic silicon compounds containing an Si-H bond to produce a silazane ammonolysis product, (2) mixing the ammonolysis product with 0.1% to 30% by weight of an organic amide or thioamide, and (3) heating to a temperature of 30° to 300° C. Silazane polymers containing alkenyl or alkynyl groups can be cured by supplying energy to generate free radicals. The cured or uncured polymers can be pyrolyzed to produce silicon nitride-containing ceramic materials.
Inventors
- 👤 Joanne M. Schwark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:17
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: 16
Claim 1
Independent Claim
140 words
A process for preparing a silazane polymer comprising (1) preparing a silazane ammonolysis product by reacting ammonia with a halogenated silicon compound selected from the group consisting of RSiX 3 , RR'SiX 2 and mixtures thereof, wherein X is selected from the group consisting of Cl, Br and I; and R and R' are the same or different and are selected from the group consisting of H, substituted or unsubstituted 1-6 carbon alkyl, aryl, 2-6 carbon alkenyl and 2-6 carbon alkynyl groups, wherein the reaction mixture contains at least one halogenated silicon compound having a Si--H bond, (2) mixing the silazane ammonolysis product with from about 0.1% to about 30% by weight, based on the weight of the ammonolysis product, of an organic amide or thioamide, and (3) heating to a temperature of from about 30° to about 300° C.
Claim 2
Dependent Claim
140 words
A process for preparing a silazane polymer comprising (1) preparing a silazane ammonolysis product by reacting ammonia with a halogenated silicon compound selected from the group consisting of RSiX 3 , RR'SiX 2 and mixtures thereof, wherein X is selected from the group consisting of Cl, Br and I; and R and R' are the same or different and are selected from the group consisting of H, substituted or unsubstituted 1-6 carbon alkyl, aryl, 2-6 carbon alkenyl and 2-6 carbon alkynyl groups, wherein the reaction mixture contains at least one halogenated silicon compound having a Si--H bond, (2) mixing the silazane ammonolysis product with from about 0.1% to about 30% by weight, based on the weight of the ammonolysis product, of an organic amide or thioamide, and (3) heating to a temperature of from about 30° to about 300° C.
Claim 3
Dependent Claim
28 words
The process of claim 1 wherein the halogenated silicon compound additionally comprises RR'R"SiX, SiX 4 or mixtures thereof, wherein R" has the same meaning as R and R'.
Claim 4
Dependent Claim
31 words
The process of claim 1 wherein the halogenated silicon compound is reacted with a mixture of ammonia and a substituted or unsubstituted 1-4 carbon alkyl or aryl amine in step (1).
Claim 5
Dependent Claim
9 words
The polymer prepared by the process of claim 1.
Claim 6
Dependent Claim
9 words
The polymer prepared by the process of claim 2.
Claim 7
Dependent Claim
9 words
The polymer prepared by the process of claim 3.
Claim 8
Dependent Claim
35 words
The product prepared by supplying energy to generate free radicals to cross-link the polymer of claim 4, wherein at least one of the groups R and R' is a 2-6 carbon alkenyl or alkynyl group.
Claim 9
Dependent Claim
35 words
The product prepared by supplying energy to generate free radicals to cross-link the polymer of claim 5, wherein at least one of the groups R and R' is a 2-6 carbon alkenyl or alkynyl group.
Claim 10
Dependent Claim
35 words
The product prepared by supplying energy to generate free radicals to cross-link the polymer of claim 6, wherein at least one of the groups R and R' is a 2-6 carbon alkenyl or alkynyl group.
Claim 11
Dependent Claim
30 words
A process for preparing a silicon nitride-containing ceramic material comprising heating the polymer of claim 4 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
Claim 12
Dependent Claim
30 words
A process for preparing a silicon nitride-containing ceramic material comprising heating the polymer of claim 5 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
Claim 13
Dependent Claim
30 words
A process for preparing a silicon nitride-containing ceramic material comprising heating the polymer of claim 6 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
Claim 14
Dependent Claim
30 words
A process for preparing a silicon nitride-containing ceramic material comprising heating the product of claim 7 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
Claim 15
Dependent Claim
30 words
A process for preparing a silicon nitride-containing ceramic material comprising heating the product of claim 8 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
Claim 16
Dependent Claim
29 words
A process for preparing a silicon nitride-containing material comprising heating the product of claim 9 to a temperature of at least 800° C. in an inert or ammonia-containing atmosphere.
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) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |