US4921925A
Expired / Lapsed
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Organoborosilazane polymers
Assignee: Ethyl Corp
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Filing: 1988-11-17
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Granted: 1990-05-01
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Expires: 2008-11-17
Abstract
Abstract Preceramic polymers which have particular utility in providing protective ceramic coatings on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials, are prepared by reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane to form a organoborosilazane polymer.
Inventors
- 👤 Leonard M. Niebylski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:33
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/507; C08; C08G; C08G77/00; C08G77/60; C08G79/00; C08G79/08
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
26 words
A process which comprises reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane to form an organoborosilazane polymer.
Claim 2
Dependent Claim
26 words
A process which comprises reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane to form an organoborosilazane polymer.
Claim 3
Dependent Claim
37 words
The process of claim 1 wherein the boroxine is a compound corresponding to the formula: ##STR2## in which R is a phenoxy, alkylphenoxy, phenalkoxy, or alkylphenalkoxy substituent in which any alkyl or alkoxy group contains 1-6 carbons.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein the boroxine is triphenoxyboroxine.
Claim 5
Dependent Claim
51 words
The process of claim 1 wherein the polysilazane is a polymer prepared by reacting an organodihalosilane with ammonia, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group, and quenching the resultant product with an electrophilic quenching reagent.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein the organodihalosilane is methyldichlorosilane and the basic catalyst is potassium hydride.
Claim 7
Dependent Claim
13 words
The process of claim 1 wherein the boroxine/polysilazane weight ratio is about 1-10/1.
Claim 8
Dependent Claim
13 words
The process of claim 6 wherein the boroxine/polysilazane weight ratio is about 6-8/1.
Claim 9
Dependent Claim
21 words
The process of claim 1 wherein the reactants are mixed by adding a solution of the boroxine to a polysilazane solution.
Claim 10
Dependent Claim
56 words
The process of claim 1 wherein about 6-8 parts by weight of triphenoxyboroxine are reacted with an organic solvent solution of one part by weight of a polysilazane; the polysilazane being a polymer prepared by reacting methyldichlorosilane with ammonia, treating the ammonolysis product with potassium hydride, and quenching the resultant product with an electrophilic quenching reagent.
Claim 11
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 1.
Claim 12
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 2.
Claim 13
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 3.
Claim 14
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 4.
Claim 15
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 5.
Claim 16
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 6.
Claim 17
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 7.
Claim 18
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 8.
Claim 19
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 9.
Claim 20
Dependent Claim
46 words
A composition which comprises a solution of 5-75% by weight of an organoborosilazane polymer in 95-25% by weight of an organic solvent; the polymer being the product obtained by reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane.
Claim 21
Dependent Claim
46 words
A composition which comprises a solution of 5-75% by weight of an organoborosilazane polymer in 95-25% by weight of an organic solvent; the polymer being the product obtained by reacting about 0.25-20 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane.
Claim 22
Dependent Claim
49 words
The composition of claim 19 which comprises a solution of 40-60% by weight of an organoborosilazane polymer in 60-40% by weight of an organic solvent; the polymer being the product obtained by reacting about 6-8 parts by weight of a triaryloxyboroxine with one part by weight of a polysilazane.
Claim 23
Dependent Claim
10 words
The composition of claim 20 wherein the triaryloxyboroxine is triphenoxyboroxine.
Claim 24
Dependent Claim
51 words
The composition of claim 20 wherein the polysilazane is a polymer prepared by reacting an organodihalosilane with ammonia, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group, and quenching the resultant product with an electrophilic quenching reagent.
Claim 25
Dependent Claim
17 words
The composition of claim 22 wherein the organodihalosilane is methyldichlorosilane and the basic catalyst is potassium hydride.
Claim 26
Dependent Claim
23 words
An article which comprises a substrate that is normally susceptible to oxidative deterioration and a coating derived from the composition of claim 19.
Claim 27
Dependent Claim
9 words
A ceramic derived from the organoborosilazane of claim 10.
References Cited (Backward Citations)
US4397828A
Cited
US4482669A
Cited
US4482689A
Cited
US4645807A
Cited
US4650837A
Cited
US4659850A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-04-30 | 1993-10-30 | 1994-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-30 | 1997-10-30 | 1998-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-30 | 2001-10-30 | 2002-05-01 | $7700.00 | Window Closed / Lapsed |