Patent US5045399A successfully refreshed from Google Patents.
US5045399A
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Organoborosilazane polymers
Assignee: Albemarle Corp
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Filing: 1988-09-09
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Granted: 1991-09-03
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Expires: 2008-09-09
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 trialkyl- or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a poly-silazane to form an organoborosilazane polymer.
Inventors
- 👤 Leonard M. Niebylski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5062; C04B41/507; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C08; C08G; C08G77/00; C08G77/60; C08G79/00; C08G79/08; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
38 words
A process which comprises reacting about 0.25-20 parts by weight of a trialkylboroxine or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane to form an organoborosilazane polymer.
Claim 2
Dependent Claim
38 words
A process which comprises reacting about 0.25-20 parts by weight of a trialkylboroxine or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane to form an organoborosilazane polymer.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the boroxine is a trialkoxyboroxine.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein the boroxine is trimethoxyboroxine.
Claim 5
Dependent Claim
60 words
The process of claim 1 wherein the polysilazane is a polymer prepared by reacting an organodihalosilane with ammonia to form an ammonolysis product, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group to form said polysilazane, and quenching the resultant polysilazane with an electrophilic quenching reagent.
Claim 6
Dependent Claim
22 words
The process of claim 4 wherein the organodihalosilane is methyldichlorosilane, the basic catalyst is potassium hydride, and the quenching reagent is dimethylchlorosilane.
Claim 7
Dependent Claim
24 words
The process of claim 1 wherein the polysilazane is a product prepared by reacting an organodihalosilane with ammonia and isolating the resultant ammonolysis product.
Claim 8
Dependent Claim
10 words
The process of claim 6 wherein the organodihalosilane is methyldichlorosilane.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein the boroxine/polysilazane weight ratio is about 1/1 to about 6/1.
Claim 10
Dependent Claim
16 words
The process of claim 8 wherein the boroxine/polysilazane weight ratio is about 3/1 to about 4/1.
Claim 11
Dependent Claim
25 words
The process of claim 1 wherein the reactants are mixed and reacted by adding a solution of the boroxine to a solution of the polysilazane.
Claim 12
Dependent Claim
47 words
The process of claim 1 wherein about 3-4 parts by weight of trimethoxyboroxine are mixed and allowed to react with one part by weight of a polysilazane prepared by reacting methyldichlorosilane with ammonia, treating the ammonolysis product with potassium hydride, and quenching the resultant product with dimethylchlorosilane.
Claim 13
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 1.
Claim 14
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 2.
Claim 15
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 3.
Claim 16
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 4.
Claim 17
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 5.
Claim 18
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 6.
Claim 19
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 7.
Claim 20
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 8.
Claim 21
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 9.
Claim 22
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 10.
Claim 23
Dependent Claim
10 words
An organoborosilazane polymer prepared by the process of claim 11.
Claim 24
Dependent Claim
58 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 trialkylboroxine or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane.
Claim 25
Dependent Claim
58 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 trialkylboroxine or trialkoxyboroxine in which the alkyl or alkoxy groups contain 1-6 carbons with one part by weight of a polysilazane.
Claim 26
Dependent Claim
49 words
The composition of claim 23 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 1-6 parts by weight of a trialkoxyboroxine with one part by weight of a polysilazane.
Claim 27
Dependent Claim
30 words
The composition of claim 24 wherein the polymer is the product obtained by reacting about 3-4 parts by weight of the trialkoxyboroxine with one part by weight of the polysilazane.
Claim 28
Dependent Claim
10 words
The composition of claim 25 wherein the trialkoxyboroxine is trimethoxyboroxine.
Claim 29
Dependent Claim
60 words
The composition of claim 25 wherein the polysilazane is a polymer prepared by reacting an organodihalosilane with ammonia to form an ammonolysis product, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group to form said polysilazane, and quenching the resultant polysilazane with an electrophilic quenching reagent.
Claim 30
Dependent Claim
22 words
The composition of claim 27 wherein the organodihalosilane is methyldichlorosilane, the basic catalyst is potassium hydride, and the quenching reagent is dimethylchlorosilane.
Claim 31
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 23.
Claim 32
Dependent Claim
9 words
A ceramic derived from the organoborosilazane of claim 12.
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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) | 1994-09-02 | 1995-03-04 | 1995-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-09-02 | 1999-03-04 | 1999-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-09-02 | 2003-03-04 | 2003-09-03 | $7700.00 | Window Closed / Lapsed |