Patent US4404153A successfully refreshed from Google Patents.
US4404153A
Expired / Lapsed
US
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Process for the preparation of poly(disilyl)silazane polymers and the polymers therefrom
Assignee: Dow Silicones Corp
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Filing: 1981-08-10
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Granted: 1983-09-13
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Expires: 2001-08-10
Abstract
Abstract What is disclosed is a process for preparing R' 3 SiNH-containing silazane polymers by contacting and reacting chlorine-containing disilanes with {R' 3 Si} 2 NH where R' is vinyl, hydrogen, an alkyl radical of 1-3 carbon atoms or the phenyl group. The silazane polymers are useful as chemical intermediates to produce silicon-containing chemical compounds. They are also useful in the formation of silicon carbide-containing ceramic materials.
Inventors
- 👤 John H. Gaul, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:00
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/977; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C08; C08G; C08G77/00; C08G77/60; C08G77/62; C08L; C08L83/00; C08L83/16; C01P; C01P2002/00; C01P2002/02; C01P2002/60; C01P2002/80; C01P2002/88; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/64; C01P2006/00; C01P2006/80; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
An article prepared by a method which consists of (A) mixing at least one conventional ceramic filler with an R' 3 SiNH--containing silazane polymer, (B) coating a substrate with the filled R' 3 SiNH--containing silazane polymer, (C) heating the coated substrate in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the coating is converted to a silicon carbide ceramic material, whereby a silicon carbide-containing ceramic coated article is obtained, which silazane polymer is obtained by a process which consists of contracting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 2
Dependent Claim
208 words
An article prepared by a method which consists of (A) mixing at least one conventional ceramic filler with an R' 3 SiNH--containing silazane polymer, (B) coating a substrate with the filled R' 3 SiNH--containing silazane polymer, (C) heating the coated substrate in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the coating is converted to a silicon carbide ceramic material, whereby a silicon carbide-containing ceramic coated article is obtained, which silazane polymer is obtained by a process which consists of contracting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 3
Dependent Claim
176 words
A silicon carbide ceramic material prepared by a method which consists of heating an R' 3 SiNH--containing silazane polymer in an inert atmosphere or in a vacuum to at least a temperature of 750° C. until the silazane polymer is converted to silicon carbide ceramic material, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 4
Dependent Claim
176 words
A silicon carbide ceramic material prepared by a method which consists of heating an R' 3 SiNH--containing silazane polymer in an inert atmosphere or in a vacuum to at least a temperature of 750° C. until the silazane polymer is converted to silicon carbide ceramic material, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 5
Dependent Claim
193 words
A silicon carbide containing ceramic article prepared by a method which consists of (A) forming an article of the desired shape from an R' 3 SiNH--containing silazane polymer; (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the silazane polymer is converted to silicon carbide containing ceramic, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 6
Dependent Claim
193 words
A silicon carbide containing ceramic article prepared by a method which consists of (A) forming an article of the desired shape from an R' 3 SiNH--containing silazane polymer; (B) heating the article formed in (A) in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the silazane polymer is converted to silicon carbide containing ceramic, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 7
Dependent Claim
209 words
A silicon carbide containing ceramic article prepared by a method which consists of (A) adding and mixing a conventional ceramic filler with an R' 3 SiNH--containing silazane polymer; (B) forming an article of the desired shape from the filled R' 3 SiNH--containing silazane polymer; (C) heating the article formed in (B) in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the silazane polymer is converted to silicon carbide containing ceramic, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
Claim 8
Dependent Claim
209 words
A silicon carbide containing ceramic article prepared by a method which consists of (A) adding and mixing a conventional ceramic filler with an R' 3 SiNH--containing silazane polymer; (B) forming an article of the desired shape from the filled R' 3 SiNH--containing silazane polymer; (C) heating the article formed in (B) in an inert atmosphere or in a vacuum to an elevated temperature of at least 750° C. until the silazane polymer is converted to silicon carbide containing ceramic, which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, a chlorine-containing disilane or a mixture of chlorine-containing disilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monorgano-substituted silicon atoms, of the general formula (Cl.sub.a R.sub.b Si).sub.2 with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 125° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or the phenyl group; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or the phenyl group; a has a value of 0.5-3; b has a value of 0-2.5 and the sum of a+b is equal to three.
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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) | 1986-09-12 | 1987-03-14 | 1987-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-12 | 1991-03-14 | 1991-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-12 | 1995-03-14 | 1995-09-13 | $7700.00 | Window Closed / Lapsed |