US4312970A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silazane polymers from {R'3 Si}2 NH and organochlorosilanes
Assignee: Dow Silicones Corp
•
Filing: 1981-02-20
•
Granted: 1982-01-26
•
Expires: 2001-02-20
Abstract
Abstract What is disclosed is a process for preparing R'3SiNH- containing silazane polymers by contacting and reacting organochlorosilanes with {R'3Si}2NH 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
2026-10-24 01:16
CPC Classifications
C; C08; C08G; C08G18/00; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956; C01B32/963; C01B32/977; C08G77/00; C08G77/60; C08G77/62; C01P; C01P2002/00; C01P2002/80; C01P2002/88; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 85
Claim 1
Independent Claim
98 words
A process of preparing an R' 3 SiNH-- containing silazane polymer which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl; and n has a value of 1 or 2.
Claim 2
Dependent Claim
98 words
A process of preparing an R' 3 SiNH-- containing silazane polymer which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl; and n has a value of 1 or 2.
Claim 3
Dependent Claim
13 words
A process as claimed in claim 1 wherein the organochlorosilane is an alkylchlorosilane.
Claim 4
Dependent Claim
16 words
A process as claimed in claim 2 wherein the alkylchlorosilane is CH 3 SiCl 3 .
Claim 5
Dependent Claim
16 words
A process as claimed in claim 1 wherein the organochlorosilane is CH 2 ═CHSiCl 3 .
Claim 6
Dependent Claim
20 words
A process as claimed in claim 2 wherein the alkylchlorosilane is CH 3 (CH 2 ) 2 SiCl 3 .
Claim 7
Dependent Claim
18 words
A process as claimed in claim 2 wherein the alkylchlorosilane is CH 3 CH 2 SiCl 3 .
Claim 8
Dependent Claim
21 words
A process as claimed in claim 3 wherein (R' 3 Si) 2 NH is {(CH 3 ) 3 Si} 2 NH.
Claim 9
Dependent Claim
23 words
A process as claimed in claim 3 wherein (R' 3 Si) 2 NH is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 10
Dependent Claim
25 words
A process as claimed in claim 3 wherein (R' 3 Si) 2 NH is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 11
Dependent Claim
25 words
A process as claimed in claim 3 wherein (R' 3 Si) 2 NH is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 12
Dependent Claim
21 words
A process as claimed in claim 3 wherein (R' 3 Si) 2 NH is {H(CH 3 ) 2 Si} 2 NH.
Claim 13
Dependent Claim
21 words
A process as claimed in claim 4 wherein (R' 3 Si) 2 NH is {(CH 3 ) 3 Si} 2 NH.
Claim 14
Dependent Claim
23 words
A process as claimed in claim 4 wherein (R' 3 Si) 2 NH is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 15
Dependent Claim
25 words
A process as claimed in claim 4 wherein (R' 3 Si) 2 NH is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 16
Dependent Claim
25 words
A process as claimed in claim 4 wherein R' 3 Si) 2 NH is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 17
Dependent Claim
21 words
A process as claimed in claim 4 wherein (R' 3 Si) 2 NH is {H(CH 3 ) 2 Si} 2 NH.
Claim 18
Dependent Claim
21 words
A process as claimed in claim 5 wherein (R' 3 Si) 2 NH is {(CH 3 ) 3 Si} 2 NH.
Claim 19
Dependent Claim
23 words
A process as claimed in claim 5 wherein (R' 3 Si) 2 NH is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 20
Dependent Claim
25 words
A process as claimed in claim 5 wherein (R' 3 Si) 2 NH is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 21
Dependent Claim
25 words
A process as claimed in claim 5 wherein (R' 3 Si) 2 NH is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 22
Dependent Claim
21 words
A process as claimed in claim 5 wherein (R' 3 Si) 2 NH is {H(CH 3 ) 2 Si} 2 NH.
Claim 23
Dependent Claim
21 words
A process as claimed in claim 6 wherein (R' 3 Si) 2 NH is {(CH 3 ) 3 Si} 2 NH.
Claim 24
Dependent Claim
23 words
A process as claimed in claim 6 wherein (R' 3 Si) 2 NH is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 25
Dependent Claim
25 words
A process as claimed in claim 6 wherein (R' 3 Si) 2 NH is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 26
Dependent Claim
25 words
A process as claimed in claim 6 wherein (R' 3 Si) 2 NH is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 27
Dependent Claim
21 words
A process as claimed in claim 6 wherein (R' 3 Si) 2 NH is {H(CH 3 ) 2 Si} 2 NH.
Claim 28
Dependent Claim
18 words
A process as claimed in claim 1 wherein the organochlorosilane is C 6 H 5 SiCl 3 .
Claim 29
Dependent Claim
18 words
A process as claimed in claim 27 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 30
Dependent Claim
20 words
A process as claimed in claim 27 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 31
Dependent Claim
22 words
A process as claimed in claim 27 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 32
Dependent Claim
27 words
A process as claimed in claim 27 wherein the disilazane (R' 3 Si) 2 NH is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 33
Dependent Claim
23 words
A process as claimed in claim 27 wherein the disilazane (R' 3 Si) 2 NH is {H(CH 3 ) 2 Si} 2 NH.
Claim 34
Dependent Claim
25 words
A process as claimed in claim 1 wherein there is a mixture of organochlorosilanes and the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 35
Dependent Claim
27 words
A process as claimed in claim 1 wherein there is a mixture of organochlorosilanes and the disilazane is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 36
Dependent Claim
29 words
A process as claimed in claim 1 wherein there is a mixture of organochlorosilanes and the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 37
Dependent Claim
29 words
A process as claimed in claim 1 wherein there is a mixture of organochlorosilanes and the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 38
Dependent Claim
25 words
A process as claimed in claim 1 wherein there is a mixture of organochlorosilanes and the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 39
Dependent Claim
43 words
A process as defined in claim 1 wherein in the organochlorosilane or mixture of organochlorosilanes the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, and the temperature is in the range of 125° C. to 300° C.
Claim 40
Dependent Claim
14 words
An R' 3 SiNH-- containing silazane polymer prepared by the process of claim 1.
Claim 41
Dependent Claim
22 words
A composition as claimed in claim 39 wherein the organochlorosilane is an alkylchlorosilane and the disilazane is (R' 3 Si) 2 NH.
Claim 42
Dependent Claim
24 words
A composition as claimed in claim 40 wherein the alkylchlorosilane is CH 3 SiCl 3 and the disilazane is (R' 3 Si) 2 NH.
Claim 43
Dependent Claim
24 words
A composition as claimed in claim 39 wherein the organochlorosilane is CH 2 ═CHSiCl 3 and the disilazane is (R' 3 Si) 2 NH.
Claim 44
Dependent Claim
28 words
A composition as claimed in claim 40 wherein the alkylchlorosilane is CH 3 (CH 2 ) 2 SiCl 3 and the disilazane is (R' 3 Si) 2 NH.
Claim 45
Dependent Claim
26 words
A composition as claimed in claim 40 wherein the alkylchlorosilane is CH 3 CH 2 SiCl 3 and the disilazane is (R' 3 Si) 2 NH.
Claim 46
Dependent Claim
18 words
A composition as claimed in claim 41 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 47
Dependent Claim
18 words
A composition as claimed in claim 41 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi}NH.
Claim 48
Dependent Claim
22 words
A composition as claimed in claim 41 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 49
Dependent Claim
22 words
A composition as claimed in claim 41 wherein the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 50
Dependent Claim
18 words
A composition as claimed in claim 41 wherein the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 51
Dependent Claim
18 words
A composition as claimed in claim 42 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 52
Dependent Claim
18 words
A composition as claimed in claim 42 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi}NH.
Claim 53
Dependent Claim
22 words
A composition as claimed in claim 42 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 54
Dependent Claim
22 words
A composition as claimed in claim 42 wherein the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 55
Dependent Claim
18 words
A composition as claimed in claim 42 wherein the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 56
Dependent Claim
18 words
A composition as claimed in claim 43 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 57
Dependent Claim
18 words
A composition as claimed in claim 43 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi}NH.
Claim 58
Dependent Claim
22 words
A composition as claimed in claim 43 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 59
Dependent Claim
22 words
A composition as claimed in claim 43 wherein the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 60
Dependent Claim
18 words
A composition as claimed in claim 43 wherein the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 61
Dependent Claim
18 words
A composition as claimed in claim 44 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 62
Dependent Claim
18 words
A composition as claimed in claim 44 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi}NH.
Claim 63
Dependent Claim
22 words
A composition as claimed in claim 44 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 64
Dependent Claim
22 words
A composition as claimed in claim 44 wherein the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 65
Dependent Claim
18 words
A composition as claimed in claim 44 wherein the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 66
Dependent Claim
26 words
A composition as claimed in claim 39 wherein the organochlorosilane is C 6 H 5 SiCl 3 and the disilazane is {R' 3 Si} 2 NH.
Claim 67
Dependent Claim
18 words
A composition as claimed in claim 65 wherein the disilazane is {(CH 3 ) 3 Si} 2 NH.
Claim 68
Dependent Claim
20 words
A composition as claimed in claim 65 wherein the disilazane is {(CH 3 ) 2 CH 2 ═CHSi} 2 NH.
Claim 69
Dependent Claim
22 words
A composition as claimed in claim 65 wherein the disilazane is {CH 3 (C 6 H 5 ) 2 Si} 2 NH.
Claim 70
Dependent Claim
22 words
A composition as claimed in claim 65 wherein the disilazane is {C 6 H 5 (CH 3 ) 2 Si} 2 NH.
Claim 71
Dependent Claim
18 words
A composition as claimed in claim 65 wherein the disilazane is {H(CH 3 ) 2 Si} 2 NH.
Claim 72
Dependent Claim
122 words
A composition of matter as claimed in claim 39 which is an R' 3 SiNH-- containing silazane polymer which is prepared by contacting and reacting in an inert, essentially anhydrous, atmosphere, an organochlorosilane or a mixture of organochlorosilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, of the general formula R.sub.n SiCl.sub.4-n 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 phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl; and n has a value of 1 or 2.
Claim 73
Independent Claim
138 words
A method for preparing a silicon carbide-containing ceramic material which consists of heating a 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, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl; and n has a value of 1 or 2.
Claim 74
Independent Claim
138 words
A method for preparing a silicon carbide-containing ceramic material which consists of heating a 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, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl; and n has a value of 1 or 2.
Claim 75
Dependent Claim
9 words
The material prepared by the method of claim 72.
Claim 76
Independent Claim
169 words
A method of preparing a silicon carbide-containing ceramic article which consists of (A) forming an article of the desired shape from a 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, an organochlorosilane or a mixture of organochlorosilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, of the general formula R.sub.n SiCl.sub.4-n 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 phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl and n has a value of 1 or 2.
Claim 77
Independent Claim
169 words
A method of preparing a silicon carbide-containing ceramic article which consists of (A) forming an article of the desired shape from a 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, an organochlorosilane or a mixture of organochlorosilanes, wherein the number of diorgano-substituted silicon atoms does not exceed the number of monoorgano-substituted silicon atoms, of the general formula R.sub.n SiCl.sub.4-n 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 phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl and n has a value of 1 or 2.
Claim 78
Dependent Claim
9 words
The article prepared by the method in claim 74.
Claim 79
Dependent Claim
27 words
The method of claim 74 wherein at least one conventional ceramic filler is mixed with the silazane polymer prior to forming an article of the desired shape.
Claim 80
Dependent Claim
10 words
The filled article prepared by the method of claim 76.
Claim 81
Independent Claim
158 words
A method of preparing an article coated with ceramic which consists of (A) coating a substrate with a silazane polymer which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl and n has a value of 1 or 2 and (B) 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.
Claim 82
Independent Claim
158 words
A method of preparing an article coated with ceramic which consists of (A) coating a substrate with a silazane polymer which silazane polymer is obtained by a process which consists of contacting and reacting in an inert, essentially anhydrous, atmosphere, an organochlorosilane or a mixture of organochlorosilanes of the general formula R.sub.n SiCl.sub.4-n with a disilazane having the general formula (R'.sub.3 Si).sub.2 NH at a temperature in the range of 25° C. to 300° C. while distilling by-produced volatile products, wherein R is vinyl, an alkyl group of 1-3 carbon atoms or phenyl; R' is vinyl, hydrogen, an alkyl group of 1-3 carbon atoms or phenyl and n has a value of 1 or 2 and (B) 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.
Claim 83
Dependent Claim
23 words
The method of claim 78 wherein at least one conventional ceramic filler is mixed with the silazane polymer prior to coating the substrate.
Claim 84
Dependent Claim
10 words
The coated article prepared by the method of claim 78.
Claim 85
Dependent Claim
10 words
The coated article prepared by the method of claim 79.
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) | 1985-01-25 | 1985-07-27 | 1986-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-25 | 1989-07-27 | 1990-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-25 | 1993-07-27 | 1994-01-26 | $7700.00 | Window Closed / Lapsed |