US5008423A
Expired / Lapsed
US
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Polymeric hydridochlorosilazanes and processes for their preparation
Assignee: Hoechst AG
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Filing: 1988-09-22
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Granted: 1991-04-16
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Expires: 2008-09-22
Abstract
Abstract The invention relates to novel polymeric hydridochlorosilazanes and a process for their preparation. The compounds according to the invention can be converted into polyhydridosilaznes by reaction with ammonia, and these can in turn be pyrolyzed to ceramic material containing silicon nitride. To prepare the polymeric hydridochlorosilazanes, oligohydridoalkylsilazanes (R 1 SiHNH) n are reacted with a dichlorohydridoalkylsilane R 2 SiHCl 2 .
Inventors
- 👤 Thomas Gerdau
- 👤 Hans-Jerg Kleiner
- 👤 Marcellus Peuckert
- 👤 Martin Bruck
- 👤 Fritz Aldinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:06
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; 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
72 words
A process for the preparation of a polymeric hydridochlorosilazane, which comprises reacting an oligohydridoalkylsilazane of the formula (R 1 SiHNH) n , in which n is 3 to 12 and R 1 denotes an alkyl group with 1 to 6 carbon atoms, with a dichlorohydridoalkylsilane of the formula R 2 SiHCL 2 , in which R 2 denotes an alkyl group having 1 to 6 carbon atoms, at 30° to 300° C.
Claim 2
Dependent Claim
72 words
A process for the preparation of a polymeric hydridochlorosilazane, which comprises reacting an oligohydridoalkylsilazane of the formula (R 1 SiHNH) n , in which n is 3 to 12 and R 1 denotes an alkyl group with 1 to 6 carbon atoms, with a dichlorohydridoalkylsilane of the formula R 2 SiHCL 2 , in which R 2 denotes an alkyl group having 1 to 6 carbon atoms, at 30° to 300° C.
Claim 3
Dependent Claim
58 words
A process for the preparation of a polymeric hydridochlorosilazane, which comprises reacting an oligohydridoalkylsilazane which has been obtained by reacting a dichlorohydridoalkylsilane R 1 SiHCL 2 with NH 3 with a dichlorohydridoalkylsilane of the formula R 2 SiHCL 2 at 30° to 300° C., R 1 and R 2 denoting alkyl groups having 1 to 6 carbon atoms.
Claim 4
Dependent Claim
58 words
A process for the preparation of a polymeric hydridochlorosilazane, which comprises reacting an oligohydridoalkylsilazane which has been obtained by reacting a dichlorohydridoalkylsilane R 1 SiHCL 2 with NH 3 with a dichlorohydridoalkylsilane of the formula R 2 SiHCL 2 at 30° to 300° C., R 1 and R 2 denoting alkyl groups having 1 to 6 carbon atoms.
Claim 5
Dependent Claim
22 words
The process as claimed in claim 1, wherein R 1 and R 2 denote alkyl groups having 1 to 3 carbon atoms.
Claim 6
Dependent Claim
15 words
The process as claimed in claim 1, wherein R 1 =R 2 =CH 3 .
Claim 7
Dependent Claim
34 words
The process as claimed in claim 1, wherein the molar ratio of dichlorohydridoalkylsilane R 2 SiHCL 2 to an R 1 SiHNH unit of the oligohydridoalkylsilazane is 0.2 : 1 to 1.5 : 1.
Claim 8
Dependent Claim
34 words
The process as claimed in claim 1, wherein a temperature of 30° to 50° C. is maintained when the reactants are brought together and the mixture is then heated to 100° to 300° C.
Claim 9
Dependent Claim
66 words
A polymeric hydridochlorosilazane of the formula ##STR3## in which the free valencies of the nitrogen atoms are saturated with H atoms or silyl radicals R*SiXN<(X=H,Cl or N<) and in which R, R', R" and R* denote alkyl groups having 1 to 6 carbon atoms and a, b and c have values ranging from 0.1 to 0.8 and denote the molar fractions of the particular structural units.
Claim 10
Dependent Claim
66 words
A polymeric hydridochlorosilazane of the formula ##STR3## in which the free valencies of the nitrogen atoms are saturated with H atoms or silyl radicals R*SiXN<(X=H,Cl or N<) and in which R, R', R" and R* denote alkyl groups having 1 to 6 carbon atoms and a, b and c have values ranging from 0.1 to 0.8 and denote the molar fractions of the particular structural units.
Claim 11
Dependent Claim
23 words
A polymeric hydridochlorosilazane as claimed in claim 7, wherein R, R', R" and R* are alkyl groups having 1 to 3 carbon atoms.
Claim 12
Dependent Claim
14 words
A polymeric hydridochlorosilazane as claimed in claim 7, wherein R =R'=R"=R* =CH 3 .
Claim 13
Dependent Claim
12 words
A polymeric hydridochlorosilazane obtainable by the process as claimed in claim 1.
Claim 14
Dependent Claim
12 words
A polymeric hydridochlorosilazane obtainable by the process as claimed in claim 2.
Claim 15
Dependent Claim
12 words
A polymeric hydridochlorosilazane obtainable by the process as claimed in claim 3.
Claim 16
Dependent Claim
12 words
A polymeric hydridochlorosilazane obtainable by the process as claimed in claim 4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |