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Patent US4952670A successfully refreshed from Google Patents.
US4952670A
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Polymeric hydridothiosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof
Assignee: Hoechst AG
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Filing: 1988-12-22
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Granted: 1990-08-28
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Expires: 2008-12-22
Abstract
Abstract Polymeric hydridothiosilazanes, processes for the preparation thereof, silicon nitride-containing ceramic materials which can be prepared therefrom, and the preparation thereof. The invention relates to novel polymeric hydridothiosilazanes, the preparation thereof, the conversion thereof into silicon nitride-containing ceramic material, and this material itself. To prepare the polymeric hydridothiosilazanes, oligohydridoalkylsilazanes (RSiHNH) n are reacted with elemental sulfur and ether as solvents. The polymeric hydridothiosilazanes can then be pyrolyzed to form silicon nitride-containing ceramic material.
Inventors
- 👤 Tilo Vaahs
- 👤 Hans-Jerg Kleiner
- 👤 Marcellus Peuckert
- 👤 Martin Bruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:57
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/60; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A process for the preparation of a polymeric hydridothiosilazane, which comprises reacting an oligohydridoalkylsilazane of the formula (RSiHNH) n in which n is approximately 3 to 12 and R is C 1 -C 6 -alkyl or C 2 -C 6 alkenyl, with elemental sulfur in an ether as solvent at 30° to 120° C.
Claim 2
Dependent Claim
54 words
A process for the preparation of a polymeric hydridothiosilazane, which comprises reacting an oligohydridoalkylsilazane of the formula (RSiHNH) n in which n is approximately 3 to 12 and R is C 1 -C 6 -alkyl or C 2 -C 6 alkenyl, with elemental sulfur in an ether as solvent at 30° to 120° C.
Claim 3
Dependent Claim
53 words
A process for the preparation of a polymeric hydridothiosilazane, which comprises reacting an oligohydridoalkylsilazane obtained by reacting a dichlorohydridoalkylsilane RSiHCl 2 with NH 3 , with elemental sulfur in an ether as a solvent at 30° to 120° C., where R is C 1 -C 6 -alkyl or C 2 -C 6 -alkenyl.
Claim 4
Dependent Claim
53 words
A process for the preparation of a polymeric hydridothiosilazane, which comprises reacting an oligohydridoalkylsilazane obtained by reacting a dichlorohydridoalkylsilane RSiHCl 2 with NH 3 , with elemental sulfur in an ether as a solvent at 30° to 120° C., where R is C 1 -C 6 -alkyl or C 2 -C 6 -alkenyl.
Claim 5
Dependent Claim
15 words
The process as claimed in claim 1 or 2, wherein R is methyl or vinyl.
Claim 6
Dependent Claim
24 words
The process as claimed in claim 1, wherein the molar ratio between sulfur and an RSiHNH unit of the oligohydridoalkylsilazane is 0.1:1 to 1:1.
Claim 7
Dependent Claim
36 words
A polymeric hydriodothiosilazane of the formula ##STR4## where R is C 1 -C 6 -alkyl or C 2 -C 6 -alkenyl and x and y denote the molar fractions of the two structural, and x+y=1 units.
Claim 8
Dependent Claim
36 words
A polymeric hydriodothiosilazane of the formula ##STR4## where R is C 1 -C 6 -alkyl or C 2 -C 6 -alkenyl and x and y denote the molar fractions of the two structural, and x+y=1 units.
Claim 9
Dependent Claim
14 words
A polymeric hydriodothiosilazane as claimed in claim 5, wherein y is 0.6 to 0.8.
Claim 10
Dependent Claim
14 words
A polymeric hydriodothiosilazane as claimed in claim 5, wherein R is methyl or vinyl.
Claim 11
Dependent Claim
12 words
A polymeric hydridothiosilazane obtainable by the process as claimed in claim 1.
References Cited (Backward Citations)
US4397828A
Cited
US4540803A
Cited
US4543344A
Cited
US4482669A
Cited
US4595775A
Cited
US4722988A
Cited
US4818611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |