EP0480225A1
Expired / Lapsed
EP
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Polymer precursors for aluminum nitride
Assignee: Lanxide Technology Co LP
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Filing: 1991-09-23
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Granted: —
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Expires: 2011-09-23
Abstract
Abstract An aluminum-nitrogen polymer is prepared by reacting an organic nitrile with a dialkylaluminum hydride to form an organoaluminum imine, and heating the imine to a temperature of 50 ° to 200 °C. The polymeric product can be subjected to an additional heat treatment to form a more highly cross-linked polymer. After either heat treatment the polymeric product can be further reacted with a primary amine or ammonia. The organoaluminum imine as well as the aminated or nonaminated polymers can be pyrolyzed in a nonoxidizing atmosphere to form an aluminum nitride-containing ceramic.
Inventors
- 👤 James Allen Jensen
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 01:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C01; C01B; C01B21/00; C01B21/06; C01B21/072; C08; C08G; C08G79/00; C08G79/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
121 words
Example 11 The polymer prepared as described in Example 1 (15.8 g) is further heated under nitrogen to a temperature of 250 ° C for 4 hours. The volatile products evolved during the heating are shown by gas chromatography to be 37% isobutane and 63% isobutene. The resulting polymer, isolated in 13.1 gram yield, is an extremely viscous liquid of viscosity greater than 750,000 cps (MPa) measured at 30°C. The pyrolysis yield as measured by thermogravimetric analysis (25°-600°C, 20°C/min., N 2 ) is 49.3%. The polymer is pyrolyzed by heating in nitrogen from room temperature to 1500°C at a rate of 10°C/min. and holding at 1500°C for two hours. The resulting ceramic is shown to be crystalline AIN by X-ray diffraction.
Claim 2
Dependent Claim
89 words
A process for preparing an aluminum-nitrogen polymer by reacting an organic nitrile with a dialkylaluminum hydride to form an organoaluminum imine and then heating the imine, characterized by (a) reacting an organic nitrile having the formula RCN, where R is a 1-12 carbon alkyl, cycloalkyl or aryl group, with a dialkylaluminum hydride having the formula R'R"AIH, wherein R' and R" are the same or different 1-12 carbon alkyl groups, to form an organoaluminum imine, and (b) heating the organoaluminum imine to a temperature of 50 ° to 200 °C.
Claim 3
Dependent Claim
24 words
The process of claim 1, further characterized by reacting the aluminum-nitrogen polymer with a 1-12 carbon alkyl, cycloalkyl or aryl primary amine or ammonia.
Claim 4
Dependent Claim
25 words
The process of claim 1, further characterized by heating the aluminum-nitrogen polymer to a temperature of 200 ° to 400 ° C after step (b).
Claim 5
Dependent Claim
32 words
The process of claim 3, further characterized by reacting the aluminum-nitrogen polymer with a 1-12 carbon alkyl, cycloalkyl or aryl primary amine or ammonia after heating at 200 ° to 400 C.
Claim 6
Dependent Claim
42 words
An aluminum-nitrogen polymer characterized by repeating units having the formula: and where R is a 1-12 carbon alkyl, cycloalkyl or aryl group, R 2 is a 1-12 carbon alkyl group, and R 3 is an organic group derived from R 2 .
Claim 7
Dependent Claim
85 words
Use of the polymer of claim 5 to prepare an aluminum-nitrogen polymer wherein at least some of the repeating units comprise the following: and where R is a 1-12 carbon alkyl, cycloalkyl or aryl group, R 2 and R 4 are 1-12 carbon alkyl groups, R 3 is an organic group derived from R 2 , and R 5 is H or R 4 , characterized by reacting the polymer of claim 5 with ammonia or a 1-12 carbon primary alkyl, cycloalkyl or aryl amine.
Claim 8
Dependent Claim
22 words
Use of the organoaluminum imine of claim 1 to prepare an AIN-containing ceramic, characterized by pyrolyzing the imine in a nonoxidizing atmosphere.
Claim 9
Dependent Claim
21 words
Use of the polymer of claim 5 to prepare an AIN-containing ceramic characterized by pyrolyzing the polymer in a nonoxidizing atmosphere.
Claim 10
Dependent Claim
36 words
Use of the polymer of claim 5 to prepare an AIN-containing ceramic characterized by reacting the polymer with ammonia or a 1-12 carbon primary alkyl, cycloalkyl or aryl amine and then pyrolyzing in a nonoxidizing atmosphere.
References Cited (Backward Citations)
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