US4722988A
Expired / Lapsed
US
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Organopolysilazane composition containing free radical generators and capable of being crosslinked by an energy input
Assignee: Rhone Poulenc Specialites Chimiques
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Filing: 1986-05-06
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Granted: 1988-02-02
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Expires: 2006-05-06
Abstract
Abstract An organopolysilazane composition that can be crosslinked by an energy input. The organopolysilazane composition comprises an organopolysilazane and a free radical generator in an amount effective to crosslink the organopolysilazane. The energy input capable of generating the radical may be provided in the form of heat, ultraviolet radiation, an electron beam, and the like. The crosslinked organopolysilazane compositions exhibit good thermal behavior and, in particular, can be used, after pyrolysis, as precursors of ceramic products.
Inventors
- 👤 Hugues Porte
- 👤 Jean-Jacques Lebrun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:04
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B41/45; C04B41/50; C04B41/5025; C04B41/5035; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C08; C08G; C08G77/00; C08G77/60; C08G77/62; C08L; C08L83/00; C08L83/16; G; G03; G03F; G03F7/00; G03F7/004; G03F7/075; G03F7/0757
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
33 words
An organopolysilazane composition that is capable of being crosslinked by an energy input comprising (a) an organopolysilazane, and (b) at least one free radical generator in an amount effective to crosslink the organopolysilazane.
Claim 2
Dependent Claim
33 words
An organopolysilazane composition that is capable of being crosslinked by an energy input comprising (a) an organopolysilazane, and (b) at least one free radical generator in an amount effective to crosslink the organopolysilazane.
Claim 3
Dependent Claim
31 words
The composition according to claim 1, wherein the organopolysilazane contains at least one SiR 1 group per molecule with R 1 being a hydrocarbon radical containing an unsaturated alkene or alkyne.
Claim 4
Dependent Claim
13 words
The composition according to claim 2, wherein R 1 is a vinyl radical.
Claim 5
Dependent Claim
15 words
The composition according to claim 1, wherein the free radical generator is an azo compound.
Claim 6
Dependent Claim
13 words
The composition according to claim 4, wherein the azo compound is 2,2'-azobis (isobutyronitrile).
Claim 7
Dependent Claim
22 words
The composition according to claim 4, wherein up to 200 g of the azo compound per kg of the organopolysilazane is present.
Claim 8
Dependent Claim
15 words
The composition according to claim 1, wherein the free radical generator is an organic peroxide.
Claim 9
Dependent Claim
10 words
The composition according to claim 1, further comprising a filler.
Claim 10
Dependent Claim
13 words
The composition of claim 1, wherein the organopolysilazane composition is substantially solvent free.
Claim 11
Dependent Claim
17 words
The composition of claim 1, wherein the free radical generator is an azonitrile containing tertiary amine groups.
Claim 12
Dependent Claim
27 words
The composition of claim 1, wherein the free radical generator is present in a concentration in the range of 0.1 g to 50 g per kg organopolysilazane.
Claim 13
Dependent Claim
31 words
The composition of claim 1, wherein the organopolysilazane is chosen so that the viscosity of the organopolysilazane composition at 25° C. from about 1 mPa s to about 5,000 mPa s.
Claim 14
Dependent Claim
39 words
A process for crosslinking an organopolysilazane composition containing an organopolysilazane and a free radical generator, comprising the step of exposing the organopolysilazane composition to an energy input in an amount effective to generate free radicals and crosslink the organopolysilazane.
Claim 15
Dependent Claim
39 words
A process for crosslinking an organopolysilazane composition containing an organopolysilazane and a free radical generator, comprising the step of exposing the organopolysilazane composition to an energy input in an amount effective to generate free radicals and crosslink the organopolysilazane.
Claim 16
Dependent Claim
22 words
The process according to claim 13, wherein said organopolysilazane composition is exposed to heating at a temperature from 40° to 400° C.
Claim 17
Dependent Claim
17 words
The process according to claim 14, wherein the temperature range is from 100° C. to 220° C.
References Cited (Backward Citations)
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| 3.5 Years (Year 4) | 1991-02-01 | 1991-08-03 | 1992-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-01 | 1995-08-03 | 1996-02-02 | $3760.00 | Window Closed / Lapsed |
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