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US4972029A
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Process for preparing thermally stable crosslinked epoxy resins
Assignee: Wacker Chemie AG
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Filing: 1989-03-20
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Granted: 1990-11-20
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Expires: 2009-03-20
Abstract
Abstract Thermally stable, crosslinked epoxy resins are obtained by crosslinking an epoxy resin with a silicon compound containing a basic nitrogen which is bonded to silicon via carbon and to which at least 1 hydrogen atom is bonded directly to the nitrogen atom, and thereafter conditioning the crosslinked epoxy resin.
Inventors
- 👤 Christian Herzig
- 👤 Bernward Deubzer
- 👤 Josef Esterbauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:47
CPC Classifications
C; C08; C08G; C08G59/00; C08G59/18; C08G59/40; C08G59/50; C08G59/504; C08G59/4007; C08G59/4085; C08L; C08L83/00; C08L83/04; C08L83/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
67 words
A process for preparing thermally stable, crosslinked epoxy resins which comprises crosslinking an epoxy resin with a silicon compound having a basic nitrogen which is bonded to silicon via carbon and to which at least 1 hydrogen atom is bonded directly to the nitrogen atom and thereafter conditioning the crosslinked epoxy resin at a temperature of from 150° C. to 250° C. for at least 2 hours.
Claim 2
Dependent Claim
67 words
A process for preparing thermally stable, crosslinked epoxy resins which comprises crosslinking an epoxy resin with a silicon compound having a basic nitrogen which is bonded to silicon via carbon and to which at least 1 hydrogen atom is bonded directly to the nitrogen atom and thereafter conditioning the crosslinked epoxy resin at a temperature of from 150° C. to 250° C. for at least 2 hours.
Claim 3
Dependent Claim
27 words
The process of claim 1, wherein at least part of the epoxy resin to be crosslinked comprises a product obtained from the reaction of 2,2-bis-(4-hydroxyphenyl)-propane and epichlorohydrin.
Claim 4
Dependent Claim
105 words
The process of claim 1, wherein the silicon compound is an organopolysiloxane having units of the formula ##STR6## in which R is a monovalent hydrocarbon radical having from 1 to 8 carbon atoms per radical, R 1 is an alkyl group having from 1 to 4 carbon atoms per radical and Y is a monovalent SiC-bonded organic radical having a basic nitrogen to which at least 1 hydrogen atom is bonded directly to the nitrogen atom, and a is an average of from 0.2 to 1.0, b is an average of from 0.0 to 2.0, and c is an average of from 0.0 to 2.0.
Claim 5
Dependent Claim
105 words
The process of claim 2, wherein the silicon compound is an organopolysiloxane having units of the formula ##STR7## in which R is a monovalent hydrocarbon radical having from 1 to 8 carbon atoms per radical, R 1 is an alkyl group having from 1 to 4 carbon atoms per radical and Y is a monovalent SiC-bonded organic radical having a basic nitrogen to which at least 1 hydrogen atom is bonded directly to the nitrogen atom, and a is an average of from 0.02 to 1.0, b is an average of from 0.0 to 2.0, and c is an average of from 0.0 to 2.0.
References Cited (Backward Citations)
US4287326A
Cited
US4413104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |