US4496679A
Expired / Lapsed
US
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Stabilization of polyphenylene ether solutions
Assignee: BASF SE
•
Filing: 1983-09-13
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Granted: 1985-01-29
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Expires: 2003-09-13
Abstract
Abstract A process for the preparation of high molecular weight polyphenylene ethers from alkyl-substituted monohydric phenols by an oxidative coupling reaction with oxygen in the presence of a catalyst complex of a copper salt and an organic amine, subsequent stopping of the reaction and removal of the metal component of the catalyst by addition of chelating and/or salt-forming agents, wherein the polymer solution is treated with a compound having the general structure: ##STR1## where R 2 and R 3 can be identical or different and each is OH, NH 2 , NHR 5 , where R 5 is alkyl or cycloalkyl, or SH, and where R 1 and R 4 are identical or different, being hydrogen, alkyl, cycloalkyl, aryl, carbonyl, carboxyl, carboxyalkyl or nitrile, and can be linked to form a ring, advantageously in an amount of from 0.1 to 100 mmoles and advantageously in from 1 to 20% strength aqueous solutions.
Inventors
- 👤 Juergen Hambrecht
- 👤 Rudi W. Reffert
- 👤 Adolf Echte
- 👤 Johann Swoboda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:17
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
185 words
A process for the stabilization of solutions of high molecular weight polyphenylene ethers, which solutions are formed by conducting an oxidative coupling reaction of oxygen and a monohydric phenol at a temperature of from 15° to 50° C. in the presence of a catalyst complex of a copper salt and an organic amine in the presence of a solvent in a weight ratio of from 1:1 to 20:1, based on the monomeric phenol, said monohydric phenol having alkyl substituents in the two ortho-positions and optionally in the meta-positions but not in the para-position, which stabilization process comprises: contacting the formed reaction solution containing the high molecular weight polyphenylene ethers with from 0.1 to 100 mmoles per mole of monomeric phenol of a compound of the structure ##STR9## where R 2 and R 3 can be identical or different and each is OH, NH 2 , NHR 5 , where R 5 is alkyl or cycloalkyl, or SH, and R 1 and R 2 are identical or different, being hydrogen, alkyl, cycloalkyl, aryl, carbonyl, carboxyl, carboxyalkyl or nitrile, and can be linked to form a ring.
Claim 2
Dependent Claim
185 words
A process for the stabilization of solutions of high molecular weight polyphenylene ethers, which solutions are formed by conducting an oxidative coupling reaction of oxygen and a monohydric phenol at a temperature of from 15° to 50° C. in the presence of a catalyst complex of a copper salt and an organic amine in the presence of a solvent in a weight ratio of from 1:1 to 20:1, based on the monomeric phenol, said monohydric phenol having alkyl substituents in the two ortho-positions and optionally in the meta-positions but not in the para-position, which stabilization process comprises: contacting the formed reaction solution containing the high molecular weight polyphenylene ethers with from 0.1 to 100 mmoles per mole of monomeric phenol of a compound of the structure ##STR9## where R 2 and R 3 can be identical or different and each is OH, NH 2 , NHR 5 , where R 5 is alkyl or cycloalkyl, or SH, and R 1 and R 2 are identical or different, being hydrogen, alkyl, cycloalkyl, aryl, carbonyl, carboxyl, carboxyalkyl or nitrile, and can be linked to form a ring.
Claim 3
Dependent Claim
25 words
The process of claim 1, wherein a from 1 to 20% strength by weight aqueous solution of the compound of the structure (I) is used.
Claim 4
Dependent Claim
27 words
The process of claim 1, wherein the polymer solution is contacted with the compound of the structure I at a temperature of from 25° to 90° C.
Claim 5
Dependent Claim
33 words
The process of claim 3, wherein the metal component of the catalyst is converted into a metal complex or salt when the polymer solution is contacted with a compound of the structure I.
Claim 6
Dependent Claim
15 words
The process of claim 1, wherein the compound of the formula I is ascorbic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |