Patent US3843604A successfully refreshed from Google Patents.
US3843604A
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Method of producing polyphenyleneoxides-1,4 in aliphatic nitrile solvents
Assignee: Individual
•
Filing: 1973-07-05
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Granted: 1974-10-22
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Expires: 1993-07-05
Abstract
Abstract A method of producing polyphenyleneoxides-1,4, residing in that single-ring aromatic monooxy-compounds are oxidized by oxygen in the medium of an organic solvent which is a nitrile of an aliphatic monocarboxylic acid or a nitrile of an aliphatic polybasic carboxylic acid with all the carboxylic groups substituted by nitrile groups, in the presence of a catalyst which is a cupramine complex formed by a copper salt and an amine.
Inventors
- 👤 V Kopylov
- 👤 V Cherednichenko
- 👤 A Pravednikov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:20
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
67 words
IN A METHOD OF PRODUCING POLYPHENYLENEOXIDES-1,4, COMPRISING OXIDIZING A SINGLE-RING AROMATIC MONOOXY-COMPOUND WITH OXYGEN IN AN ORGANIC SOLVENT IN THE PRESENCE OF A CUPRAMINE COMPLEX CATALYST FORMED FROM A COPPER SALT AND AN AMINE, AN IMPROVEMENT ACCORDING TO WHICH THE ORGANIC SOLVENT IS A NITRILE OF AN ALIPHATIC MONOCARBOXYLIC ACID OR OF AN ALIPHATIC POLYBASIC CARBOXYLIC ACID WHEREIN ALL THE CARBOXYLIC GROUPS ARE SUBSTITUTED BY NITRILE GROUPS.
Claim 2
Dependent Claim
67 words
IN A METHOD OF PRODUCING POLYPHENYLENEOXIDES-1,4, COMPRISING OXIDIZING A SINGLE-RING AROMATIC MONOOXY-COMPOUND WITH OXYGEN IN AN ORGANIC SOLVENT IN THE PRESENCE OF A CUPRAMINE COMPLEX CATALYST FORMED FROM A COPPER SALT AND AN AMINE, AN IMPROVEMENT ACCORDING TO WHICH THE ORGANIC SOLVENT IS A NITRILE OF AN ALIPHATIC MONOCARBOXYLIC ACID OR OF AN ALIPHATIC POLYBASIC CARBOXYLIC ACID WHEREIN ALL THE CARBOXYLIC GROUPS ARE SUBSTITUTED BY NITRILE GROUPS.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 wherein the nitrile is used in a molar amount at least equal to the molar amount of amine.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1 wherein the nitrile is acetonitrile, butyric acid nitrile or adipic acid dinitrile.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |