US4487918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of bifunctional polyphenylene ethers
Assignee: Bayer AG
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Filing: 1983-12-30
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Granted: 1984-12-11
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Expires: 2003-12-30
Abstract
Abstract The invention relates to a process for the production of bifunctional polyphenylene ethers.
Inventors
- 👤 Walter Heitz
- 👤 Wilhelm Risse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:16
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/487; C08G18/4879; C08G64/00; C08G64/18; C08G64/183; C08G65/00; C08G65/34; C08G65/48; C08G65/485
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
121 words
A process for the production of bifunctional polyphenylene oxides corresponding to the formula ##STR5## in which R is the same or different and represents hydrogen or alkyl containing from 1 to 4 carbon atoms; X is of the formula ##STR6## in which R 1 is hydrogen or alkyl containing from 1 to 4 carbon atoms; and m and n represent an integer of from 0 to 200; said process comprising reacting 0.5 to 2 moles of carbonyl compounds of the formula ##STR7## with each mole of polyphenylene ethers of the formula ##STR8## in an organic solvent, in the presence of a catalyst at a temperature in the range from -30° to 200° C. and a pressure of 0 to 15 bar.
Claim 2
Dependent Claim
121 words
A process for the production of bifunctional polyphenylene oxides corresponding to the formula ##STR5## in which R is the same or different and represents hydrogen or alkyl containing from 1 to 4 carbon atoms; X is of the formula ##STR6## in which R 1 is hydrogen or alkyl containing from 1 to 4 carbon atoms; and m and n represent an integer of from 0 to 200; said process comprising reacting 0.5 to 2 moles of carbonyl compounds of the formula ##STR7## with each mole of polyphenylene ethers of the formula ##STR8## in an organic solvent, in the presence of a catalyst at a temperature in the range from -30° to 200° C. and a pressure of 0 to 15 bar.
References Cited (Backward Citations)
US3318959A
Cited
US4156770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-11 | 1988-06-11 | 1988-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-11 | 1992-06-11 | 1992-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-11 | 1996-06-11 | 1996-12-11 | $7700.00 | Window Closed / Lapsed |