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US4585851A
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US
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Process for preparing polyesters and polyestercarbonates polymers which are adaptable for wire enamels
Assignee: Von Roll Isola USA Inc
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Filing: 1984-02-24
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Granted: 1986-04-29
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Expires: 2004-02-24
Abstract
Abstract A method of preparing a polyester resin by polymerizing a mixture of a diaryl terephthalate, a diaryl isophthalate or mixture thereof, a diphenol and a triaryl mellitate.
Inventors
- 👤 Daniel W. Fox
- 👤 John J. Keane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:42
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
A process for making a polyester resin which consists essentially of heating, at a temperature of from about 200° C. to about 270° C. for a period of at least about 2 hours, a mixture consisting essentially of: a. a diaryl terephthalate; b. a diaryl isophthalate; or c. mixtures of a and b above; d. a diphenol; and e. a triaryl mellitate with or without the presence of a diaryl carbonate to provide a copoly carbonate of the polyester.
Claim 2
Dependent Claim
79 words
A process for making a polyester resin which consists essentially of heating, at a temperature of from about 200° C. to about 270° C. for a period of at least about 2 hours, a mixture consisting essentially of: a. a diaryl terephthalate; b. a diaryl isophthalate; or c. mixtures of a and b above; d. a diphenol; and e. a triaryl mellitate with or without the presence of a diaryl carbonate to provide a copoly carbonate of the polyester.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-28 | 1989-10-28 | 1990-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-28 | 1993-10-28 | 1994-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-28 | 1997-10-28 | 1998-04-29 | $7700.00 | Window Closed / Lapsed |