Blends of copolyesters with cured epoxy resins
Abstract
Abstract An improved usually thermosetting copolyester composition comprising: A. AT LEAST ONE SEGMENTED COPOLYESTER POLYMER CONSISTING ESSENTIALLY OF (1) ABOUT 5-85 WEIGHT PERCENT OF RECURRING LONG CHAIN ESTER UNITS DERIVED FROM AT LEAST ONE DICARBOXYLIC ACID HAVING A MOLECULAR WEIGHT BELOW ABOUT 300 AND AT LEAST ONE POLY- (ALKYLENE OXIDE) GLYCOL HAVING A MOLECULAR WEIGHT BETWEEN ABOUT 400-6,000 AND A CARBON-TO-OXYGEN RATIO OF ABOUT 2.0-4.3 AND (2) ABOUT 15-95 WEIGHT PERCENT OF SHORT CHAIN ESTER UNITS WHICH ARE DERIVED FROM AT LEAST ONE LOW MOLECULAR WEIGHT DIOL HAVING A MOLECULAR WEIGHT OF LESS THAN ABOUT 250 AND AT LEAST ONE LOW MOLECULAR WEIGHT DICARBOXYLIC ACID HAVING A MOLECULAR WEIGHT OF LESS THAN ABOUT 300, B. ABOUT 1.0 TO 50 PERCENT BY WEIGHT BASED ON SAID COPOLYESTER, OF A POLYEPOXIDE HAVING A FUNCTIONALITY OF AT LEAST TWO AND C. ABOUT 0.5 TO 1.1 EQUIVALENTS, PER EPOXY EQUIVALENT, OF AN EPOXY CURING AGENT SELECTED FROM AROMATIC AND ALIPHATIC POLYAMINES AND CYCLIC ANHYDRIDES OF POLYCARBOXYLIC ACIDS. Optionally from 0.05 to 0.5 weight percent based on said copolyester of an epoxy catalyst may be included in the composition.
Inventors
- 👤 G Hoeschele
Bibliographic Details
Claims Analysis
Total Claims: 15References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |