Fast cure epoxy resin coating powders containing adducts of trimellitic anhydride and polyols
Abstract
Abstract POWERED EPOXY RESIN COATING COMPOSITIONS CONSISTING ESSENTIALLY OF A SOLID, ESSENTIALLY LINEAR, EPOXY RESIN HAVING A MOLECULAR WEIGHT OF 2000 TO 6000 AND AN EPOXIDE EQUIVALENCY OF ABOUT 2, A POLYOL-TRIMELLITIC ANHYDRIDE HARDENER SELECTED FROM THE GROUP CONSISTING OF ADDUCTS OF TRIMELLITIC ANHYDRIDE WITH A POLYOL CONTAINING AT LEAST 3 ALCOHOL GROUPS WHICH HAS BEEN INCREASED IN MOLECULAR WEIGHT TO 400-1500 BY ADDITION OF A LOWER ALKYLENE OXIDE, AND POLYOLS CONTAINING AT LEAST SIX ALCOHOL GROUPS, SAID HARDENER PROVIDING TWO ACIDS GROUPS FOR EACH ALCOHOL GROUP OF THE STARTING POLYOL, SAID COMPOSITION CONTAINING APPROXIMATELY ONE EPOXIDE EQUIVALENT OF RESIN TO EACH ACID EQUIVALENT OF ADDUCT, AND A RAPID CURE CATALYST IN THE PROPORTION OF ABOUT 0.2% TO 1.0% BY WEIGHT OF SAID COMPOSITION. WHILE VARIOUS CATALYSTS CAN BE EMPLOYED, THE PREFERRED CATALYST IS TRIPHENYL PHOSPHINE IN THE PROPORTION OF ABOUT 0.2% TO 0.3%.
Inventors
- 👤 Ronald C Benham
Bibliographic Details
Claims Analysis
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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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |