Unsaturated polyester resinous compositions
Abstract
Abstract THIS INVENTION PROVIDES A LIQUID, POLYMERIZABLE COMPOSITION OF MATTER, SUITABLE FOR MOLDING GLASS FIBROUS REINFORCED ARTICLES WITH EXCEPTIONALLY SMOOTH SURFACE, SAID COMPOSITION BEING CURABLE UNDER HEAT AND PRESSURE TO FORM A RIGID, CURED PRODUCT WHICH IS CHARACTERIZED BY AN OPTICALLY HETEROGENEOUS APPEARANCE. THE COMPOSITION COMPRISES AN A,B-ETHYLENICALLY UNSATURATED POLYMERIZABLE POLYESTER HAVING A MOLECULAR WEIGHT PER DOUBLE BOND FACTOR OF 150 TO 186, A MONOMER CONTAINING A CH2=C< GROUP COPOLYMERIZABLE WITH THE UNSATURATED POLYESTER, AND A THERMOPLASTIC POLYMER WHICH IS SOLUBLE IN THE MONOMER BUT WHICH, WHEN PRESENT DURING THE COPOLYMERI- ZATION OF THE UNSATURATED POLYESTER AND THE MONOMER, YIELDS AN OPTICALLY HETEROGENEOUS CURED COMPOSITION.
Inventors
- 👤 Charles Henry Kroekel
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |