Fluorinated novolak
Abstract
Abstract UNIQUE AND HIGHLY DESIRABLE PROPERTIES ARE EXHIBITED BY A PHENOL-FORMALDEHYDE FLUORINATED NOVOLAK WHEN THE PORDUCT CONTAINS A TRIFLUOROMETHYL GROUP IN A POSITION META TO THE HYDROXYL GROUP IN EACH PHENYL RING IN THE NOVOLAK. AMONG THE DESIRABLE PROPERTIES ARE FLAME RETARDANCE, IMPROVED WEATHERABILITY, RESISTANCE TO HYDROLYSIS BY ACIDS OR ALKALIS, AND RESISTANCE TO THERMAL DEGRADATION. THE NOVOLAK IS PREPARED IN AN ACID CATALYZED REACTION BY CONDENSING FORMALDEHYDE OR A FORMALDEHYDEYIELDING MATERIAL WITH A PHENOLIC COMPOUND CONTAINING A TRIFLUOROMETHYL GROUP IN A POSITION META TO THE HYDROXYL GROUP ON THE PHENYL RING. THE CURED NOVOLAK IS USEFUL AS AN IMPREGNATING RESIN FOR PAPER AND WOOD TO INCREASE ITS MOISTURE RESISTANCE AND WET STRENGTH.
Inventors
- 👤 Stuart B Eglin
- 👤 Edgar W Eisenbraun
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |