Polyamine curing agents for use in preparing polyurethane elastomers and foams
Abstract
Abstract AMINE CURING AGENTS FOR LIQUID ISOCYANATO-TERMINATED POLYURETHANES OBTAINED BY CONDENSING A MONOAMINE COMPOSITION WITH FORMALDEHYDE IN THE PRESENCE OF A MINERAL ACID. THE MONOAMINE CAN BE 2-CHLOROANILINE OR MIXTURES OF 2-CHLOROANILINE WITH ANILINE AND/OR O-TOLUIDINE. THE PROPORTIONS OF REACTANTS ARE SELECTED TO PRODUCE CURING AGENTS WHICH HAVE MODERATE REACTIVITIES AND EXHIBIT A LIMITED TENDENCY TO CRYSTALLIZED UNDER NORMAL OPERATION CONDITIONS. THE AMINE COMPOSITIONS ARE PARTICULARLY USEFUL AS CURING AGENTS IN THE PREPARATION OF POLYURETHANE FOAMS. THE NEW COMPOUNDS, 3-CHLORO-4,4''-DIAMINODIPHENYLMETHANE AND 3-CHLORO-3''-METHYL-4,4''-DIAMINODIPHENYLMETHANE CAN BE OBTAINED FROM APPROPRIATE REACTION PRODUCTS.
Inventors
- 👤 Guenther Kurt Hoeschele
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |