Polyether amines their production and use
Abstract
Abstract THIS INVENTION IS DIRECTED TO NEW, WATER SOLUBLE, HIGH MOLECULAR POLYETHERAMINES AND THEIR SALTS, PRODUCED BY THE REACTION, IN EXCESS, OF ALIPHATIC POLYAMINES WHICH CONTAIN AT LEAST ONE PRIMARY OR TWO SECONDARY AMINO GROUPS, MAY CONTAIN HYDROXYL GROUPS AND HAVE MOLECULAR WEIGHTS NOT GREATER THAN 200, WITH POLYEPIHALOGENOHYDRINS WHICH CONTAIN 3 TO 25 HALOGENOMETHYL GROUPS, FOLLOWED BY REMOVAL OF THE EXCESS POLYAMINE FROM THE REACTION MIXTURE BY DISTILLATION, REACTION OF THE RESULTING POLYETHERAMINE AQUEOUS SOLUTION WITH CROSSLINKING AGENTS TO A DEGREE OF CROSSLINKING AT WHICH A VISCOSITY INCREASE OCCURS AND THE REACTION MIXTURE REMAINS WATER SOLUBLE, AND IF DESIRED PARTIAL OR COMPLEX CONVERSION OF THE FREE AMINO GROUPS INTO THEIR SALTS BY THE ADDITION OF ACIDS. THESE NEW POLYAMINES ARE USEFUL AS FLOCCULATING AND FLOTATION AGENTS AND AS DRAINAGE AND RETENTION AIDS, ESPECIALLY IN PAPER MANUFACTURE.
Inventors
- 👤 G Raspanti
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |