US3813353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ion exchange resins from acrolein copolymers
Assignee: Rohm and Haas Co
•
Filing: 1973-02-05
•
Granted: 1974-05-28
•
Expires: 1993-02-05
Abstract
Abstract WEAK BASE ANION EXCHANGE RESINS ARE PREPARED BY THE WALLACH REACTION ON A POLY(ACROLEIN:DIVINYLBENZENE). THE CROSSLINKED POLYACROLEIN IS SUBJECTED TO REACTION WITH A SECONDARY AMINE AND FORMIC ACID TO CONVERT THE ALDEHYDE GROUPS TO THE TERTIARY AMINE FORM. THE RESULTING WEAK BASE ANION EXCHANGER RESINS HAVE GOOD ANION EXCHANGER CAPACITIES, GOOD PHYSICAL STABILITY, GOOD RINSE REQUIREMENTS AND RESISTANCE TO OXIDATION. STRONG BASE ANION EXCHANGE RESINS ARE PREPARED BY REACTION OF THE TERTIARY AMINE PRODUCT WITH A SUITABLE ALKYL HALIDE OR EQUIVALENT MATERIAL. THESE RESINS SHOW EXCELLENT THERMAL STABILITY AND RESISTANCE TO ORGANIC FOULING.
Inventors
- 👤 D Clemens
- 👤 R Lange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:37
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/32; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08F246/00; C08F8/44
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-27 | 1977-11-26 | 1978-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-27 | 1981-11-26 | 1982-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-27 | 1985-11-26 | 1986-05-28 | $7700.00 | Window Closed / Lapsed |