US4052343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinked, macroreticular poly(dimethylaminoethyl methacrylate) ion-exchange resins and method of preparation by aqueous suspension polymerization using trialkylamine phase extender
Assignee: Rohm and Haas Co
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Filing: 1975-11-10
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Granted: 1977-10-04
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Expires: 1995-11-10
Abstract
Abstract Novel crosslinked ion exchange resins derived from dimethylaminoethyl methacrylate are disclosed together with their process of manufacture by suspension polymerization preferably utilizing a trialkylamine phase extender. Trialkylamines are found to be useful generally as phase extenders for the preparation of other polymeric materials by the known methods of suspension polymerization.
Inventors
- 👤 Virginia L. Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/12; C08F2/16; C08F2/18; B; B01; B01J; B01J41/00; B01J41/08; B01J41/12; B01J41/14; C08J; C08J9/00; C08J9/28; C08J9/286
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
80 words
A process for preparing a cross-linked macroreticular ion-exchange polymer of dimethylaminoethyl methacrylate which process comprises copolymerizing dimethylaminoethyl methacrylate by suspension polymerization in an aqueous medium with from about 0.5% to about 30% by weight of the total polymer mixture of a polyfunctional crosslinking monomer in the presence of between about 20% and 80% by weight of a trialkylamine phase extender, based on the total weight of the organic mixture, said trialkylamine having alkyl substituents of 2 to 8 carbon atoms.
Claim 2
Dependent Claim
80 words
A process for preparing a cross-linked macroreticular ion-exchange polymer of dimethylaminoethyl methacrylate which process comprises copolymerizing dimethylaminoethyl methacrylate by suspension polymerization in an aqueous medium with from about 0.5% to about 30% by weight of the total polymer mixture of a polyfunctional crosslinking monomer in the presence of between about 20% and 80% by weight of a trialkylamine phase extender, based on the total weight of the organic mixture, said trialkylamine having alkyl substituents of 2 to 8 carbon atoms.
Claim 3
Dependent Claim
44 words
The process set forth in claim 1 wherein the trialkylamine phase extender is selected from those containing individual alkyl groups of two to eight carbon atoms with the sum of the number of carbon atoms in the three alkyl groups between six and 21.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |