Patent US4129534A successfully refreshed from Google Patents.
US4129534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(dimethylaminoethyl methacrylate) and method of preparation
Assignee: Rohm and Haas Co
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Filing: 1977-08-11
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Granted: 1978-12-12
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Expires: 1997-08-11
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
2026-10-31 15:07
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
57 words
In the process for manufacturing macroreticular crosslinked polymers by suspension polymerization of monomers in the presence of a phase extender, the improvement which comprises utilizing a trialkylamine wherein the alkyl groups contain 2 to 8 carbon atoms as the phase extender, wherein the trialkylamine comprises between about 20% and 80% by weight of the total organic mixture.
Claim 2
Dependent Claim
57 words
In the process for manufacturing macroreticular crosslinked polymers by suspension polymerization of monomers in the presence of a phase extender, the improvement which comprises utilizing a trialkylamine wherein the alkyl groups contain 2 to 8 carbon atoms as the phase extender, wherein the trialkylamine comprises between about 20% and 80% by weight of the total organic mixture.
Claim 3
Dependent Claim
59 words
The process set forth in claim 1 wherein the extender is selected from those trialkylamines 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 twenty-one, wherein the trialkylamine comprises between about 20% and 80% by weight of the total organic mixture.
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) | 1981-12-11 | 1982-06-12 | 1982-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-12-11 | 1986-06-12 | 1986-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-12-11 | 1990-06-12 | 1990-12-12 | $7700.00 | Window Closed / Lapsed |