Patent US2899331A successfully refreshed from Google Patents.
Patent US4618655A successfully refreshed from Google Patents.
US4618655A
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Process for preparation of polymers containing dicarboxylic acid cyclic imide units in a solid/liquid slurry
Assignee: Lyondell Chemical Technology LP
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Filing: 1984-12-03
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Granted: 1986-10-21
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Expires: 2004-12-03
Abstract
Abstract An improved process for producing polymers containing styrene moieties and cyclic imide moieties by reacting a styrene/maleic anhydride copolymer with a primary amine is improved by conducting the reaction in a heterogeneous slurry of polymer and amine reactants with an aromatic hydrocarbon dispersing agent having a boiling point above 120° C. and simultaneously removing water formed as the reaction proceeds.
Inventors
- 👤 David C. Dehm
- 👤 H. Franklin Lawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:30
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C08; C08F; C08F8/00; C08F8/44; C08F8/48; C08F2800/00; C08F2800/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
104 words
In the process for producing a sulfonated polymer containing styrene moieties and cyclic imide moieties by reacting a copolymer containing styrene moieties and cyclic carboxylic anhydride moieties with a primary amine followed by sulfonation, the improvement comprises conducting the imidization of the anhydride moieties by reacting the primary amine with the copolymer slurried in an aromatic hydrocarbon having a boiling point greater than 120° C. and simultaneously removing water formed as the reaction proceeds, wherein the aromatic hydrocarbon does not dissolve the copolymer and the imidization reaction is conducted in a heterogenous slurry of the primary amine, the undissolved copolymer and the aromatic hydrocarbon.
Claim 2
Dependent Claim
104 words
In the process for producing a sulfonated polymer containing styrene moieties and cyclic imide moieties by reacting a copolymer containing styrene moieties and cyclic carboxylic anhydride moieties with a primary amine followed by sulfonation, the improvement comprises conducting the imidization of the anhydride moieties by reacting the primary amine with the copolymer slurried in an aromatic hydrocarbon having a boiling point greater than 120° C. and simultaneously removing water formed as the reaction proceeds, wherein the aromatic hydrocarbon does not dissolve the copolymer and the imidization reaction is conducted in a heterogenous slurry of the primary amine, the undissolved copolymer and the aromatic hydrocarbon.
Claim 3
Dependent Claim
14 words
The process according to claim 1 wherein the aromatic hydrocarbon dispersing agent is xylene.
Claim 4
Dependent Claim
14 words
The process according to claim 1 wherein the copolymer is a styrene/maleic anhydride copolymer.
Claim 5
Dependent Claim
11 words
The process according to claim 1 wherein the amine is aniline.
Claim 6
Dependent Claim
22 words
The process according to claim 1 wherein the copolymer and the amine are reacted at the reflux temperature of the heterogeneous slurry.
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) | 1989-10-20 | 1990-04-21 | 1990-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-20 | 1994-04-21 | 1994-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-20 | 1998-04-21 | 1998-10-21 | $7700.00 | Window Closed / Lapsed |