US3027358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of copolymers of vinyl chloride and fumaric acid esters
Assignee: Wacker Chemie AG
•
Filing: 1959-07-20
•
Granted: 1962-03-27
•
Expires: 1979-07-20
Abstract
No abstract record available.
Inventors
- 👤 Ebersbach Hans-Walter
- 👤 Heckmaier Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:00
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
PROCESS FOR THE PRODUCTION OF COPOLYMERS OF VINYL CHLORIDE WITH A DIALKYL ESTER OF FUMARIC ACID BY SUSPENSION POLYMERIZATION, WHICH COMPRISES FORMING AN AQUEOUS POLYMERIZATION REACTION MEDIUM IN WHICH THE AQUEOUS PHASE IS MAINTAINED BETWEEN PH 4.5 AND 8, SAID MEDIUM CONTAINING A HYDROXYALKYL CELLULOSE AS A PROTECTIVE COLLOID TOGETHER WITH FROM 80 TO 99 MOL PERCENT OF VINYL CHLORIDE AND 1 TO 20 MOL PERCENT OF A DIALKYL ESTER OF FUMARIC ACID HAVING THE EMPIRICAL FORMULA CNH2N-4O4, WHEREIN N IS AN INTEGER OF FROM 14 TO 44, SAID HYDROXYALKYL CELLULOSE BEING PRESENT IN A CONCENTRATION NOT GREATER THAN 0.5% ON THE WEIGHT OF THE MONOMERS PRESENT AND NOT MORE THAN 0.3% ON THE WEIGHT OF THE AQUEOUS PHASE, AND CAUSING THE MONOMERS IN SAID REACTION MIXTURE TO UNDER GO COPOLYMERIZATION WITH THE AID OF ORGANIC PEROXIDES BY HEATING THE REACTION MIXTURE TO A POLYMERIZATION REACTION TEMPERATURE.
Claim 2
Dependent Claim
147 words
PROCESS FOR THE PRODUCTION OF COPOLYMERS OF VINYL CHLORIDE WITH A DIALKYL ESTER OF FUMARIC ACID BY SUSPENSION POLYMERIZATION, WHICH COMPRISES FORMING AN AQUEOUS POLYMERIZATION REACTION MEDIUM IN WHICH THE AQUEOUS PHASE IS MAINTAINED BETWEEN PH 4.5 AND 8, SAID MEDIUM CONTAINING A HYDROXYALKYL CELLULOSE AS A PROTECTIVE COLLOID TOGETHER WITH FROM 80 TO 99 MOL PERCENT OF VINYL CHLORIDE AND 1 TO 20 MOL PERCENT OF A DIALKYL ESTER OF FUMARIC ACID HAVING THE EMPIRICAL FORMULA CNH2N-4O4, WHEREIN N IS AN INTEGER OF FROM 14 TO 44, SAID HYDROXYALKYL CELLULOSE BEING PRESENT IN A CONCENTRATION NOT GREATER THAN 0.5% ON THE WEIGHT OF THE MONOMERS PRESENT AND NOT MORE THAN 0.3% ON THE WEIGHT OF THE AQUEOUS PHASE, AND CAUSING THE MONOMERS IN SAID REACTION MIXTURE TO UNDER GO COPOLYMERIZATION WITH THE AID OF ORGANIC PEROXIDES BY HEATING THE REACTION MIXTURE TO A POLYMERIZATION REACTION TEMPERATURE.
References Cited (Backward Citations)
US2194354A
Cited
US2470909A
Cited
US2580277A
Cited
US2538051A
Cited
US2689836A
Cited
US2823200A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-03-26 | 1965-09-25 | 1966-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-03-26 | 1969-09-25 | 1970-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-03-26 | 1973-09-25 | 1974-03-27 | $7700.00 | Window Closed / Lapsed |