US2537020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing maleic anhydride interpolymers
Assignee: Monsanto Chemicals Ltd
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Filing: 1949-03-30
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Granted: 1951-01-09
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Expires: 1969-03-30
Abstract
No abstract record available.
Inventors
- 👤 Gerald R Barrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:13
CPC Classifications
C; C08; C08F; C08F22/00; C08F22/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
THE PROCESS WHICH COMPRISES HEATING A MIXTURE OF A POLYMERIZABLE VINYL COMPOUND HAVING THE STRUCTURAL FORMULA R-CH=CH2, WHERE R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHENYL AND A SUBSTITUTED PHENYL RADICAL, WITH AN ETHYLENE A,B DICARBOXYLIC ANHYDRIDE IN THE PRESENCE OF AN ALKYL HALF ESTER OF AN ETHYLENE A,B DICARBOXYLIC ACID, IN WHICH THE ALKYL RADICAL CONTAINS FROM 1 TO 3 CARBON ATOMS, UNTIL POLYMERIZATION IS INITIATED AND EXOTHERMIC REACTION BEGINS, COOLING THE RESULTING MASS SUFFICIENTLY TO CONTROL THE POLYMERIZATION REACTION DURING AT LEAST THE MAJOR PORTION OF THE PERIOD OF HEAT GENERATION, AND THEN HEATING THE MASS UNTIL THE POLYMERIZATION REACTION IS SUBSTANTIALLY COMPLETE, SAID VINYL COMPOUND AND SAID DICARBOXYLIC COMPONENTS BEING PRESENT IN A MOLAR RATIO BETWEEN 1:1 AND 1:5:1, SAID DICARBOXYLIC ANHYDRIDE AND SAID ALKYL HALF ESTER BEING PRESENT IN A MOLAR RATIO BETWEEN 1:0.1 AND 1:1.5.
Claim 2
Dependent Claim
143 words
THE PROCESS WHICH COMPRISES HEATING A MIXTURE OF A POLYMERIZABLE VINYL COMPOUND HAVING THE STRUCTURAL FORMULA R-CH=CH2, WHERE R IS A MEMBER SELECTED FROM THE GROUP CONSISTING OF PHENYL AND A SUBSTITUTED PHENYL RADICAL, WITH AN ETHYLENE A,B DICARBOXYLIC ANHYDRIDE IN THE PRESENCE OF AN ALKYL HALF ESTER OF AN ETHYLENE A,B DICARBOXYLIC ACID, IN WHICH THE ALKYL RADICAL CONTAINS FROM 1 TO 3 CARBON ATOMS, UNTIL POLYMERIZATION IS INITIATED AND EXOTHERMIC REACTION BEGINS, COOLING THE RESULTING MASS SUFFICIENTLY TO CONTROL THE POLYMERIZATION REACTION DURING AT LEAST THE MAJOR PORTION OF THE PERIOD OF HEAT GENERATION, AND THEN HEATING THE MASS UNTIL THE POLYMERIZATION REACTION IS SUBSTANTIALLY COMPLETE, SAID VINYL COMPOUND AND SAID DICARBOXYLIC COMPONENTS BEING PRESENT IN A MOLAR RATIO BETWEEN 1:1 AND 1:5:1, SAID DICARBOXYLIC ANHYDRIDE AND SAID ALKYL HALF ESTER BEING PRESENT IN A MOLAR RATIO BETWEEN 1:0.1 AND 1:1.5.
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) | 1954-01-08 | 1954-07-10 | 1955-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-08 | 1958-07-10 | 1959-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-08 | 1962-07-10 | 1963-01-09 | $7700.00 | Window Closed / Lapsed |