US3933763A
Expired / Lapsed
US
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Polymerization of maleic anhydride and vinyl acetate
Assignee: ChampionX LLC
•
Filing: 1974-07-18
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Granted: 1976-01-20
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Expires: 1994-07-18
Abstract
Abstract Polymerization of maleic anhydride and vinyl acetate is carried out in the presence of a stabilizing agent prepared by copolymerizing maleic anhydride and an alpha-olefin.
Inventors
- 👤 Louis A. Goretta
- 👤 John D. Newkirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:55
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F222/00; C08F222/04; C08F222/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
64 words
A method of polymerizing maleic anhydride and vinyl acetate in a solvent selected from the group consisting of toluene and benzene comprising carrying the polymerization out in the presence of a stabilizing agent comprising a copolymer of maleic anhydride and an alpha-olefin containing from four to 18 carbon atoms, the amount of stabilizing agent being from 0.5 to 6% by weight of maleic anhydride.
Claim 2
Independent Claim
64 words
A method of polymerizing maleic anhydride and vinyl acetate in a solvent selected from the group consisting of toluene and benzene comprising carrying the polymerization out in the presence of a stabilizing agent comprising a copolymer of maleic anhydride and an alpha-olefin containing from four to 18 carbon atoms, the amount of stabilizing agent being from 0.5 to 6% by weight of maleic anhydride.
Claim 3
Dependent Claim
16 words
A method as in claim 1 wherein the alpha-olefin contains from six to 18 carbon atoms.
Claim 4
Dependent Claim
19 words
A method as in claim 1 wherein the stabilizing agent consists of a copolymer of maleic anhydride and hexene-1.
Claim 5
Dependent Claim
18 words
A method as in claim 1 wherein the stabilizing agent comprises a copolymer of maleic anhydride and octadecene-1.
Claim 6
Dependent Claim
24 words
A method as in claim 1 wherein the stabilizing agent is present in am amount from 0.1 to 4.0% by weight of maleic anhydride.
References Cited (Backward Citations)
US3660339A
Cited
US3729451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |