Patent US4137382A successfully refreshed from Google Patents.
US4137382A
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Process for copolymerizing ethylene, vinyl acetate and carbon monoxide to provide copolymers of reduced melt flow rate
Assignee: Millennium Petrochemicals Inc
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Filing: 1977-09-12
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Granted: 1979-01-30
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Expires: 1997-09-12
Abstract
Abstract A termonomer mixture of ethylene, vinyl acetate and not more than about 5 weight percent carbon monoxide is copolymerized to provide a resin of desirable rheological properties e.g. low Melt Flow Rate and a high melt viscosity, when prepared at temperatures not exceeding about 260 DEG F.
Inventors
- 👤 Clarence J. Vetter, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:23
CPC Classifications
C; C08; C08G; C08G67/00; C08G67/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
80 words
A process for preparing a copolymer of ethylene, vinyl acetate and carbon monoxide which comprises introducing a copolymerizable mixture containing from about 15 to about 85 percent by weight ethylene, the balance being made up of vinyl acetate and not more than about 5 percent carbon monoxide by weight of the entire mixture, into a polymerization zone and copolymerizing said mixture at an elevated pressure and an average temperature within the range from about 170° F. to about 240° F.
Claim 2
Dependent Claim
80 words
A process for preparing a copolymer of ethylene, vinyl acetate and carbon monoxide which comprises introducing a copolymerizable mixture containing from about 15 to about 85 percent by weight ethylene, the balance being made up of vinyl acetate and not more than about 5 percent carbon monoxide by weight of the entire mixture, into a polymerization zone and copolymerizing said mixture at an elevated pressure and an average temperature within the range from about 170° F. to about 240° F.
Claim 3
Dependent Claim
41 words
The process of claim 1 in which the termonomer mixture contains from about 40 to about 70% ethylene by weight, from about 25 to about 55% vinyl acetate by weight and from about 1 to about 5% carbon monoxide by weight.
Claim 4
Dependent Claim
31 words
The process of claim 1 in which an amount of one or more other ethylenically unsaturated monomers copolymerizable with ethylene, vinyl acetate and carbon monoxide is present in the copolymerizable mixture.
Claim 5
Dependent Claim
21 words
The process of claim 1 wherein the pressure within the polymerization zone is from about 5,000 p.s.i. to about 60,000 p.s.i.
Claim 6
Dependent Claim
16 words
The process of claim 1 carried out in the presence of a free radical polymerization initiator.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |