Patent US3607980A successfully refreshed from Google Patents.
US3607980A
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Method of polymerizing vinyl chloride with ethylene-vinyl acetate copolymers
Assignee: Produits Chimiques Pechiney Saint Gobain
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Filing: 1967-11-02
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Granted: 1971-09-21
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Expires: 1987-11-02
Abstract
Abstract Resins of high shock resistance when shaped as tubes, rods, plates or the like are prepared by dissolving a copolymer of vinyl acetate and ethylene in liquid vinyl chloride, partly polymerizing another quantity of vinyl chloride with high turbulence in mass, mixing the solution of vinyl acetate-ethylene copolymer and the suspension of polyvinyl chloride in vinyl chloride, and subjecting this mixture to conditions of temperature, pressure, agitation and catalysis favorable to graft polymerization in mass of vinyl chloride on the vinyl acetateethylene copolymer.
Inventors
- 👤 Jean Claude Thomas
- 👤 Francis Fournel
- 👤 Salomon Soussan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:19
CPC Classifications
C; C08; C08F; C08F255/00; C08F255/02; C08F255/026; C08F263/00; C08F263/02; C08F263/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
28 words
A process according to claim 1 in which the copolymer is dissolved in liquid vinyl chloride containing polymerization catalyst at a temperature of from 15* to 30* C.
Claim 2
Dependent Claim
28 words
A process according to claim 1 in which the copolymer is dissolved in liquid vinyl chloride free of catalyst at a temperature of from 40* to 70* C.
Claim 3
Dependent Claim
21 words
A process according to claim 1 in which the copolymer contains from about 30 percent to 50 percent of vinyl acetate.
Claim 4
Dependent Claim
16 words
A process according to claim 4 in which said copolymer contains about 33 percent vinyl acetate.
Claim 5
Dependent Claim
20 words
A process according to claim 4 in which said copolymer contains about 45 percent vinyl acetate. optimum with composition extraction
Claim 6
Dependent Claim
36 words
A process according to claim 1 in which the weight of vinyl chloride subjected to said first step of homopolymerization is about 30 percent to about 90 percent of the weight of total vinyl chloride used.
Claim 7
Dependent Claim
28 words
A process according to claim 1 in which the catalysts used in the polymerizations are selected from the group consisting of azobisisobutyronitrile, lauroyl peroxide, isopropylperoxydicarbonate, and acetyl-cyclohexanesulfonyl peroxide.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |