Patent US2674593A successfully refreshed from Google Patents.
US2674593A
Expired / Lapsed
US
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Production and treatment of vinyl chloride polymer
Assignee: Shell Development Co
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Filing: 1951-07-24
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Granted: 1954-04-06
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Expires: 1971-07-24
Abstract
No abstract record available.
Inventors
- 👤 Fred E Condo
- 👤 Jerome R Vinograd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR PRODUCING POLYMER OF VINYL CHLORIDE ADAPTED FOR PRODUCTION OF PLASTISOLS WHICH RETAIN MOBILE FLUIDITY UPON STORAGE OVER EXTENDED PERIODS OF TIME WHICH COMPRISES THE COMBINATION OF STEPS IN SERIATIM OF EMULSIFYING LIQUID MONOMERIC VINYL CHLORIDE HAVING NOT MORE THAN ABOUT 5% BY WEIGHT OF ANOTHER MONO-OLEFINIC POLYMERIZABLE COMPOUND IN ADMIXTURE THEREWITH AND ALSO CONTAINING A PEROXIDE POLYMERIZATION CATALYST DISSOLVED THEREIN WITH AN AQUEOUS SOLUTION CONTAINING ABOUT 0.1 TO 5% BY WEIGHT OF AN EMULSIFYING AGENT, HOMOGENIZING THE EMULSION BY SUBJECTING IT TO VIOLENT SHEARING ACTION, HEATING THE HOMOGENIZED EMULSION WITH AGITATION AT A TEMPERATURE OF ABOUT 30* C. TO 60* C. TO THEREBY POLYMERIZE THE VINYL CHLORIDE, VENTING UNPOLYMERIZED VINYL CHLORIDE FROM THE EMULSION AND THEREBY SUBSTANTIALLY FREEING THE POLYMER EMULSION OF UNPOLYMERIZED VINYL CHLORIDE, AND THEN SUBSEQUENTLY HEATING UNCOAGULATED
Claim 2
Dependent Claim
133 words
A PROCESS FOR PRODUCING POLYMER OF VINYL CHLORIDE ADAPTED FOR PRODUCTION OF PLASTISOLS WHICH RETAIN MOBILE FLUIDITY UPON STORAGE OVER EXTENDED PERIODS OF TIME WHICH COMPRISES THE COMBINATION OF STEPS IN SERIATIM OF EMULSIFYING LIQUID MONOMERIC VINYL CHLORIDE HAVING NOT MORE THAN ABOUT 5% BY WEIGHT OF ANOTHER MONO-OLEFINIC POLYMERIZABLE COMPOUND IN ADMIXTURE THEREWITH AND ALSO CONTAINING A PEROXIDE POLYMERIZATION CATALYST DISSOLVED THEREIN WITH AN AQUEOUS SOLUTION CONTAINING ABOUT 0.1 TO 5% BY WEIGHT OF AN EMULSIFYING AGENT, HOMOGENIZING THE EMULSION BY SUBJECTING IT TO VIOLENT SHEARING ACTION, HEATING THE HOMOGENIZED EMULSION WITH AGITATION AT A TEMPERATURE OF ABOUT 30* C. TO 60* C. TO THEREBY POLYMERIZE THE VINYL CHLORIDE, VENTING UNPOLYMERIZED VINYL CHLORIDE FROM THE EMULSION AND THEREBY SUBSTANTIALLY FREEING THE POLYMER EMULSION OF UNPOLYMERIZED VINYL CHLORIDE, AND THEN SUBSEQUENTLY HEATING UNCOAGULATED
References Cited (Backward Citations)
US2068424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |