US2640050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of copolymerizing vinylidene chloride and vinyl chloride
Assignee: Dow Chemical Co
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Filing: 1950-04-12
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Granted: 1953-05-26
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Expires: 1970-04-12
Abstract
No abstract record available.
Inventors
- 👤 Fevre Walter J Le
- 👤 Harold W Moll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:32
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/02; C08F214/04; C08F214/06; C08F214/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
172 words
THE METHOD WHICH COMPRISES COPOLYMERIZING, IN AQUEOUS EMULSION AND IN A CLOSED VESSEL, A MONOMERIC MIXTURE AT LEAST 80 PER CENT OF WHICH CONSISTS OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE IN PROPORTIONS BETWEEN 35 AND 70 PER CENT BY WEIGHT OF VINYLIDENE CHLORIDE AND COMPLEMENTARILY BETWEEN 65 AND 30 PER CENT OF VINYL CHLORIDE, ONLY UNTIL FROM 10 TO 60 PER CENT OF THE MIXTURE OF MONOMERS HAS POLYMERIZED, AS EVIDENCED BY A CORRESPONDING INCREASE IN PRESSURE IN THE VESSEL AT THE SUBSTANTIALLY CONSTANT REACTION TEMPERATURE BY ABOUT 2 TO 12 POUNDS PER SQUARE INCH, THEN ADDING AT ONE TIME ENOUGH MORE MONOMER, CONSISTING OF VINYLIDENE CHLORIDE TO INCREASE THE OVERALL RATIO OF VINYLIDENE CHLORIDE TO VINYL CHLORIDE TO A HIGHER VALUE IN THE RANGE FROM 65 TO 95 PER CENT VINYLIDENE CHLORIDENE AND COMPLEMENTARILY FROM 35 TO 5 PER CENT VINYL CHLORIDE, CONTINUING THE POLYMERIZATION REACTION AFTER SAID VINYLIDENE CHLORIDE ADDITION UNTIL FROM 80 TO 90 PER CENT OF THE TOTAL MONOMERIC CHARGE IS COPOLYMERIZED, AND THEREUPON RECOVERING THE COPOLYMERIC PRODUCT.
Claim 2
Independent Claim
172 words
THE METHOD WHICH COMPRISES COPOLYMERIZING, IN AQUEOUS EMULSION AND IN A CLOSED VESSEL, A MONOMERIC MIXTURE AT LEAST 80 PER CENT OF WHICH CONSISTS OF VINYLIDENE CHLORIDE AND VINYL CHLORIDE IN PROPORTIONS BETWEEN 35 AND 70 PER CENT BY WEIGHT OF VINYLIDENE CHLORIDE AND COMPLEMENTARILY BETWEEN 65 AND 30 PER CENT OF VINYL CHLORIDE, ONLY UNTIL FROM 10 TO 60 PER CENT OF THE MIXTURE OF MONOMERS HAS POLYMERIZED, AS EVIDENCED BY A CORRESPONDING INCREASE IN PRESSURE IN THE VESSEL AT THE SUBSTANTIALLY CONSTANT REACTION TEMPERATURE BY ABOUT 2 TO 12 POUNDS PER SQUARE INCH, THEN ADDING AT ONE TIME ENOUGH MORE MONOMER, CONSISTING OF VINYLIDENE CHLORIDE TO INCREASE THE OVERALL RATIO OF VINYLIDENE CHLORIDE TO VINYL CHLORIDE TO A HIGHER VALUE IN THE RANGE FROM 65 TO 95 PER CENT VINYLIDENE CHLORIDENE AND COMPLEMENTARILY FROM 35 TO 5 PER CENT VINYL CHLORIDE, CONTINUING THE POLYMERIZATION REACTION AFTER SAID VINYLIDENE CHLORIDE ADDITION UNTIL FROM 80 TO 90 PER CENT OF THE TOTAL MONOMERIC CHARGE IS COPOLYMERIZED, AND THEREUPON RECOVERING THE COPOLYMERIC PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-25 | 1956-11-24 | 1957-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-25 | 1960-11-24 | 1961-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-25 | 1964-11-24 | 1965-05-26 | $7700.00 | Window Closed / Lapsed |