US3033839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of vinyl chloride in aqueous suspension
Assignee: Wacker Chemie AG
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Filing: 1959-05-05
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Granted: 1962-05-08
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Expires: 1979-05-05
Abstract
No abstract record available.
Inventors
- 👤 Heckmaier Joseph
- 👤 Bauer Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:01
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
IN A PROCESS FOR THE PRODUCTION OF VINYL CHLORIDE POLYMERS INCLUDING POLYVINYL CHLORIDE, AND COPOLYMERS OF VINYL CHLORIDE WITH AN UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH BY POLYMERIZATION IN AN AQUEOUS SUSPENSION POLYMERIZATION MEDIUM, THE STEPS WHICH COMPRISE INITIATING THE POLYMERIZATION IN AN AQUEOUS SUSPENSION POLYMERIZATION OF THE MONOMER SYSTEM CONSISTING OF THE MONOMER, A MONOMER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND A PROTECTIVE COLLOID SELECTED FROM THE GROUP CONSISTING OF METHYL CELLULOSE AND POLYVINYL ALCOHOL AS THE SOLE ACTIVE COMPONENTS AT A TEMPERATURE OF FROM 45*C. TO 65*C., CONTINUING THE POLYMERIZATION AT SAID TEMPERATURE UNTIL ABOUT 45% OF THE MONOMER PRESENT HAS BEEN POLYMERIZED, THEN LOWERING THE TEMPERATURE OF THE AQUEOUS POLYMERIZATION MEDIUM FROM 5 *C. TO 35*C. BELOW THE INITIAL POLYMERIZATION TEMPERATURE BUT MAINTAINING IT ABOVE THE FREEZING POINT, AND COMPLETING THE AQUEOUS SUSPENSION POLYMERIZATION AT SAID LOWER TEMPERATURE.
Claim 2
Dependent Claim
137 words
IN A PROCESS FOR THE PRODUCTION OF VINYL CHLORIDE POLYMERS INCLUDING POLYVINYL CHLORIDE, AND COPOLYMERS OF VINYL CHLORIDE WITH AN UNSATURATED MONOMER COPOLYMERIZABLE THEREWITH BY POLYMERIZATION IN AN AQUEOUS SUSPENSION POLYMERIZATION MEDIUM, THE STEPS WHICH COMPRISE INITIATING THE POLYMERIZATION IN AN AQUEOUS SUSPENSION POLYMERIZATION OF THE MONOMER SYSTEM CONSISTING OF THE MONOMER, A MONOMER-SOLUBLE PEROXIDE POLYMERIZATION CATALYST AND A PROTECTIVE COLLOID SELECTED FROM THE GROUP CONSISTING OF METHYL CELLULOSE AND POLYVINYL ALCOHOL AS THE SOLE ACTIVE COMPONENTS AT A TEMPERATURE OF FROM 45*C. TO 65*C., CONTINUING THE POLYMERIZATION AT SAID TEMPERATURE UNTIL ABOUT 45% OF THE MONOMER PRESENT HAS BEEN POLYMERIZED, THEN LOWERING THE TEMPERATURE OF THE AQUEOUS POLYMERIZATION MEDIUM FROM 5 *C. TO 35*C. BELOW THE INITIAL POLYMERIZATION TEMPERATURE BUT MAINTAINING IT ABOVE THE FREEZING POINT, AND COMPLETING THE AQUEOUS SUSPENSION POLYMERIZATION AT SAID LOWER TEMPERATURE.
References Cited (Backward Citations)
US2395344A
Cited
US2259180A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |