US3205204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerization of vinyl chloride
Assignee: Wacker Chemie AG
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Filing: 1961-12-12
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Granted: 1965-09-07
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Expires: 1981-12-12
Abstract
No abstract record available.
Inventors
- 👤 Heckmaier Joseph
- 👤 Bauer Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:19
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/10; C08F14/00; C08F14/02; C08F14/04; C08F14/06; Y; Y10; Y10S; Y10S526/00; Y10S526/909; Y10S526/911
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
IN THE PROCESS OF PREPARING A POLYMERIZATE OF A VINYL MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND MIXTURES OF VINYL CHLORIDE WITH UP TO 10% OF A VINYL ESTER OF A LOWER ALKANOIC ACID, IN WATER IN THE PRESENCE OF A FREE-RADICAL, MONOMER-SOLUBLE POLYMERIZATION CATALYST, WATER-SOLUBLE, INORGANIC BUFFER SALTS, AND A WATERSOLUBLE COLLOIDAL SUSPENSION AGENT, BY AGITATING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 0*C. AND 80*C. FOR A TIME SUFFICIENT TO EFFECT POLYMERIZATION, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS SAID SUSPENSION AGENT ABOUT 0.01% TO 0.25% BASED ON THE WEIGHT OF THE VINYL MONOMER, OF A WATER-SOLUBLE METHYL CELLULOSE PREPARED BY THE REACTION OF LIQUID METHYL CHLORIDE WITH AN ALKALI METAL CELLULOSE AT A TEMPERATURE BETWEEN 40*C. AND 90*C.
Claim 2
Dependent Claim
123 words
IN THE PROCESS OF PREPARING A POLYMERIZATE OF A VINYL MONOMER SELECTED FROM THE GROUP CONSISTING OF VINYL CHLORIDE AND MIXTURES OF VINYL CHLORIDE WITH UP TO 10% OF A VINYL ESTER OF A LOWER ALKANOIC ACID, IN WATER IN THE PRESENCE OF A FREE-RADICAL, MONOMER-SOLUBLE POLYMERIZATION CATALYST, WATER-SOLUBLE, INORGANIC BUFFER SALTS, AND A WATERSOLUBLE COLLOIDAL SUSPENSION AGENT, BY AGITATING THE MIXTURE AT A TEMPERATURE BETWEEN ABOUT 0*C. AND 80*C. FOR A TIME SUFFICIENT TO EFFECT POLYMERIZATION, THE IMPROVEMENT WHICH COMPRISES UTILIZING AS SAID SUSPENSION AGENT ABOUT 0.01% TO 0.25% BASED ON THE WEIGHT OF THE VINYL MONOMER, OF A WATER-SOLUBLE METHYL CELLULOSE PREPARED BY THE REACTION OF LIQUID METHYL CHLORIDE WITH AN ALKALI METAL CELLULOSE AT A TEMPERATURE BETWEEN 40*C. AND 90*C.
References Cited (Backward Citations)
GB754876A
Cited
US2875185A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |