US2968651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing normally crystalline vinylidene chloride polymers
Assignee: Dow Chemical Co
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Filing: 1957-02-08
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Granted: 1961-01-17
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Expires: 1977-02-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Louis C Friedrich
- 👤 James W Peters
- 👤 Marion R Rector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:00
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/08; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
150 words
A PROCESS FOR POLYMERIZING A MONOMERIC MATERIAL CONSISTING OF FROM 70 TO 100 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE AND FROM 30 TO 0 PERCENT BY WEIGHT OF A COMONOMER IN WHCIH (1) SAID MONORMERIC MATERIAL IS PLACED IN A CLOSED VESSEL TOGETHER WITH FROM 0.1 TO 1.0 PERCENT BY WEIGHT OF A FREE RADICAL POLYMERIZATION CATALYST SOLUBLE IN THE MOMOMER AND (2) SAID MONOMERIC MATERIAL AND CATALYST IS DISPERSED IN FROM 1 TO 4 PARTS BY WEIGHT BASED ON THE WEIGHT OF SAID MONOMERIC MATERIAL OF AN AQUEOUS PHASE CONTAINING FROM 0.01 TO 0.06 PERCENT BY WEIGHT OF WATER SOLUBLE METHYL HYDROXYPROPYL CELLULOSE OF A VISCOSITY GRADE OF FROM 100 TO 1500 CENTIPOISES, ALL PERCENTAGES BEING BASED ON THE WEIGHT OF SAID MONOMERIC MATERIAL, AND (3) THE DISPERSION OF THE POLYMERIZING PARTICLES IS MAINTAINED WITH AGITATION AT A TEMPERATURE OF FROM 35 TO 75* C. UNTIL POLYMERIZATION IS COMPLETE.
Claim 2
Dependent Claim
150 words
A PROCESS FOR POLYMERIZING A MONOMERIC MATERIAL CONSISTING OF FROM 70 TO 100 PERCENT BY WEIGHT OF VINYLIDENE CHLORIDE AND FROM 30 TO 0 PERCENT BY WEIGHT OF A COMONOMER IN WHCIH (1) SAID MONORMERIC MATERIAL IS PLACED IN A CLOSED VESSEL TOGETHER WITH FROM 0.1 TO 1.0 PERCENT BY WEIGHT OF A FREE RADICAL POLYMERIZATION CATALYST SOLUBLE IN THE MOMOMER AND (2) SAID MONOMERIC MATERIAL AND CATALYST IS DISPERSED IN FROM 1 TO 4 PARTS BY WEIGHT BASED ON THE WEIGHT OF SAID MONOMERIC MATERIAL OF AN AQUEOUS PHASE CONTAINING FROM 0.01 TO 0.06 PERCENT BY WEIGHT OF WATER SOLUBLE METHYL HYDROXYPROPYL CELLULOSE OF A VISCOSITY GRADE OF FROM 100 TO 1500 CENTIPOISES, ALL PERCENTAGES BEING BASED ON THE WEIGHT OF SAID MONOMERIC MATERIAL, AND (3) THE DISPERSION OF THE POLYMERIZING PARTICLES IS MAINTAINED WITH AGITATION AT A TEMPERATURE OF FROM 35 TO 75* C. UNTIL POLYMERIZATION IS COMPLETE.
References Cited (Backward Citations)
US2494517A
Cited
US2538051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-17 | 1964-07-18 | 1965-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-17 | 1968-07-18 | 1969-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-17 | 1972-07-18 | 1973-01-17 | $7700.00 | Window Closed / Lapsed |