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US2960728A
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Preparation of porous vinyl chloride polymer films
Assignee: Monsanto Chemicals Ltd
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Filing: 1957-04-15
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Granted: 1960-11-22
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Expires: 1977-04-15
Abstract
No abstract record available.
Inventors
- 👤 Ludwig A Beer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:37
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S264/00; Y10S264/63
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
IN THE METHOD FOR PREPARING A FILM OF A PLASTICIZED VINYL CHLORIDE POLYMER IN WHICH A DISPERSION OF A VINYL CHLORIDE POLYMER IN A PLASTICIZER THEREFORE IS CAST INTO AT THIN FILM AND FUSED BY HEATING TO A TEMPERATURE OF AT LEAST 150*C., THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE DISPERSION OF THE VINYL CHLORIDE POLYMER AN INORGANIC FILLER HAVING A PARTICLE SIZE OF LESS THAN ABOUT 10 MICRONS AND HAVING ADSORBED THEREON WATER IN THE AMOUNT OF AT LEAST ABOUT 50% OF ITS WEIGHT, SAID FILLER BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE 2-20 PARTS OF WATER PER 100 PARTS OF COMBINED VINYL CHLORIDE POLYMER AND PLASTICIZER.
Claim 2
Dependent Claim
109 words
IN THE METHOD FOR PREPARING A FILM OF A PLASTICIZED VINYL CHLORIDE POLYMER IN WHICH A DISPERSION OF A VINYL CHLORIDE POLYMER IN A PLASTICIZER THEREFORE IS CAST INTO AT THIN FILM AND FUSED BY HEATING TO A TEMPERATURE OF AT LEAST 150*C., THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN THE DISPERSION OF THE VINYL CHLORIDE POLYMER AN INORGANIC FILLER HAVING A PARTICLE SIZE OF LESS THAN ABOUT 10 MICRONS AND HAVING ADSORBED THEREON WATER IN THE AMOUNT OF AT LEAST ABOUT 50% OF ITS WEIGHT, SAID FILLER BEING PRESENT IN AN AMOUNT SUFFICIENT TO PROVIDE 2-20 PARTS OF WATER PER 100 PARTS OF COMBINED VINYL CHLORIDE POLYMER AND PLASTICIZER.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-22 | 1964-05-23 | 1964-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-22 | 1968-05-23 | 1968-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-22 | 1972-05-23 | 1972-11-22 | $7700.00 | Window Closed / Lapsed |