US3049520A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of an auxiliary suspending agent to be used for obtaining, by a suspension polymerization process, polyvinyl chloride having a high porosity and a non-glasslike surface
Assignee: Sicedison SpA
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Filing: 1959-08-27
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Granted: 1962-08-14
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Expires: 1979-08-27
Abstract
No abstract record available.
Inventors
- 👤 Gatta Giorgio
- 👤 Benetta Gianni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:18
CPC Classifications
C; C08; C08F; C08F16/00; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F263/00; C08F263/02; C08F263/04; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
THE METHOD OF PREPARING AN AUXILLIARY SUSPENDING AGENT SUITABLE FOR EMPLOYMENT IN THE SUSPENSION-POLYMERIZATION OF VINYL CHLORIDE, COMPRISING REFLUXING A MIXTURE OF FROM 70 TO 97 PARATS BY WEIGHT OF VINYL ACETATE AND 3 TO 30 PARTS BY WEIGHT OF ALLYL ALCOHOL IN 25 TO 400 PARTS OF WATER CONTAINING AN ORGANIC POLYMERIC SUSPENDING AGENT, SAID REFLUXING CARRIED OUT FOR A PERIOD OF FROM 18 TO 48 HOURS IN A TEMPERATURE RANGE OF 40*C. TO 67*C. AND AT ATMOSPHERIC PRESSURE, SAID REFLEXING CARRIED OUT IN THE PRESENCE OF A POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF: HYDROGEN, LAUROYL, BENZOYL, TOTYL, ACETYL, AND PROPIONYL PEROXIDE, AND OF 2-AZODIISOBUTRONITRILE AND DIAZOAMINOBENZENE.
Claim 2
Independent Claim
110 words
THE METHOD OF PREPARING AN AUXILLIARY SUSPENDING AGENT SUITABLE FOR EMPLOYMENT IN THE SUSPENSION-POLYMERIZATION OF VINYL CHLORIDE, COMPRISING REFLUXING A MIXTURE OF FROM 70 TO 97 PARATS BY WEIGHT OF VINYL ACETATE AND 3 TO 30 PARTS BY WEIGHT OF ALLYL ALCOHOL IN 25 TO 400 PARTS OF WATER CONTAINING AN ORGANIC POLYMERIC SUSPENDING AGENT, SAID REFLUXING CARRIED OUT FOR A PERIOD OF FROM 18 TO 48 HOURS IN A TEMPERATURE RANGE OF 40*C. TO 67*C. AND AT ATMOSPHERIC PRESSURE, SAID REFLEXING CARRIED OUT IN THE PRESENCE OF A POLYMERIZATION CATALYST SELECTED FROM THE GROUP CONSISTING OF: HYDROGEN, LAUROYL, BENZOYL, TOTYL, ACETYL, AND PROPIONYL PEROXIDE, AND OF 2-AZODIISOBUTRONITRILE AND DIAZOAMINOBENZENE.
References Cited (Backward Citations)
US2917494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-08-13 | 1966-02-12 | 1966-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-08-13 | 1970-02-12 | 1970-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-08-13 | 1974-02-12 | 1974-08-14 | $7700.00 | Window Closed / Lapsed |