US3036054A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyvinyl alcohol
Assignee: Airco Inc
•
Filing: 1958-02-03
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Granted: 1962-05-22
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Expires: 1978-02-03
Abstract
No abstract record available.
Inventors
- 👤 Ora L Wheeler
- 👤 Smyser Harold Diemer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:42
CPC Classifications
C; C08; C08F; C08F18/00; C08F18/02; C08F18/04; C08F18/08; C08F8/00; C08F8/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
THE PROCESS OF PREPARING POLYVINYL ALCOHOL WHICH COMPRISES SUSPENSION POLYMERIZING VINYL ACETATE IN AN AQUEOUS MEDIUM CONTAINING A PROTECTIVE COLLOID AS A SUSPENSION AGENT AT ABOUT THE REFLUX TEMPERATURE OF THE VINYL ACETATE REACTION MIXTURE IN ADMIXTURE WITH FROM ABOUT 0.0035 TO ABOUT 0.0055 PERCENT BY WEIGHT BASED ON THE WEIGHT OF VINYL ACETATE, OF ISOPROPYL PEROXYDICARBONATE TO EFFECT A CONVERSION OF VINYL ACETATE TO POLYVINYL ACETATE NOT ABOVE ABOUT 50 TO 75 PERCENT AND HYDROLYZING THE RESULTING POLYVINYL ACETATE UNTIL AT LEAST ABOUT 75 PERCENT OF THE ACETYL GROUPS OF THE POLYVINYL ACETATE HAS BEEN CONVERTED TO HYDROXYL GROUPS TO PRODUCE POLYVINYL ALCOHOL HAVING A VISCOSITY MEASURED IN A 4 PERCENT AQUEOUS SOLUTION AT 20*C. OF FROM 100 TO 300 CENTIPOISES.
Claim 2
Dependent Claim
122 words
THE PROCESS OF PREPARING POLYVINYL ALCOHOL WHICH COMPRISES SUSPENSION POLYMERIZING VINYL ACETATE IN AN AQUEOUS MEDIUM CONTAINING A PROTECTIVE COLLOID AS A SUSPENSION AGENT AT ABOUT THE REFLUX TEMPERATURE OF THE VINYL ACETATE REACTION MIXTURE IN ADMIXTURE WITH FROM ABOUT 0.0035 TO ABOUT 0.0055 PERCENT BY WEIGHT BASED ON THE WEIGHT OF VINYL ACETATE, OF ISOPROPYL PEROXYDICARBONATE TO EFFECT A CONVERSION OF VINYL ACETATE TO POLYVINYL ACETATE NOT ABOVE ABOUT 50 TO 75 PERCENT AND HYDROLYZING THE RESULTING POLYVINYL ACETATE UNTIL AT LEAST ABOUT 75 PERCENT OF THE ACETYL GROUPS OF THE POLYVINYL ACETATE HAS BEEN CONVERTED TO HYDROXYL GROUPS TO PRODUCE POLYVINYL ALCOHOL HAVING A VISCOSITY MEASURED IN A 4 PERCENT AQUEOUS SOLUTION AT 20*C. OF FROM 100 TO 300 CENTIPOISES.
References Cited (Backward Citations)
US2108857A
Cited
US2843576A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-21 | 1965-11-20 | 1966-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-21 | 1969-11-20 | 1970-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-21 | 1973-11-20 | 1974-05-22 | $7700.00 | Window Closed / Lapsed |