Patent US2844570A successfully refreshed from Google Patents.
US2844570A
Expired / Lapsed
US
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Production of highly hydroxyalkylated polyvinyl alcohols
Assignee: Union Carbide Corp
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Filing: 1953-11-17
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Granted: 1958-07-22
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Expires: 1973-11-17
Abstract
No abstract record available.
Inventors
- 👤 Broderick Aubrey Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:05
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
PROCESS FOR MAKING WATER-SOLUBLE HYDROXYALKYL ETHERS OF POLYVINYL ALCOHOLS WHICH ARE SOLUBLE IN DIOXANE, WHICH COMPRISES REACTING AT TEMPERATURES WITHIN THE RANGE BETWEEN ABOUT 10*C. AND ABOUT 45*C. AN ALKYLENE OXIDE HAVING 2 TO 3 CARBON ATOMS WITH A POLYVINYL ALCOHOL IN THE RATIO OF AT LEAST ABOUT 4 PARTS BY WEIGHT OF THE ALKYLENE OXIDE PER PART BY WEIGHT OF THE POLYVINYL ALCOHOL, WHILE DISPERSED IN A VOLATILE ORGANIC LIQUID WHICH IS A SOLVENT FOR THE RESULTANT HYDROXYALKYLATED PRODUCT, IN THE PRESENCE OF AN INORGANIC ALKALINE CONDENSATION CATALYST, NEUTRALIZING THE RESULTANT REACTION MIXTURE, AND RECOVERING THEREFROM THE HYDROXYALKYL POLYVINYL ALCOHOL.
Claim 2
Dependent Claim
101 words
PROCESS FOR MAKING WATER-SOLUBLE HYDROXYALKYL ETHERS OF POLYVINYL ALCOHOLS WHICH ARE SOLUBLE IN DIOXANE, WHICH COMPRISES REACTING AT TEMPERATURES WITHIN THE RANGE BETWEEN ABOUT 10*C. AND ABOUT 45*C. AN ALKYLENE OXIDE HAVING 2 TO 3 CARBON ATOMS WITH A POLYVINYL ALCOHOL IN THE RATIO OF AT LEAST ABOUT 4 PARTS BY WEIGHT OF THE ALKYLENE OXIDE PER PART BY WEIGHT OF THE POLYVINYL ALCOHOL, WHILE DISPERSED IN A VOLATILE ORGANIC LIQUID WHICH IS A SOLVENT FOR THE RESULTANT HYDROXYALKYLATED PRODUCT, IN THE PRESENCE OF AN INORGANIC ALKALINE CONDENSATION CATALYST, NEUTRALIZING THE RESULTANT REACTION MIXTURE, AND RECOVERING THEREFROM THE HYDROXYALKYL POLYVINYL ALCOHOL.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |