Patent US2863854A successfully refreshed from Google Patents.
US2863854A
Expired / Lapsed
US
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Reducing acidity of polyesters by treatment with alkylene carbonate
Assignee: Hudson Foam Plastics Corp
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Filing: 1954-12-07
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Granted: 1958-12-09
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Expires: 1974-12-07
Abstract
No abstract record available.
Inventors
- 👤 Christopher L Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/42; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G63/52; C08G63/56; C08G63/58; C08G63/64; C08G63/66; C08G63/668; C08G63/78; C08G63/82
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD WHICH COMPRISES REACTING A POLYESTER HAVING A MOLECULAR WEIGHT OF AT LEAST APPROXIMATELY 1000 AND AN ACID NUMBER GREATER THAN ABOUT 16 AND LESS THAN ABOUT 49.5, SAID POLYESTER BEING PREDOMINANTLY THE PRODUCT OF ESTERIFICATION REACTION BETWEEN AN ORGANIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPHIC, AZELAIC, FUMARIC, SUCCINIC, PHTHALIC AND TEREPHTHALIC ACIDS AND A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, PROPYLENE GLYCOL AND DIPROPYLENE GLYCOL, WITH AN ALKYLENE CARBONATE IN AN AMOUNT RANGING FROM ABOUT 100% TO 268% OF THE TEORETICAL STOICHIOMETRIC AMOUNT FOR COMPLETELY REACTING WITH THE CARBOXYL GROUPS OF SAID POLYESTER AND AT A TEMPERATURE FROM APPROXIMATELY 200* C. TO APPROXIMATELY 250*C. THEREBY EFFECTING ESTERIFICATION OF THE CARBOXYLIC GROUPS WITH FORMATION OF HYDROXYALKYL ESTER GROUPS, AND CONTAINING SAID REACTION UNTIL THE ACID NUMBER OF THE POLYESTER IS REDUCED SUBSTANTIALLY BELOW 16 SAID REACTION BEING DISCOJTINUED WHILE LIMITED SUBSTANTIALLY TO SAID ESTERIFICATION.
Claim 2
Independent Claim
155 words
A METHOD WHICH COMPRISES REACTING A POLYESTER HAVING A MOLECULAR WEIGHT OF AT LEAST APPROXIMATELY 1000 AND AN ACID NUMBER GREATER THAN ABOUT 16 AND LESS THAN ABOUT 49.5, SAID POLYESTER BEING PREDOMINANTLY THE PRODUCT OF ESTERIFICATION REACTION BETWEEN AN ORGANIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ADIPHIC, AZELAIC, FUMARIC, SUCCINIC, PHTHALIC AND TEREPHTHALIC ACIDS AND A GLYCOL SELECTED FROM THE GROUP CONSISTING OF ETHYLENE GLYCOL, DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, PROPYLENE GLYCOL AND DIPROPYLENE GLYCOL, WITH AN ALKYLENE CARBONATE IN AN AMOUNT RANGING FROM ABOUT 100% TO 268% OF THE TEORETICAL STOICHIOMETRIC AMOUNT FOR COMPLETELY REACTING WITH THE CARBOXYL GROUPS OF SAID POLYESTER AND AT A TEMPERATURE FROM APPROXIMATELY 200* C. TO APPROXIMATELY 250*C. THEREBY EFFECTING ESTERIFICATION OF THE CARBOXYLIC GROUPS WITH FORMATION OF HYDROXYALKYL ESTER GROUPS, AND CONTAINING SAID REACTION UNTIL THE ACID NUMBER OF THE POLYESTER IS REDUCED SUBSTANTIALLY BELOW 16 SAID REACTION BEING DISCOJTINUED WHILE LIMITED SUBSTANTIALLY TO SAID ESTERIFICATION.
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) | 1961-12-08 | 1962-06-09 | 1962-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-08 | 1966-06-09 | 1966-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-08 | 1970-06-09 | 1970-12-09 | $7700.00 | Window Closed / Lapsed |