Patent US3376272A successfully refreshed from Google Patents.
US3376272A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resins
Assignee: Celanese Coatings Co
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Filing: 1965-09-20
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Granted: 1968-04-02
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Expires: 1985-09-20
Abstract
No abstract record available.
Inventors
- 👤 John E Masters
- 👤 Darrell D Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:42
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/56; C08G63/58; C08G63/40; C08G63/42; C08G63/66; C08G63/668; C08L; C08L67/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
193 words
IN THE PREPARATION OF THERMOPLASTIC POLYESTERS FROM DICARBOXYLIC ACID ANHYDRIDES AND MONOEPOXIDES, THE PROCESS FOR PREPARING BRANCH CHAIN POLYESTERS HAVING END GROUPS WHICH DO NOT REACT WITH EACH OTHER DURING PREPARATION, COMPRISING AS ALCOHOLIC COMPOUND WHICH REACTS AS AN INITIATOR AND IS SELECTED FROM THE GROUP CONSISTING OF POLYMRS OR COPOLYMERS HAVING A MOLECULAR WEIGHT IN EXCESS FROM ABOUT 1400 AND CONTAINING AT LEAST THREE HYDROXYL RADICAL SUBSTITUENTS, THE NUMBER OF SUBSTITUENTS BEING EQUAL TO THE NUMBER OF BRANCH CHAINS DESIRED, REACTING THE INITIATOR, THE ANHYDRIDE AND THE MONOEPOXIDE BY HEATING THE REACTANTS AT AN ELEVATED TEMPERATURE BELOW 150*C. SUFFICIENT TO BRING ABOUT A REACTION OF THE ANHYDRIDE WITH THE ALCOHOLIC HYDROXY GROUPS FORMING CARBOXYL GROUPS, AS WELL AS THE REACTION OF MONOEPOXIDE WITH THE CARBOXYL GROUPS FORMING ADDITIONAL ALCOHOLIC HYDROXYL GROUPS AND MAINTAINING THE TEMPERATURE BELOW THAT AT WHICH A CARBOXYTAINING THE TEMPERATURE BELOW THAT AT HYDROXY REACTION TAKES PLACE SO THAT THE END GROUPS OF POLYESTER CHAINS GROWING BY THE SUCCESSIVE ADDITION OF ANHYDRIDE AND MONOEPOXIDE TO THE INITIATOR, DO NOT REACT WITH EACH OTHER AND FORM WATER, SAID MONOEPOXIDE BEING FREE OF SUBSTITUENTS CAPABLE OF REACTING WITH AN ACID ANHYDRIDE.
Claim 2
Dependent Claim
193 words
IN THE PREPARATION OF THERMOPLASTIC POLYESTERS FROM DICARBOXYLIC ACID ANHYDRIDES AND MONOEPOXIDES, THE PROCESS FOR PREPARING BRANCH CHAIN POLYESTERS HAVING END GROUPS WHICH DO NOT REACT WITH EACH OTHER DURING PREPARATION, COMPRISING AS ALCOHOLIC COMPOUND WHICH REACTS AS AN INITIATOR AND IS SELECTED FROM THE GROUP CONSISTING OF POLYMRS OR COPOLYMERS HAVING A MOLECULAR WEIGHT IN EXCESS FROM ABOUT 1400 AND CONTAINING AT LEAST THREE HYDROXYL RADICAL SUBSTITUENTS, THE NUMBER OF SUBSTITUENTS BEING EQUAL TO THE NUMBER OF BRANCH CHAINS DESIRED, REACTING THE INITIATOR, THE ANHYDRIDE AND THE MONOEPOXIDE BY HEATING THE REACTANTS AT AN ELEVATED TEMPERATURE BELOW 150*C. SUFFICIENT TO BRING ABOUT A REACTION OF THE ANHYDRIDE WITH THE ALCOHOLIC HYDROXY GROUPS FORMING CARBOXYL GROUPS, AS WELL AS THE REACTION OF MONOEPOXIDE WITH THE CARBOXYL GROUPS FORMING ADDITIONAL ALCOHOLIC HYDROXYL GROUPS AND MAINTAINING THE TEMPERATURE BELOW THAT AT WHICH A CARBOXYTAINING THE TEMPERATURE BELOW THAT AT HYDROXY REACTION TAKES PLACE SO THAT THE END GROUPS OF POLYESTER CHAINS GROWING BY THE SUCCESSIVE ADDITION OF ANHYDRIDE AND MONOEPOXIDE TO THE INITIATOR, DO NOT REACT WITH EACH OTHER AND FORM WATER, SAID MONOEPOXIDE BEING FREE OF SUBSTITUENTS CAPABLE OF REACTING WITH AN ACID ANHYDRIDE.
References Cited (Backward Citations)
US2779783A
Cited
US3809863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-02 | 1971-10-02 | 1972-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-02 | 1975-10-02 | 1976-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-02 | 1979-10-02 | 1980-04-02 | $7700.00 | Window Closed / Lapsed |