US2921051A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester film and process therefor
Assignee: EIDP Inc
•
Filing: 1953-09-30
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Granted: 1960-01-12
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Expires: 1973-09-30
Abstract
No abstract record available.
Inventors
- 👤 Amborski Leonard Edward
- 👤 Izard Emmette Farr
- 👤 Sroog Cyrus Efrem
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/87; C08G63/83; C08G63/85; C08G63/86; C08G63/866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
199 words
IN THE PROCESS OF MANUFACTURE OF HIGHLY PLOYMETRIC LINEAR TEREPHTHALIC ESTER FILM TO BE USED AS DIELECTRIC MATERIAL, WHEREIN AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING 1-7 CARBON ATOMS IN THE ALKYL GROUP IS REACTED UNDER ESTER INTERCHANGE CONDITIONS WITH A PLOYMETHYLENE GLYCOL HAVING FROM 2-10 CARBON ATOMS, THE RESULTING GYCOL TEREPHTHALATE IS POLYMERIZED IN THE PRESENCE OF AN ESTER INTERCHANGE-POLYMERIZATION CATALYST SYSTEM TO FORM THE LINEAR POLYESTER, AND FILM IS FORMED FROM SAID POLYESTER, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE CATALYST A SYSTEM (1) FROM 0.003% TO 0.01% BY WEIGHT BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF AN ALKALINE METAL-CONTAINING MATERIAL FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, CALCIUM, AND MAGNESIUM AND THEIR HYDRIDES, HYDROXIDES, ALCOHOLATES, CHLORIDES AND GLYCOL SOLUBLE SALTS OF MONOCARBOXYLIC ACIDS, (2) FROM 0.02% TO 0.05% BY WEIGHT, BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF A GLYCOLSOLUBLE SALT OF A MONOCARBOXYLIC ACID AND A METAL FROM THE GROUP CONSISTING OF ZINC AND CADMIUM? (3) FROM 0.02* TO 0.05% BY WEIGHT, BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF AN ANTIMONY COMPOUND FROM THE GROUP CONSISTING OF ANTIMONY TRIOXIDE, ANTIMONYL POTASSIUM TARTRATE, ANTIMONOUS OXYCHLORIDE.
Claim 2
Dependent Claim
199 words
IN THE PROCESS OF MANUFACTURE OF HIGHLY PLOYMETRIC LINEAR TEREPHTHALIC ESTER FILM TO BE USED AS DIELECTRIC MATERIAL, WHEREIN AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING 1-7 CARBON ATOMS IN THE ALKYL GROUP IS REACTED UNDER ESTER INTERCHANGE CONDITIONS WITH A PLOYMETHYLENE GLYCOL HAVING FROM 2-10 CARBON ATOMS, THE RESULTING GYCOL TEREPHTHALATE IS POLYMERIZED IN THE PRESENCE OF AN ESTER INTERCHANGE-POLYMERIZATION CATALYST SYSTEM TO FORM THE LINEAR POLYESTER, AND FILM IS FORMED FROM SAID POLYESTER, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE CATALYST A SYSTEM (1) FROM 0.003% TO 0.01% BY WEIGHT BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF AN ALKALINE METAL-CONTAINING MATERIAL FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, CALCIUM, AND MAGNESIUM AND THEIR HYDRIDES, HYDROXIDES, ALCOHOLATES, CHLORIDES AND GLYCOL SOLUBLE SALTS OF MONOCARBOXYLIC ACIDS, (2) FROM 0.02% TO 0.05% BY WEIGHT, BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF A GLYCOLSOLUBLE SALT OF A MONOCARBOXYLIC ACID AND A METAL FROM THE GROUP CONSISTING OF ZINC AND CADMIUM? (3) FROM 0.02* TO 0.05% BY WEIGHT, BASED ON THE WEIGHT OF ALKYL ESTER OF TEREPHTHALIC ACID, OF AN ANTIMONY COMPOUND FROM THE GROUP CONSISTING OF ANTIMONY TRIOXIDE, ANTIMONYL POTASSIUM TARTRATE, ANTIMONOUS OXYCHLORIDE.
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) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |