US3055870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters condensed in presence of pentavalent antimony compound as catalyst
Assignee: Imperial Chemical Industries Ltd
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Filing: 1960-02-01
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Granted: 1962-09-25
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Expires: 1980-02-01
Abstract
No abstract record available.
Inventors
- 👤 Mcintyre James Eric
- 👤 Maclean Duncan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:55
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/85; C08G63/86; C08G63/866
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
IN A PROCESS FOR THE MANUFACTURE OF FILAMENT AND FILM-FORMING POLYETHLENE TEREPHTHALATE BY ESTER-INTERCHANGING ETHYLENE GLYCOL WITH DIMETHYL TEREPHALATE IN THE PRESENCE OF 0.01-0.2% BY WEIGHT, BASED ON THE WEIGHT OF DIMETHYL TERPHTHALATE, OF AN ESTER-INTERCHARGE CATALYST SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM COMPOUNDS AT A TEMPERATURE FROM 150-235*C. AND THEN POLYCONDENSING THE ESTER-INTERCHARGE PRODUCT THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN ADDING TO THE ESTER-INTERCHANGE PRODUCT A TRIVALENT PHOSPHORUS COMPOUND IN AN AMOUNT UP TO THE STOICHIOMETERIC EQUIVALENT OF THE WEIGHT OF THE ESTER-INTERCHANGE CATALYST AND THEN POLYCONDENSING IN THE PRESENCE OF 0.005-0.1% BY WEIGHT, BASED ON THE WEIGHT OF DIMETHYL TEREPHALATE, OF A CATLYTIC PENTAVALENT ANITONY COMPOUND AT A TEMPERATURE OF 210-300*C.
Claim 2
Dependent Claim
116 words
IN A PROCESS FOR THE MANUFACTURE OF FILAMENT AND FILM-FORMING POLYETHLENE TEREPHTHALATE BY ESTER-INTERCHANGING ETHYLENE GLYCOL WITH DIMETHYL TEREPHALATE IN THE PRESENCE OF 0.01-0.2% BY WEIGHT, BASED ON THE WEIGHT OF DIMETHYL TERPHTHALATE, OF AN ESTER-INTERCHARGE CATALYST SELECTED FROM THE GROUP CONSISTING OF CALCIUM AND MAGNESIUM COMPOUNDS AT A TEMPERATURE FROM 150-235*C. AND THEN POLYCONDENSING THE ESTER-INTERCHARGE PRODUCT THE IMPROVEMENT WHICH CONSISTS ESSENTIALLY IN ADDING TO THE ESTER-INTERCHANGE PRODUCT A TRIVALENT PHOSPHORUS COMPOUND IN AN AMOUNT UP TO THE STOICHIOMETERIC EQUIVALENT OF THE WEIGHT OF THE ESTER-INTERCHANGE CATALYST AND THEN POLYCONDENSING IN THE PRESENCE OF 0.005-0.1% BY WEIGHT, BASED ON THE WEIGHT OF DIMETHYL TEREPHALATE, OF A CATLYTIC PENTAVALENT ANITONY COMPOUND AT A TEMPERATURE OF 210-300*C.
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) | 1965-09-24 | 1966-03-26 | 1966-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-24 | 1970-03-26 | 1970-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-24 | 1974-03-26 | 1974-09-25 | $7700.00 | Window Closed / Lapsed |