Patent US3907754A successfully refreshed from Google Patents.
US3907754A
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US
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Process and catalyst-inhibitor system for preparing synthetic linear polyester
Assignee: Eastman Kodak Co
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Filing: 1974-06-19
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Granted: 1975-09-23
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Expires: 1994-06-19
Abstract
Abstract Catalyst-inhibitor system for the polymerization of poly(ethylene terephthalate) having excellent properties for fabrication of fibers and films. The catalyst-inhibitor system comprises a combination of organic or inorganic salts of manganese and cobalt with acetyl triisopropyl titanate and a phosphate ester. This invention also is directed to an improved method of preparing synthetic linear polyesters utilizing the new catalyst-inhibitor system.
Inventors
- 👤 Ronald A Tershansy
- 👤 Nicholas C Russin
- 👤 Finley E Mcfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:01
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08G63/826; C08G63/85; C08G63/87
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
89 words
PROCESS OF PRODUCING POLYETHYLENE TEREPHTHALATE COMPRISING REACTING DIMETHYL TEREPHTHALATE AND ETHYLENE GLYCOL AT A TEMPERATURE SUFFICIENT TO EFFECT ESTER INTERCHARGE AND IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING A MIXTURE OF SALTS OF MANGANESE AND COBALT WITH ACETYL TRIISOPROPYL TITANATE, THE 000000MANGANESE SALTS BEING PRESENT IN THE AMOUNT OF 35-110 PPM MANGANESE SALTS BEING PRESENT IN HE AMOUNT OF 35-110 PPM CO AND THE ACETYL TRIISOPROPYL TITANATE BEING PRESENT IN THE AMOUNT OF 36-72 PPM TI, ALL PARTS BY WEIGHT BASED ON THE ACID FRACTION OF THE POLYESTER.
Claim 2
Dependent Claim
89 words
PROCESS OF PRODUCING POLYETHYLENE TEREPHTHALATE COMPRISING REACTING DIMETHYL TEREPHTHALATE AND ETHYLENE GLYCOL AT A TEMPERATURE SUFFICIENT TO EFFECT ESTER INTERCHARGE AND IN THE PRESENCE OF A CATALYST SYSTEM COMPRISING A MIXTURE OF SALTS OF MANGANESE AND COBALT WITH ACETYL TRIISOPROPYL TITANATE, THE 000000MANGANESE SALTS BEING PRESENT IN THE AMOUNT OF 35-110 PPM MANGANESE SALTS BEING PRESENT IN HE AMOUNT OF 35-110 PPM CO AND THE ACETYL TRIISOPROPYL TITANATE BEING PRESENT IN THE AMOUNT OF 36-72 PPM TI, ALL PARTS BY WEIGHT BASED ON THE ACID FRACTION OF THE POLYESTER.
Claim 3
Dependent Claim
21 words
Process of claim 1 wherein the said manganese salt is manganous benzoate tetrahydrate and the cobalt salt is cobaltous acetate tetrahydrate.
Claim 4
Dependent Claim
30 words
Process of claim 1 wherein a phosphate ester is added to the reaction product of the ester interchange and said reaction product is polycondensed, said phosphate ester having the formula
Claim 5
Dependent Claim
30 words
Process of claim 2 wherein a phosphate ester is added to the reaction product of the ester interchange and said reaction product is polycondensed, said phosphate ester having the formula
Claim 6
Dependent Claim
33 words
Process of claim 4 wherein n is about 1.8, R is hydrogen or octyl and the ratio of the number of R hydrogen atoms to the number of phosphorus atoms is about 0.35.
Claim 7
Dependent Claim
31 words
Process of claim 5 wherein said phosphate ester has a molecular weight of 771 and the composition is as follows: C 52.84%; H 9.98%; P 8.04%; and O 29.14% by weight.
References Cited (Backward Citations)
US2641592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |