Patent US3884854A successfully refreshed from Google Patents.
US3884854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyethylene terephthalate of improved color
Assignee: Arkema Inc
•
Filing: 1969-06-16
•
Granted: 1975-05-20
•
Expires: 1989-06-16
Abstract
Abstract A process for preparing polyethylene terephthalate wherein dimethyl terephthalate is reacted with ethylene glycol to form an ester of ethylene glycol and dimethyl terephthalate or where terephthalic acid is reacted with ethylene glycol to form an ester of terephthalic acid and ethylene glycol where the resulting ester is polycondensed in the presence of a polycondensation catalyst, the improvement comprising carrying out the condensation or polymerization of the ester in the presence of a catalytic amount of a novel catalyst mixture comprising (1) an antimony compound and (2) an arsenic compound.
Inventors
- 👤 John J Ventura
- 👤 Philip H Ravenscroft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
90 words
A PROCESS FOR PREPARING POLYETHYLENE TEREPHTHALATE OF IMPROVED COLOR, AS DETERMINED BY THE DIFFERENCE BETWEEN THE LUMINANCE VALUE AND YELLOWNESS INDEX OF THE POLYMER, WHEREIN DIMETHYL TEREPHTHALATE IS REACTED WITH ETHYLENE GLYCOL TO FORM AN ESTER OF ETHYLENE GLYCOL AND TEREPHTHALIC ACID OR WHERE TEREPHATHALIC ACID IS REACTED WITH ETHYLENE GLYCOL TO FORM AN ESTER OF TEREPHATHALIC ACID AND ETHYLENE GLYCOL WHEREIN THE RESULTING ESTER IS POLYCONDENSED IN THE PRESENCE OF A CATALYTIC AMOUNT OF A POLYCONDENSATION CATALYST CONSISTING OF A. AN ANTIMONY COMPOUND HAVING ONE OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
90 words
A PROCESS FOR PREPARING POLYETHYLENE TEREPHTHALATE OF IMPROVED COLOR, AS DETERMINED BY THE DIFFERENCE BETWEEN THE LUMINANCE VALUE AND YELLOWNESS INDEX OF THE POLYMER, WHEREIN DIMETHYL TEREPHTHALATE IS REACTED WITH ETHYLENE GLYCOL TO FORM AN ESTER OF ETHYLENE GLYCOL AND TEREPHTHALIC ACID OR WHERE TEREPHATHALIC ACID IS REACTED WITH ETHYLENE GLYCOL TO FORM AN ESTER OF TEREPHATHALIC ACID AND ETHYLENE GLYCOL WHEREIN THE RESULTING ESTER IS POLYCONDENSED IN THE PRESENCE OF A CATALYTIC AMOUNT OF A POLYCONDENSATION CATALYST CONSISTING OF A. AN ANTIMONY COMPOUND HAVING ONE OF THE FOLLOWING FORMULAE:
Claim 3
Dependent Claim
17 words
A process as described in claim 1 wherein the antimony compound exhibits the formula Sb(OR)n or Sb(OOCR)n.
Claim 4
Dependent Claim
17 words
A processs as described in claim 2 wherein the antimony compound is antimony triacetate or antimony tritallate.
Claim 5
Dependent Claim
14 words
A process as described in claim 2 wherein the antimony compound is antimony tributoxide.
Claim 6
Dependent Claim
17 words
A process as described in claim 1 wherein the arsenic compound is arsenic trioxide or arsenic pentoxide.
Claim 7
Dependent Claim
17 words
A process as described in claim 1 wherein the arsenic compound exhibits the formula As(OOCR)n or As(OR)n.
Claim 8
Dependent Claim
19 words
A process as described in claim 6 wherein the arsenic compound is arsenic triacetate, arsenic tritallate or arsenic tristearate.
References Cited (Backward Citations)
US3346541A
Cited
US3321444A
Cited
US3412066A
Cited
US3408333A
Cited
US3415860A
Cited
US3425995A
Cited
US3457237A
Cited
US3438944A
Cited
US3438945A
Cited
US3509099A
Cited
US3428587A
Cited
US3451971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |