US4011196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized polyester resin and processes for making them
Assignee: FMC Corp
•
Filing: 1972-11-16
•
Granted: 1977-03-08
•
Expires: 1992-11-16
Abstract
Abstract Process of making a polyester resin using a zinc esterification catalyst and a hindered phenol stabilizer.
Inventors
- 👤 Frank E. Carevic
- 👤 Anthony Labriola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:13
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83; C08K; C08K3/00; C08K3/32; C08K5/00; C08K5/04; C08K5/13; C08K5/134; C08K5/1345; C08K5/49; C08K5/51; C08K5/52
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
205 words
A process for producing a fiber or film-forming polyester having improved resistance to deterioration by heat and moisture comprising polycondensing bis 2-hydroxy ethyl terephthalate formed by transesterification, or intermediate condensation products thereof, in the presence of a zinc organic acid salt transesterification catalyst, a phosphorus acid or ester thereof, and a stabilizing amount of a hindered phenol represented by the formula: ##STR10## in which R 1 and R 2 are lower alkyls of the group consisting of isopropyl, tertiary butyl and neopentyl, with R 1 in a position ortho to the hydroxyl group and R 2 in the other position ortho to the hydroxyl group or in the other position meta to the hydroxyl group and para to R 1 and in which a and a' each has a value of from 0 to 18 inclusive, b has a value of 0 or 1, d has a value of 0 or 1 and p has a value of 1 or 4, and in which when p has a value of 1, b has a value of 1 and d has a value of 0, and when p has a value of 4, b has a value of 0 and d has a value of 1.
Claim 2
Dependent Claim
205 words
A process for producing a fiber or film-forming polyester having improved resistance to deterioration by heat and moisture comprising polycondensing bis 2-hydroxy ethyl terephthalate formed by transesterification, or intermediate condensation products thereof, in the presence of a zinc organic acid salt transesterification catalyst, a phosphorus acid or ester thereof, and a stabilizing amount of a hindered phenol represented by the formula: ##STR10## in which R 1 and R 2 are lower alkyls of the group consisting of isopropyl, tertiary butyl and neopentyl, with R 1 in a position ortho to the hydroxyl group and R 2 in the other position ortho to the hydroxyl group or in the other position meta to the hydroxyl group and para to R 1 and in which a and a' each has a value of from 0 to 18 inclusive, b has a value of 0 or 1, d has a value of 0 or 1 and p has a value of 1 or 4, and in which when p has a value of 1, b has a value of 1 and d has a value of 0, and when p has a value of 4, b has a value of 0 and d has a value of 1.
Claim 3
Dependent Claim
67 words
The process of claim 1 wherein the hindered phenol is represented by the formula: ##STR11## in which R 1 and R 2 are each tertiary butyl, a' has a value of either 1 or 18, and in which when a' has a value of 1, p has a value of 4; and in which when a' has a value of 18, p has a value of 1.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the hindered phenol is: octadecyl-3-(3',5'-di-tertiary butyl-4' hydroxyphenyl) propionate
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the hindered phenol is: tetrakis [methylene 3-(3',5'-di-tertiary butyl-4'-hydroxy-phenyl) propionate] methane
References Cited (Backward Citations)
US2437232A
Cited
US3085003A
Cited
US3305484A
Cited
US3361846A
Cited
US3445504A
Cited
US3285855A
Cited
US3563949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |