US4182842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(ester-amides)prepared from an aromatic dicarboxylic acid, ethylene glycol and a p-acylaminobenzoic acid
Assignee: Eastman Chemical Co
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Filing: 1978-11-03
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Granted: 1980-01-08
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Expires: 1998-11-03
Abstract
Abstract Disclosed are poly(ester-amides) prepared from an aromatic dicarboxylic acid, ethylene glycol and a p-acylaminobenzoic acid. These poly(ester-amides) contain the following divalent radicals: ##STR1##
Inventors
- 👤 Winston J. Jackson
- 👤 Herbert F. Kuhfuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:52
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
149 words
A process comprising (1) preparing a fragmented poly(ester-amide) by contacting within a temperature range of about 250° to about 300° C. (A) a starting polyester having an inherent viscosity of at least about 0.2 comprised of divalent radicals corresponding to the formula ##STR19## wherein ##STR20## wherein X is Cl--, Br--, or a monovalent alkyl radical having one to three carbon atoms and n is 0, 1 or 2, and (B) from about 10 to about 35 mole percent, based on the total moles of p-acylaminobenzoic acid and ##STR21## combined, a p-acylaminobenzoic acid corresponding to the formula ##STR22## wherein R 2 is phenyl or a monovalent alkyl radical of 1 to 8 carbon atoms, and (2) preparing a final poly(ester-amide) having an inherent viscosity of at least 0.4 by increasing the inherent viscosity of the fragmented polyester by exposing the fragmented polyester to a suitable pressure and a suitable temperature.
Claim 2
Dependent Claim
149 words
A process comprising (1) preparing a fragmented poly(ester-amide) by contacting within a temperature range of about 250° to about 300° C. (A) a starting polyester having an inherent viscosity of at least about 0.2 comprised of divalent radicals corresponding to the formula ##STR19## wherein ##STR20## wherein X is Cl--, Br--, or a monovalent alkyl radical having one to three carbon atoms and n is 0, 1 or 2, and (B) from about 10 to about 35 mole percent, based on the total moles of p-acylaminobenzoic acid and ##STR21## combined, a p-acylaminobenzoic acid corresponding to the formula ##STR22## wherein R 2 is phenyl or a monovalent alkyl radical of 1 to 8 carbon atoms, and (2) preparing a final poly(ester-amide) having an inherent viscosity of at least 0.4 by increasing the inherent viscosity of the fragmented polyester by exposing the fragmented polyester to a suitable pressure and a suitable temperature.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein ##STR23## the range of p-acylaminobenzoic acid is 25 to 30 mole percent, and R 2 is a monovalent alkyl radical having 1 to 4 carbon atoms.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein step (1) is conducted within a temperature range of 270° C. to 280° C.
Claim 5
Dependent Claim
7 words
The process of claim 3 wherein ##STR24##
Claim 6
Dependent Claim
7 words
Product of the process of claim 1.
Claim 7
Dependent Claim
7 words
Product of the process of claim 2.
Claim 8
Dependent Claim
7 words
Product of the process of claim 3.
Claim 9
Dependent Claim
7 words
Product of the process of claim 4.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-07 | 1983-07-09 | 1984-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-07 | 1987-07-09 | 1988-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-07 | 1991-07-09 | 1992-01-08 | $7700.00 | Window Closed / Lapsed |