US4414382A
Expired / Lapsed
US
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Copolyesters derived from 2,6-naphthalenedicarboxylic acid, trans-4,4'-stilbenedicarboxylic acid and ethylene glycol
Assignee: Eastman Chemical Co
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Filing: 1982-09-30
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Granted: 1983-11-08
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Expires: 2002-09-30
Abstract
Abstract Copolyesters of poly(ethylene 2,6-naphthalenedicarboxylate) modified with about 15 to 45 mol % trans-4,4'-stilbenedicarboxylic acid can be injection molded to give polymers with tensile strengths up to 32,000 psi and moduli up to 1,250,000 psi. As-spun or drawn fibers and films of poly(ethylene 2,6-naphthalenedicarboxylate) modified with as little as 10 mol % trans-4,4'-stilbenedicarboxylic acid have improved modulus compared with unmodified poly(ethylene 2,6-naphthalenedicarboxylate). The copolyesters have properties superior to those of poly(ethylene terephthalate).
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:14
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
71 words
A copolyester containing repeating units prepared from about 90 to about 55 mol % 2,6-naphthalenedicarboxylic acid or esters thereof, about 10 to about 45 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof and ethylene glycol, said copolyester having a melting point of about 350° C. or less and an inherent viscosity of about 0.4 or more determined at 25° C. in 40/35/25 (wt/wt/wt) p-chlorophenol/tetrachloroethane/phenol (PCLOL) at a concentration of 0.1 g/100 mL.
Claim 2
Dependent Claim
71 words
A copolyester containing repeating units prepared from about 90 to about 55 mol % 2,6-naphthalenedicarboxylic acid or esters thereof, about 10 to about 45 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof and ethylene glycol, said copolyester having a melting point of about 350° C. or less and an inherent viscosity of about 0.4 or more determined at 25° C. in 40/35/25 (wt/wt/wt) p-chlorophenol/tetrachloroethane/phenol (PCLOL) at a concentration of 0.1 g/100 mL.
Claim 3
Dependent Claim
49 words
A copolyester of claim 1 wherein up to about 15 mol % of the repeating units prepared from the 2,6-naphthalenedicarboxylic acid or esters thereof are replaced by repeating units prepared from other isomeric naphthalenedicarboxylic acids, methyl-, chloro-, or phenyl substituted naphthalenedicarboxylic acids, other aromatic dicarboxylic acids, or esters thereof.
Claim 4
Dependent Claim
40 words
Copolyester of claim 1 wherein up to about 15 mol % of the repeating units prepared from the trans-4,4'-stilbenedicarboxylic acid or esters thereof are replaced with up to about 15 mol % of other isomeric stilbenedicarboxylic acids or esters thereof.
Claim 5
Dependent Claim
34 words
Copolyester of claim 1 wherein up to about 15 mol % of the repeating units prepared from ethylene glycol are replaced by repeating units prepared from another glycol containing 3 to 20 carbon atoms.
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) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |