US4459402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters comprising repeating units from trans-4,4'-stilbenedicarboxylic acid, terephthalic acid and/or 2,6-naphthalenedicarboxylic acid, and 1,4-butanediol
Assignee: Eastman Chemical Co
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Filing: 1983-03-15
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Granted: 1984-07-10
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Expires: 2003-03-15
Abstract
Abstract The polyesters of trans-4,4'-stilbenedicarboxylic acid and 1,4-butanediol modified with 20 to 80 mol % terephthalic acid and/or 20 to 80 mol % of 2,6-naphthalenedicarboxylic acid can be injection-molded to give plastics, extruded into films or spun into fibers to give shaped objects with high strength.
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:03
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A copolyester comprising repeating units prepared from about 80 to about 20 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, and repeating units prepared from about 80 to about 20 mol % terephthalic acid, or about 80 to about 20 mol % 2,6-naphthalenedicarboxylic acid or esters thereof and repeating units prepared from 1,4-butanediol, said copolyester having an inherent viscosity of about 0.3 or more determined at 25° C. in 60/40 (wt./wt.) phenol/tetrachloroethane (PTCE) at a concentration of 0.5 g./100 mL and said copolyester when injection molded into 1/16 inch tensile bars exhibits a tensile strength of at least 20,000 psi.
Claim 2
Dependent Claim
99 words
A copolyester comprising repeating units prepared from about 80 to about 20 mol % trans-4,4'-stilbenedicarboxylic acid or esters thereof, and repeating units prepared from about 80 to about 20 mol % terephthalic acid, or about 80 to about 20 mol % 2,6-naphthalenedicarboxylic acid or esters thereof and repeating units prepared from 1,4-butanediol, said copolyester having an inherent viscosity of about 0.3 or more determined at 25° C. in 60/40 (wt./wt.) phenol/tetrachloroethane (PTCE) at a concentration of 0.5 g./100 mL and said copolyester when injection molded into 1/16 inch tensile bars exhibits a tensile strength of at least 20,000 psi.
Claim 3
Dependent Claim
50 words
Copolyester of claim 1 wherein the repeating units from the terephthalic acid portion of the polyester are present in the amount of 70 to 20 mol % and the repeating units from the 2,6-naphthlenedicarboxylic acid portion of the polyester are present in the amount of 80 to 20 mol %.
Claim 4
Dependent Claim
29 words
Copolyester of claim 1 wherein up to about 10 mol % of the repeating units of terephthalic acid or 2,6-naphthlenedicarboxylic acid are replaced with repeating units from isophthalic acid.
Claim 5
Dependent Claim
31 words
Copolyester of claim 1 wherein the terephthalic acid repeating units are from substituted terephthalic acid repeating units selected from 2-chloro, 2,5-dichloro, 2-methyl, 2-ethyl, 2-propyl, or 2,5-dimethyl terephthalic acid or esters thereof.
Claim 6
Dependent Claim
31 words
Copolyesters of claim 1 wherein repeating units from said 1,4-butanediol are replaced with up to about 10 mol % of repeating units from another glycol having 2 to 8 carbon atoms.
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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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |