US4728720A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of trans-4,4'-stilbenedicarboxylic acid, ethylene glycol, and 1,4-butanediol
Assignee: EIDP Inc
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Filing: 1987-01-02
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Granted: 1988-03-01
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Expires: 2007-01-02
Abstract
Abstract The polyesters of trans-4,4'-stilbenedicarboxylic acid, 95 to 60 mol % 1,4-butanediol, and 5 to 40 mol % ethylene glycol can be injection-molded to give shaped objects having exceptionally high heat resistance. Many of the polyesters also have excellent hydrolytic stability and chemical resistance. The polyesters of this invention can be molded, extruded into film, or spun into fibers having these properties.
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:41
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A copolyester comprising repeating units from at least 80 mol % trans-4,4'-stilbenedicarboxylic acid, repeating units from about 95-60 mol % 1,4-butanediol and repeating units from about 5-40 mol % ethylene glycol, the total mol % of acid components and glycol components each being 100 mol %, and said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 25/35/40 (wt/wt/wt) phenol/tetrachloroethane/p-chlorophenol at a concentration of 0.1 g/100 mL.
Claim 2
Dependent Claim
72 words
A copolyester comprising repeating units from at least 80 mol % trans-4,4'-stilbenedicarboxylic acid, repeating units from about 95-60 mol % 1,4-butanediol and repeating units from about 5-40 mol % ethylene glycol, the total mol % of acid components and glycol components each being 100 mol %, and said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 25/35/40 (wt/wt/wt) phenol/tetrachloroethane/p-chlorophenol at a concentration of 0.1 g/100 mL.
Claim 3
Dependent Claim
20 words
A copolyester according to claim 1 wherein the trans-4,4'-stilbenedicarboxylic acid is present in an amount of about 100 mol %.
Claim 4
Dependent Claim
30 words
A copolyester according to claim 1 wherein the acid component comprises up to 20 mol % of at least one other aromatic dicarboxylic acid having 8 to 20 carbon atoms.
Claim 5
Dependent Claim
13 words
A copolyester according to claim 1 wherein the I.V. is greater than 0.6.
Claim 6
Dependent Claim
8 words
A fiber comprising the copolyester of claim 1.
Claim 7
Dependent Claim
8 words
A film comprising the copolyester of claim 1.
Claim 8
Dependent Claim
9 words
A molded object comprising the copolyester of claim 1.
References Cited (Backward Citations)
US4414382A
Cited
US4459402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |