US4739033A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters of trans-4,4'-stilbenedicarboxylic acid, 1,4-butanediol and 1,6-hexanediol
Assignee: EIDP Inc
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Filing: 1987-01-02
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Granted: 1988-04-19
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Expires: 2007-01-02
Abstract
Abstract The polyesters of trans-4,4'-stilbenedicarboxylic acid, 5-95 mol % 1,4-butanediol, and 95-5 mol % 1,6-hexanediol can be injection-molded to give shaped objects having exceptionally high tensile strength and stiffness. Many of the copolyesters of this invention have excellent chemical resistance and good hydrolytic stability. The copolyesters can be injection-molded, spun into fiber, or extruded into film 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 12:06
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
71 words
A copolyester comprising repeating units from at least 80 mol % trans-4,4'-stilbenedicarboxylic acid, repeating units from about 5-95 mol % 1,4-butanediol and repeating units from about 95-5 mol % 1,6-hexanediol, 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
71 words
A copolyester comprising repeating units from at least 80 mol % trans-4,4'-stilbenedicarboxylic acid, repeating units from about 5-95 mol % 1,4-butanediol and repeating units from about 95-5 mol % 1,6-hexanediol, 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)
US4459402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-19 | 1991-10-19 | 1992-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-19 | 1995-10-19 | 1996-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-19 | 1999-10-19 | 2000-04-19 | $7700.00 | Window Closed / Lapsed |