Patent US4551520A successfully refreshed from Google Patents.
US4551520A
Expired / Lapsed
US
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Polyesters of trans-4,4-stilbenedicarboxylic acid, terephthalic acid and 1,4-cyclohexanedimethanol
Assignee: Eastman Chemical Co
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Filing: 1984-11-30
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Granted: 1985-11-05
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Expires: 2004-11-30
Abstract
Abstract The polyesters of 95 to 40 mol % terephthalic acid, 5 to 60 mol % trans-4,4'-stilbenedicarboxylic acid, and at least 60 mol % 1,4-cyclohexanedimethanol can be injection molded to give shaped objects having exceptionally high impact strength and good chemical resistance. In addition, the polyesters of this invention can be extruded into films, spun into fibers, or blown into bottles 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 20:48
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/52; C08G63/54; C08G63/553
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A polyester comprising repeating units from about 40 to about 95 mol % terephthalic acid, repeating units from about 5 to about 60 mol % trans-4,4'-stilbenedicarboxylic acid and repeating units from at least 60 mol % 1,4-cyclohexanedimethanol, said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 mL.
Claim 2
Dependent Claim
62 words
A polyester comprising repeating units from about 40 to about 95 mol % terephthalic acid, repeating units from about 5 to about 60 mol % trans-4,4'-stilbenedicarboxylic acid and repeating units from at least 60 mol % 1,4-cyclohexanedimethanol, said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 mL.
Claim 3
Dependent Claim
85 words
A polyester comprising repeating units from about 40 to about 95 mol % terephthalic acid, repeating units from about 5 to about 60 mol % trans-4,4'-stilbenedicarboxylic acid and repeating units from at least 60 mol % 1,4-cyclohexanedimethanol, said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 mL and said polyester, when injection molded, having a notched Izod impact strength at -40° C. of greater than 2.0 ft-lb/in. at -40° C.
Claim 4
Dependent Claim
85 words
A polyester comprising repeating units from about 40 to about 95 mol % terephthalic acid, repeating units from about 5 to about 60 mol % trans-4,4'-stilbenedicarboxylic acid and repeating units from at least 60 mol % 1,4-cyclohexanedimethanol, said polyester having an inherent viscosity of 0.3 or more determined at 25° C. in 60/40 (wt/wt) phenol/tetrachloroethane at a concentration of 0.5 g/100 mL and said polyester, when injection molded, having a notched Izod impact strength at -40° C. of greater than 2.0 ft-lb/in. at -40° C.
Claim 5
Dependent Claim
34 words
A polyester according to claim 1 wherein the terephthalic acid is present in an amount of about 50-90 mol % and the trans-4,4'-stilbenedicarboxylic acid is present in an amount of about 10-50 mol %.
Claim 6
Dependent Claim
30 words
A polyester according to claim 1 wherein the acid component comprises up to 30 mol % of at least one other aromatic dicarboxylic acid having 8 to 20 carbon atoms.
Claim 7
Dependent Claim
15 words
A copolyester according to claim 1 wherein said 1,4-cyclohexanedimethanol contains at least 70% trans isomer.
Claim 8
Dependent Claim
13 words
A copolyester according to claim 1 wherein the I.V. is greater than 0.6.
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) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |