US4619976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blends of copolyesters and polycarbonate
Assignee: Eastman Chemical Co
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Filing: 1985-11-26
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Granted: 1986-10-28
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Expires: 2005-11-26
Abstract
Abstract Disclosed are blends of polyesters of terephthalic acid, trans-4,4'-stilbenedicarboxylic acid, and bisphenol A polycarbonate. The polymers are compatible, and blends prepared from these polymers have excellent impact strength and are useful as molding plastics, fibers, and films.
Inventors
- 👤 John C. Morris
- 👤 Winston J. Jackson, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:43
CPC Classifications
C; C08; C08L; C08L67/00; C08L67/06; C08L69/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
Composition of matter comprising (a) about 5-95% by weight of a polyester comprising repeating units from about 30 to about 95 mol % terephthalic acid, repeating units from about 5 to about 70 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 (b) about 95-5% by weight of a polycarbonate of 4,4'-isopropylidenediphenol with an inherent viscosity of at least 0.3.
Claim 2
Dependent Claim
91 words
Composition of matter comprising (a) about 5-95% by weight of a polyester comprising repeating units from about 30 to about 95 mol % terephthalic acid, repeating units from about 5 to about 70 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 (b) about 95-5% by weight of a polycarbonate of 4,4'-isopropylidenediphenol with an inherent viscosity of at least 0.3.
Claim 3
Dependent Claim
41 words
A composition according to claim 1 wherein the terephthalic acid repeating units of the polyester are present in an amount of about 40-95 mol % and the trans-4,4'-stilbenedicarboxylic repeating units acid are present in an amount of about 5-60 mol %.
Claim 4
Dependent Claim
36 words
A composition according to claim 1 wherein the acid component of the polyester comprises repeating units from up to 30 mol % of at least one other aromatic dicarboxylic acid having 8 to 20 carbon atoms.
Claim 5
Dependent Claim
15 words
A composition according to claim 1 wherein said 1,4-cyclohexanedimethanol contains at least 70% trans isomer.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 wherein the I.V. of the copolyester is greater than 0.6.
References Cited (Backward Citations)
US2657195A
Cited
US3218372A
Cited
US3496839A
Cited
US4124652A
Cited
US4391954A
Cited
US4226961A
Cited
US4367317A
Cited
US4420607A
Cited
US4459402A
Cited
US4468510A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |