US4287325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters derived from aromatic polyesters and glycol polyesters
Assignee: Eastman Chemical Co
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Filing: 1979-12-26
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Granted: 1981-09-01
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Expires: 1999-12-26
Abstract
Abstract Thermoplastic copolyester compositions prepared from combination of a bisphenol A polyester and a copolyester of poly(ethylene terephthalate) modified with 1,4-cyclohexanedimethanol. The compositions are characterized by excellent melt processability, high impact strength, and flexural modulus that is higher than that of either of the polymers used in the preparation of the thermoplastic copolyester compositions.
Inventors
- 👤 Winston J. Jackson, Jr.
- 👤 Herbert F. Kuhfuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:24
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
48 words
Copolyesters prepared from 50 to 80 weight percent of an aromatic polyester derived from 20-80 mole percent terephthalic acid, 80-20 mole percent isophthalic acid and 4,4'-isopropylidenediphenol; and 50-20 weight percent of a glycol polyester derived from terephthalic acid, 50-80 mole percent ethylene glycol, and 50-20 mole percent 1,4-cyclohexanedimethanol.
Claim 2
Dependent Claim
48 words
Copolyesters prepared from 50 to 80 weight percent of an aromatic polyester derived from 20-80 mole percent terephthalic acid, 80-20 mole percent isophthalic acid and 4,4'-isopropylidenediphenol; and 50-20 weight percent of a glycol polyester derived from terephthalic acid, 50-80 mole percent ethylene glycol, and 50-20 mole percent 1,4-cyclohexanedimethanol.
Claim 3
Dependent Claim
20 words
Composition of claim 1 wherein the glycol copolyester is present in the amount of about 30 to 40 weight percent.
Claim 4
Dependent Claim
8 words
Shaped object of the composition of claim 1.
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) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |