US4093603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters of terephthalic acid, 1,2-propanediol and 1,4-cyclohexanedimethanol
Assignee: Eastman Chemical Co
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Filing: 1977-01-19
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Granted: 1978-06-06
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Expires: 1997-01-19
Abstract
Abstract Copolyesters of terephthalic acid, 1,2-propanediol and 1,4-cyclohexanedimethanol are useful for film, blown bottle, and plastic applications.
Inventors
- 👤 Winston J. Jackson, Jr.
- 👤 Herbert F. Kuhfuss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
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
78 words
A composition comprising a copolyester of Components 1, 2 and 3 as follows: 1. terephthalic acid or derivatives thereof; 2. from about 30 to about 75 mole percent of 1,4-cyclohexanedimethanol; and 3. from 70 to 25 mole percent of 1,2-propanediol; said copolyester having an inherent viscosity of at least about 0.40 as measured at 25° C. using 0.5 gram of polyester per 100 ml. of a solvent consisting of 60% by volume phenol and 40% by volume tetrachloroethane.
Claim 2
Dependent Claim
78 words
A composition comprising a copolyester of Components 1, 2 and 3 as follows: 1. terephthalic acid or derivatives thereof; 2. from about 30 to about 75 mole percent of 1,4-cyclohexanedimethanol; and 3. from 70 to 25 mole percent of 1,2-propanediol; said copolyester having an inherent viscosity of at least about 0.40 as measured at 25° C. using 0.5 gram of polyester per 100 ml. of a solvent consisting of 60% by volume phenol and 40% by volume tetrachloroethane.
Claim 3
Dependent Claim
31 words
The composition of claim 1 wherein the mole percent of 1,4-cyclohexanedimethanol is from about 40 to about 70, and the mole percent of 1,2-propanediol is from about 60 to about 30.
Claim 4
Dependent Claim
14 words
The composition of claim 2 wherein the inherent viscosity is at least about 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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |