US4963641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester with improved gas barrier properties from cycloalkylidene bis (p-phenyleneoxy) diacetic acid
Assignee: Eastman Chemical Co
•
Filing: 1989-05-30
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Granted: 1990-10-16
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Expires: 2009-05-30
Abstract
Abstract Polyester resins usefurl for forming containers having improved resistance to gas permeability comprising the reaction product of (A) a dicarboxylic acid corresponding to the structure ##STR1## wherein X is hydrogen or unstubstituted alkyl containing 1-5 carbons and n is an integer in the range of 4 to 10, and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butanediol and 1,4-cyclohexanedimethanol.
Inventors
- 👤 Burns Davis, deceased
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
A polyester having an inherent viscosity of at least 0.5 measured at 25 degrees C. in a 60/40 by weight mixture of phenol/tetrachloroethane at a concentration of 0.5 g/100 mL. comprising the polyester reaction product of (A) a dicarboxylic acid corresponding to the structure ##STR4## wherein X is hydrogen or unsubstituted alkyl containing 1-5 carbons and n is an integer in the range of 4 to 10, and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butanediol and 1,4-cyclohexanedimethanol.
Claim 2
Dependent Claim
82 words
A polyester having an inherent viscosity of at least 0.5 measured at 25 degrees C. in a 60/40 by weight mixture of phenol/tetrachloroethane at a concentration of 0.5 g/100 mL. comprising the polyester reaction product of (A) a dicarboxylic acid corresponding to the structure ##STR4## wherein X is hydrogen or unsubstituted alkyl containing 1-5 carbons and n is an integer in the range of 4 to 10, and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butanediol and 1,4-cyclohexanedimethanol.
Claim 3
Dependent Claim
18 words
The polyester of claim 1 wherein X is hydrogen, n is 5, and the idol is ethylene glycol.
Claim 4
Dependent Claim
9 words
A container formed from the polyester of claim 1.
Claim 5
Dependent Claim
9 words
A film formed from the polyester of claim 1.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-10-15 | 1994-04-16 | 1994-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-15 | 1998-04-16 | 1998-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-15 | 2002-04-16 | 2002-10-16 | $7700.00 | Window Closed / Lapsed |