US4841012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyesters with improved gas barrier properties
Assignee: Eastman Chemical Co
•
Filing: 1988-08-25
•
Granted: 1989-06-20
•
Expires: 2008-08-25
Abstract
Abstract Polyester resins useful for forming containers having improved resistance to gas permeability comprising the reaction product of (A) a dicarboxylic acid corresponding to the structure ##STR1## and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butane diol and 1,4-cyclohexanedimethanol.
Inventors
- 👤 Robert B. Barbee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:23
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
A polyester having an inherent viscosity of at least 0.5 measured at 25° 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 ##STR3## and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butane diol and 1,4-cyclohexanedimethanol.
Claim 2
Dependent Claim
60 words
A polyester having an inherent viscosity of at least 0.5 measured at 25° 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 ##STR3## and (B) a diol selected from the group consisting of ethylene glycol, 1,4-butane diol and 1,4-cyclohexanedimethanol.
Claim 3
Dependent Claim
11 words
The polyester of claim 1 wherein the diol 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)
US4110315A
Cited
US4307060A
Cited
US4510295A
Cited
US4440922A
Cited
US4426512A
Cited
US4482695A
Cited
US4501879A
Cited
US4546170A
Cited
US4552948A
Cited
US4663426A
Cited
US4560741A
Cited
US4574148A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-19 | 1992-12-19 | 1993-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-19 | 1996-12-19 | 1997-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-19 | 2000-12-19 | 2001-06-20 | $7700.00 | Window Closed / Lapsed |