US4552948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester resins capable of forming containers having improved gas barrier properties
Assignee: Eastman Chemical Co
•
Filing: 1985-03-29
•
Granted: 1985-11-12
•
Expires: 2005-03-29
Abstract
Abstract The present invention provides polyester resins useful for forming containers having improved resistance to gas permeability. The containers are formed from a polyester resin which comprises the reaction product of a diol containing up to about 8 carbon atoms and a diacid component which comprises about 5 to 50 mole percent of a first diacid selected from 1,4-phenylenedioxy diacetic acid, 1,3-phenylenedioxy diacetic acid, 1,2-phenylenedioxy diacetic acid, and mixtures thereof, and about 50 to about 95 mole percent of terephthalic acid. The polyester resin has an inherent viscosity of about 0.5 to 1.5. The containers which are provided by the present invention may be in the form of sheet, film, molded articles, such as bottles, and other such structures.
Inventors
- 👤 Robert B. Barbee
- 👤 Thomas H. Wicker, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:56
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
89 words
A polyester composition capable of being formed into molded containers having good gas barrier properties comprising the reaction product of (A) a diol containing up to about 8 carbon atoms, and (B) a diacid component comprising (i) about 5 to 50 mole percent of at least one first diacid selected from the group consisting of 1,4-phenylenedioxy diacetic acid, 1,3-phenylenedioxy diacetic acid and 1,2-phenylenedioxy diacetic acid, and, (ii) about 50 to about 95 mole percent of terephthalic acid, wherein said polyester has an inherent viscosity of about 0.5 to 1.5.
Claim 2
Dependent Claim
89 words
A polyester composition capable of being formed into molded containers having good gas barrier properties comprising the reaction product of (A) a diol containing up to about 8 carbon atoms, and (B) a diacid component comprising (i) about 5 to 50 mole percent of at least one first diacid selected from the group consisting of 1,4-phenylenedioxy diacetic acid, 1,3-phenylenedioxy diacetic acid and 1,2-phenylenedioxy diacetic acid, and, (ii) about 50 to about 95 mole percent of terephthalic acid, wherein said polyester has an inherent viscosity of about 0.5 to 1.5.
Claim 3
Dependent Claim
17 words
The polyester of claim 1 wherein said diol comprises ethylene glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, or a mixture thereof.
Claim 4
Dependent Claim
11 words
The polyester of claim 2 wherein said diol is ethylene glycol.
Claim 5
Dependent Claim
13 words
The polyester of claim 3 wherein said first diacid is 1,4-phenylenedioxy diacetic acid.
Claim 6
Dependent Claim
13 words
The polyester of claim 3 wherein said first diacid is 1,3-phenylenedioxy diacetic acid.
Claim 7
Dependent Claim
13 words
The polyester of claim 3 wherein said first diacid is 1,2-phenylenedioxy diacetic acid.
Claim 8
Dependent Claim
21 words
The polyester of claim 1 wherein said first diacid is present in a concentration of about 5 to 50 mole percent.
Claim 9
Dependent Claim
13 words
The polyester of claim 7 wherein said first diacid is 1,4-phenylenedioxy diacetic acid.
Claim 10
Dependent Claim
13 words
The polyester of claim 7 wherein said first diacid is 1,3-phenylenedioxy diacetic acid.
Claim 11
Dependent Claim
13 words
The polyester of claim 7 wherein said first diacid is 1,2-phenylenedioxy diacetic acid.
References Cited (Backward Citations)
US2470651A
Cited
US3522328A
Cited
US4330661A
Cited
US4307060A
Cited
US4384106A
Cited
US4440922A
Cited
US4426512A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-11 | 1989-05-13 | 1989-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-11 | 1993-05-13 | 1993-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-11 | 1997-05-13 | 1997-11-12 | $7700.00 | Window Closed / Lapsed |