US4440922A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester containers having improved gas barrier properties
Assignee: Eastman Chemical Co
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Filing: 1983-04-13
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Granted: 1984-04-03
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Expires: 2003-04-13
Abstract
Abstract The present invention provides 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 100 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 0 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
2026-10-22 19:52
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
92 words
A container having improved gas barrier properties consisting essentially of a substantially thermoplastic polyester which consists essentially of the reaction product of (A) a diol containing up to about 8 carbon atoms, and (B) a diacid component consisting essentially of (i) about 5 to 100 mole percent of a first diacid selected from the group consisting of 1,4-phenylenedioxy diacetic acid, 1,3-phenylenedioxy diacetic acid, 1,2-phenylenedioxy diacetic acid, and mixtures thereof, and (ii) 0 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
92 words
A container having improved gas barrier properties consisting essentially of a substantially thermoplastic polyester which consists essentially of the reaction product of (A) a diol containing up to about 8 carbon atoms, and (B) a diacid component consisting essentially of (i) about 5 to 100 mole percent of a first diacid selected from the group consisting of 1,4-phenylenedioxy diacetic acid, 1,3-phenylenedioxy diacetic acid, 1,2-phenylenedioxy diacetic acid, and mixtures thereof, and (ii) 0 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 container 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 container of claim 1 wherein said diol comprises ethylene glycol.
Claim 5
Dependent Claim
13 words
The container of claim 1 wherein said first diacid comprises 1,3-phenylenedioxy diacetic acid.
Claim 6
Dependent Claim
12 words
The container of claim 1 wherein said container is a molded container.
Claim 7
Dependent Claim
22 words
The molded container of claim 5 wherein said first diacid is present in a concentration of about 5 to 20 mole percent.
Claim 8
Dependent Claim
15 words
The container of claim 1 wherein said container is in the form of a film.
Claim 9
Dependent Claim
21 words
The film of claim 7 wherein said first diacid is present in a concentration of about 15 to 100 mole percent.
Claim 10
Dependent Claim
12 words
The container of claim 1 wherein said container is a coextruded article.
Claim 11
Dependent Claim
22 words
The coextruded article of claim 9 wherein said first diacid is present in a concentration of about 50 to 100 mole percent.
References Cited (Backward Citations)
US2470651A
Cited
US3522328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-03 | 1987-10-03 | 1988-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-03 | 1991-10-03 | 1992-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-03 | 1995-10-03 | 1996-04-03 | $7700.00 | Window Closed / Lapsed |