Patent US4426512A successfully refreshed from Google Patents.
US4426512A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyester containers having improved gas barrier properties
Assignee: Eastman Chemical Co
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Filing: 1983-06-09
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Granted: 1984-01-17
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Expires: 2003-06-09
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 60 mole percent of a first diacid selected from [thiobis(p-phenyleneoxy)]diacetic acid, [sulfonylbis(p-phenyleneoxy)]diacetic acid, and mixtures thereof, and about 40 to 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
2026-10-23 17:15
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G63/6886
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
92 words
A polyester consisting essentially of the reaction product of; (A) adiol containing up to about 8 carbon atoms, and (B) a diacid component comprising (i) about 5 to 60 mole percent of a first diacid selected from the group consisting of [thiobis(p-phenyleneoxy)] diacetic acid, [sulfonyl-bis(p-phenyleneoxy)] diacetic acid, and mixtures thereof, and (ii) about 40 to 95 mole percent of terephthalic acid, wherein said polyester has an inherent viscosity of about 0.5 to 1.5 when measured at 25° C. in a 60/40 by weight mixture of phenol/tetrachloroethane at a concentration of 0.5g/100 ml.
Claim 2
Dependent Claim
92 words
A polyester consisting essentially of the reaction product of; (A) adiol containing up to about 8 carbon atoms, and (B) a diacid component comprising (i) about 5 to 60 mole percent of a first diacid selected from the group consisting of [thiobis(p-phenyleneoxy)] diacetic acid, [sulfonyl-bis(p-phenyleneoxy)] diacetic acid, and mixtures thereof, and (ii) about 40 to 95 mole percent of terephthalic acid, wherein said polyester has an inherent viscosity of about 0.5 to 1.5 when measured at 25° C. in a 60/40 by weight mixture of phenol/tetrachloroethane at a concentration of 0.5g/100 ml.
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 1 wherein said diol comprises ethylene glycol.
Claim 5
Dependent Claim
12 words
The polyester of claim 1 wherein said first diacid comprises [thiobis(p-phenyleneoxy)]diacetic acid.
Claim 6
Dependent Claim
12 words
The polyester of claim 1 wherein said first diacid comprises [sulfonylbis(p-phenyleneoxy)]diacetic acid.
Claim 7
Dependent Claim
21 words
The polyester of claim 1 wherein said first diacid is present in a concentration of about 5 to 20 mole percent.
Claim 8
Dependent Claim
9 words
A container formed from the polyester of claim 1.
Claim 9
Dependent Claim
10 words
A molded container formed from the polyester of claim 1.
Claim 10
Dependent Claim
9 words
A film formed from the polyester of claim 1.
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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |