Patent US4474918A successfully refreshed from Google Patents.
US4474918A
Expired / Lapsed
US
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Thermoplastic polyester compositions having improved barrier properties
Assignee: Eastman Chemical Co
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Filing: 1983-05-31
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Granted: 1984-10-02
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Expires: 2003-05-31
Abstract
Abstract Disclosed are polyester compositions having special utility in film or sheet form having improved gas and water barrier properties, and comprising homo- or copolyesters derived from terephthalic acid or mixtures of terephthalic acid with acids such as isophthalic, 2,6-naphthalene dicarboxylic, and the like, and a glycol component such as ethylene glycol or 1,4-cyclohexanedimethanol, blended with from about 1 to about 30 weight % of certain bisphenols such as bisphenol-A, and naphthalene diols. Films or sheets of these compositions are characterized by having greatly reduced oxygen, carbon dioxide and water vapor permeabilities.
Inventors
- 👤 Robert W. Seymour
- 👤 Ronald R. Light
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:58
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/375; C08K5/04; C08K5/13; C08K5/41
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
120 words
A polyester composition having improved gas and water barrier properties, an I.V. of from about 0.4 to about 1.0, and being the reaction product of an acid component comprising terephthalic acid or mixtures of terephthalic acid with up to about 50 mole % of one or more of isophthalic acid, 2,6-naphthalenedicarboxylic acid, or 1,4-cyclohexanedicarboxylic acid, and a glycol component comprising ethylene glycol or 1,4-cyclohexanedimethanol or mixtures thereof in any proportion, and up to about 30 mole % of other glycol, said polyester having blended therewith in nonreacted form from about 1 to about 30% by weight of an additive component comprising one or more naphthalenediols and/or bisphenols of the formula ##STR5## wherein Y is ##STR6## --SO 2 --, or --S--.
Claim 2
Dependent Claim
120 words
A polyester composition having improved gas and water barrier properties, an I.V. of from about 0.4 to about 1.0, and being the reaction product of an acid component comprising terephthalic acid or mixtures of terephthalic acid with up to about 50 mole % of one or more of isophthalic acid, 2,6-naphthalenedicarboxylic acid, or 1,4-cyclohexanedicarboxylic acid, and a glycol component comprising ethylene glycol or 1,4-cyclohexanedimethanol or mixtures thereof in any proportion, and up to about 30 mole % of other glycol, said polyester having blended therewith in nonreacted form from about 1 to about 30% by weight of an additive component comprising one or more naphthalenediols and/or bisphenols of the formula ##STR5## wherein Y is ##STR6## --SO 2 --, or --S--.
Claim 3
Dependent Claim
30 words
A composition according to claim 1 wherein the glycol component is ethylene glycol or 1,4-cyclohexanedimethanol, or mixtures thereof in any proportion, and up to 5.0 mole % of diethylene glycol.
Claim 4
Dependent Claim
22 words
A composition according to claim 2 wherein said other glycol consists of one or more of 1,4-butanediol, neopentylglycol, 2,2,4-trimethyl-1,3-pentanediol, 1,6-hexanediol, and 1,3-propanediol.
Claim 5
Dependent Claim
11 words
A composition according to claim 3 wherein the acid is terephthalic.
Claim 6
Dependent Claim
38 words
A composition according to claim 1 wherein the acid is terephthalic and the glycol component is ethylene glycol, from about 10 to about 25 mole % 1,4-cyclohexanedimethanol, and from about 0.5 to about 5.0 mole % diethylene glycol.
Claim 7
Dependent Claim
19 words
A composition according to claim 1 containing from about 3 to about 20% by weight of said additive component.
Claim 8
Dependent Claim
15 words
A composition according to claims 2, 3, 4 or 5 wherein the additive is bisphenol-A.
Claim 9
Dependent Claim
15 words
A composition according to claims 2, 3, 4 or 5 wherein the additive is 4,4'-sulfonyl-diphenol.
Claim 10
Dependent Claim
15 words
A composition according to claims 2, 3, 4 or 5 wherein the additive is 2,7-naphthalenediol.
Claim 11
Dependent Claim
10 words
A sheet or film of the composition of claim 1.
Claim 12
Dependent Claim
15 words
A sheet or film of the composition of claims 1, 2, 3, 4 or 5.
References Cited (Backward Citations)
US3772405A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-02 | 1988-04-02 | 1988-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-02 | 1992-04-02 | 1992-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-02 | 1996-04-02 | 1996-10-02 | $7700.00 | Window Closed / Lapsed |