Thermoplastic polyester compositions having improved barrier properties
AssigneeEastman Kodak Company
InventorsRobert W. Seymour, Ronald R. Light
Life of this patent
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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.
Claims11
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.sub.2 --, or --S--.
Dependencies are inferred from the claim text.