POLYESTER COMPOSITION HAVING IMPROVED GAS BARRIER PROPERTIES

摘要

Polyester compositions are disclosed for use in the form of a film or container having improved gas barrier properties comprising homo- or copolyesters derived from terephthalic acid or mixtures of terephthalic acid with 2,6-naphthalene dicarboxylic acid or isophthalic acid and a glycol component, such as ethylene glycol, and containing from 5 to 17 mole % of a biphenol aromatic hydroxy compound. Films of these compositions are characterized by having greatly reduced oxygen permeabilities and can be used for packaging materials, particularly, for packaging food or drink.