| 摘要 |
Disclosed are thermoplastic copolyesters having improved gas barrier properties and which can be produced having little or no acetaldehyde. These copolyesters are especially useful in the manufacture of foo d packaging products, foodtrays, film and beverage bottles which require good oxygen and carbon dioxide barrier properties. The copolyester s comprise repeat units from 10 to 100 mole percent repeat units from naphtalene dicarboxylic acid, 90 to 0 mole percent repeat unit s from terephthalic acid and repeat units from essentially 100 mole percent 1,4-cyclohexane-dimethanol, wherein said 1,4-cyclohexanedimetha nol has a cis isomer content of at least 50 % said copolyester having an I.V. of 0.4-1.2.
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