Copolyester/polyester blends having reduced carbon dioxide perme

Details Copolyester/polyester blends having reduced carbon dioxide perme Copolyester/polyester blends having reduced carbon dioxide perme

1984-10-19

1986-03-25

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

524539, C08L 6702

Patent

active

045784370

ABSTRACT:
Disclosed are polyester blends and articles produced therefrom, wherein the blends contain copolyester material comprising one or a mixture of copolyesters such as that prepared from ethylene glycol and 1,4-cyclohexanedimethanol in certain molar proportions with terephthalic acid, blended in certain proportions with poly(ethylene isophthalate). Formed amorphous articles such as bottles, films and sheets of these blends unexpectedly are clear and show marked reduction in carbon dioxide permeability, e.g., about 20-40% lower than predicted, and have good oxygen and water vapor barrier properties. The blends are especially useful in food packaging applications such as carbonated drink bottles, where good gas and water vapor barrier properties are highly desirable.

REFERENCES:
patent: 3651172 (1972-03-01), Barkey
patent: 4098769 (1978-07-01), Go
patent: 4145517 (1979-03-01), Go
patent: 4403090 (1983-08-01), Smith
patent: 4482586 (1984-11-01), Smith

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