Polyester packaging material
AssigneeTeijin Limited
InventorsMasahiko Hirose, Takatoshi Kuratsuji, Toshihiro Santa
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Abstract
A packaging polyester material comprising a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole % of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms. This packaging material is excellent in the resistance to the permeation of gases.
Claims9
A polyester packaging material having excellent resistance to the permeation of gases, said material comprised of a polyethylene terephthalate component and a component of polyethylene isophthalate copolymerized with 5 to 60 mole% of an aliphatic hydroxycarboxylic acid having up to 8 carbon atoms and wherein the copolymerized polyethylene isophthalate component is present in such an amount that the content of the units of the aliphatic hydroxycarboxylic acid is 3 to 25 mole% based on the total polyester.
Dependencies are inferred from the claim text.