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Oxygen gas high barrier transparent laminated polyester film, method for producing the same, and packaging material
Oxygen gas high barrier transparent laminated polyester film, method for producing the same, and packaging material
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机译:氧气高阻隔性透明层压聚酯薄膜,其制造方法以及包装材料
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摘要
A transparent, biaxially oriented polyester film (I) has a base layer consisting of at least 80 wt.% of a thermoplastic polyester and a covering layer. The covering layer consists of a polymer or mixture of polymers comprising at least 40 wt.% ethylene-2,6-naphthalate units and upto 60 wt.% ethylene terephthalate units and optionally up to 60 wt.% of other cycloaliphatic or aromatic diols and/or dicarboxylic acids. The Tg 2 value of the polyester film is greater than that of the base layer but less than that of the covering layer. Also claimed is a process for the production of (I) by co-extruding the base and covering layer(s) to form a film, biaxially stretching the film followed by thermal fixing.
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