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Method for Producing Ethylene-Vinyl Alcohol Copolymer, Ethylene-Vinyl Alcohol Copolymer, Resin Composition and Multilayer Structure
Method for Producing Ethylene-Vinyl Alcohol Copolymer, Ethylene-Vinyl Alcohol Copolymer, Resin Composition and Multilayer Structure
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机译:制备乙烯 - 乙烯醇共聚物,乙烯 - 乙烯醇共聚物,树脂组合物和多层结构的方法
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摘要
An ethylene-vinyl alcohol copolymer has an ethylene content of 20 to 60 mol % and includes a carboxylic acid group and a lactone ring group present at terminals thereof, wherein the molar concentration (Y/Z) of a lactone ring molar content (Y) to a sum (Z) of a carboxylic acid molar content (X) and the lactone ring molar content (Y) is not less than 58 mol %. The ethylene-vinyl alcohol copolymer is excellent in high-temperature thermal stability substantially without thermal decomposition, and is free from odor emanation and coloration even if being processed at a higher temperature.
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