Modified vinyl alcohol polymer

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PROBLEM TO BE SOLVED : To provide a modified vinyl alcohol polymer which excels in the handling properties of an aqueous solution and gas barrier properties under high humidity and can increase the amount of modification and the degree of polymerization.SOLUTION : The modified vinyl alcohol polymer includes an alkyl group substituted with at least one hydroxyalkylene group and an N-alkyl (meth)acrylamide unit represented by formula (1) (wherein Ris hydrogen or a methyl group; Ris a 1-8C alkylene group; and Rand Rare the same or different and are hydrogen, a 1-8C alkyl group or a 1-8C hydroxyalkyl group).