| http://www.w3.org/ns/prov#value | - In summary of the present invention, the present invention is a method for producing a solution containing at least an unsaturated carboxylic acid-modified vinyl alcohol polymer characterized by reacting a vinyl alcohol polymer and an unsaturated carboxylic acid compound in the presence of an acid catalyst soluble in the reaction system or a solid acid catalyst, and a gas barrier film obtained by
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