Oblon, McClelland, Maier & Neustadt, L.L.P.
Modified polyvinyl alcohol and water-soluble film
The present invention provides: a water-soluble film that is superior in cold water solubility and in practical properties such as strength and stiffness and that can resist deterioration in various properties such as chemical resistance over time; and a modified polyvinyl alcohol used for the water-soluble film. The present invention relates to a modified polyvinyl alcohol containing 0.05 to 10 mol % of a monomer unit having two carboxyl groups. In 1H-NMR spectroscopy of the modified polyvinyl alcohol, an integral (X) from 6.8 to 7.2 ppm and an integral (Y) from 5.3 to 5.5 ppm satisfy the following expression: 0.60≤X/(X+Y)<1.0.
KURARAY CO., LTD.
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Yoko Tatsuya Masaki
Mori Tanida Kato