Oblon, McClelland, Maier & Neustadt, L.L.P.
Modified polyvinyl alcohol, resin composition, and film
A modified PVA that enables formation of a film superior in cold water solubility, mechanical strength, and chemical resistance is provided. The modified PVA comprises a monomer unit represented by formula (I), and a structural unit represented by formula (II): wherein: a content of the monomer unit (I) is from 0.05 mol % to 10 mol %, and a content of the structural unit (II) is from 0.001 mol % to 0.5 mol % with respect to the total monomer units in the modified PVA; a viscosity average degree of polymerization is from 300 to 3,000; and a degree of saponification is from 82 mol % to 99.5 mol %. In the formula (I): R1 represents a hydrogen atom, or a methyl group; and R2 represents —R3—SO3−X+, —R3—N+(R4)3Cl−, or a hydrogen atom, R3 representing an alkanediyl group, X+ representing a hydrogen atom, a metal atom, or an ammonium group, and R4 representing an alkyl group. 
KURARAY CO., LTD.
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Yoko Masaki Masahiro
Mori Kato Takafuji