Modified vinyl alcohol polymer, modified vinyl alcohol polymer production method, particles, aqueous solution, coating liquid, coated article, molded product, release paper, dispersant, vinyl polymer production method, and mixture

A modified vinyl alcohol polymer comprising a structural unit represented by the following formula (1), and having a water-insoluble content of 1,000 ppm or less,

• wherein, in the formula (1),
• X, Y, and Z each independently represent an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, a phenyl group, a benzyl group, a vinylphenyl group, a halogenated alkyl group having 1 to 20 carbon atoms, a halogenated phenyl group, an aminoalkyl group having 1 to 20 carbon atoms, a mercaptoalkyl group having 1 to 20 carbon atoms, an ureidoalkyl group having 2 to 20 carbon atoms, an isocyanate alkyl group having 2 to 8 carbon atoms, a group having 3 to 20 carbon atoms and comprising an epoxy group, a group having 3 to 20 carbon atoms and comprising an acrylamide group, a group having 4 to 20 carbon atoms and comprising a methacrylamide group, an acetoxy group, or a group represented by —(CH2)n—O—R1 (wherein R1 represents a hydrogen atom, an alkali metal atom, an alkaline earth metal atom, an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an acryloyl group, a methacryloyl group, or a glycidyl group;
• and n represents an integer of 0 to 6).