CPC C08F 16/06 (2013.01) [C08J 7/16 (2013.01); C08F 2810/00 (2013.01); C08J 2329/04 (2013.01)] | 20 Claims |
1. A method for producing modified vinyl alcohol-based polymer particles, the method comprising:
mixing vinyl alcohol-based polymer particles with a mixed medium comprising an unsaturated carboxylic acid, an acid catalyst, and water, wherein by mixing the vinyl alcohol-based polymer particles with the mixed medium, the vinyl alcohol-based polymer particles are reacted with the unsaturated carboxylic acid to obtain modified vinyl alcohol-based polymer particles comprising a vinyl ester unit, having a vinyl alcohol unit content based on a total constitutional units of 60 mol % or more and less than 95 mol %, and having an average particle diameter from 50 to 2000 μm,
wherein the unsaturated carboxylic acid is a compound of formula (1):
wherein X denotes a carbon-carbon bond or a divalent saturated hydrocarbon group having a carbon number from 1 to 10 optionally having a branched structure, Y denotes a hydrogen atom or a saturated hydrocarbon group having a carbon number from 1 to 6 optionally having a branched structure, and Z denotes a hydrogen atom or a methyl group, and
the vinyl ester unit is a unit of formula (2):
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