Method for producing polyvinyl alcohol

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United States of America Patent

PATENT NO 11365268
APP PUB NO 20210189028A1
SERIAL NO

17057556

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Abstract

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Provided is a method for producing a polyvinyl alcohol having improved mechanical strength without significantly impairing productivity. A method for producing a polyvinyl alcohol having an average degree of polymerization of 5.0×103 or more and 1.5×104 or less, the method including steps of: subjecting a vinyl ester-based monomer to suspension polymerization at a polymerization temperature of 10° C. or more and 50° C. or less with a polymerization rate of 10% or more and 70% or less to obtain a vinyl ester-based polymer; dissolving the vinyl ester-based polymer in an alcohol-based solvent; and carrying out a saponification reaction by adding a saponification catalyst to an alcohol-based solution of the dissolved vinyl ester-based polymer.

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Patent Owner(s)

  • DENKA COMPANY LIMITED

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Yamashita, Akihiro Niigata, JP 70 695

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