Title:
METHOD FOR PRODUCING POLYVINYL ALCOHOL
Document Type and Number:
WIPO Patent Application WO/2022/025004
Kind Code:
A1
Abstract:
An aspect of the present invention is a method for producing a polyvinyl alcohol, the method comprising: a step for obtaining a polyvinyl ester solution by adding water to a solution containing a polyvinyl ester and an alcohol; and a step for obtaining a polyvinyl alcohol solution containing a polyvinyl alcohol by adding an alkaline catalyst to the polyvinyl ester solution to saponify the polyvinyl ester, wherein the added amount of the water is at most 4.0 mass% with respect to the total mass of the polyvinyl ester solution.
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Inventors:
YAMASHITA AKIHIRO (JP)
Application Number:
PCT/JP2021/027577
Publication Date:
February 03, 2022
Filing Date:
July 26, 2021
Export Citation:
Assignee:
DENKA COMPANY LTD (JP)
International Classes:
C08F8/12; C08F16/06
Foreign References:
JP2016145263A | 2016-08-12 | |||
JP2013124317A | 2013-06-24 | |||
JP2005089606A | 2005-04-07 | |||
JP2002138109A | 2002-05-14 |
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (JP)
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