METHOD FOR PRODUCING POLYVINYL ALCOHOL

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:

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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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