Title:
ポリビニルアルコールの製造方法
Document Type and Number:
Japanese Patent JP7303808
Kind Code:
B2
Abstract:
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 x 103 or more and 1.5 x 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.
Inventors:
Akihiro Yamashita
Application Number:
JP2020532258A
Publication Date:
July 05, 2023
Filing Date:
July 03, 2019
Export Citation:
Assignee:
Denka Company Limited
International Classes:
C08F16/06; C08F8/12
Domestic Patent References:
| JP61148209A | ||||
| JP2013177646A | ||||
| JP60190223A | ||||
| JP2002513034A | ||||
| JP2010202840A |
Foreign References:
| EP0250607A1 |
Attorney, Agent or Firm:
Axis International Patent Attorney Corporation