[en] According to the present invention a polyvinyl alcohol is produced by performing: a polymerization step wherein a polymer solution containing a polyvinyl ester is obtained by polymerizing a vinyl ester monomer by means of controlled radical polymerization in the presence of a radical initiator and an organic cobalt complex; an extraction step wherein a cobalt complex is extracted from the polymer solution by bringing the polymer solution into contact with an aqueous solution containing a water-soluble ligand; and a saponification step wherein a polyvinyl alcohol is obtained by saponifying the polyvinyl ester after the extraction step. Consequently, the present invention provides a method for producing a polyvinyl alcohol which has narrow molecular weight distribution, high number average molecular weight and good hue, while exhibiting good solubility in water.
Research Center/Unit :
CESAM Complex and Entangled Systems from Atoms to Materials (CESAM) Center for Education and Research on Macromolecules (CERM)
Disciplines :
Materials science & engineering Chemistry
Inventor :
Takayama, Takumi
Amano, Yusuke
Maekawa, Kazuko
Detrembleur, Christophe ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Debuigne, Antoine ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Jérôme, Christine ; University of Liège (ULiège), Complex and Entangled Systems from Atoms to Materials (CESAM), Center for Education and Research on Macromolecules (CERM)
Title (54) :
Polyvinyl alcohol and method for producing same
Publication date (43-45) :
05 October 2017
Filing date (22) :
30 March 2017
Patent/publication number (10-11) :
WO 2017170974
Patent status (13) :
A
Priority number (30) :
JP20160072465 20160331
International classification (IPC) (51) :
C08F16/06; C08F18/08; C08F6/08
European classification (ECLA) (52) :
-
Applicant (71) :
University of Liège (ULiège), Kuraray Co (Japan)
Publication organism (19) :
International Application Published under the Patent Cooperation Treaty (PCT)
