Title:
POLYVINYL ALCOHOL AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/170974
Kind Code:
A1
Abstract:
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.
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Inventors:
TAKAYAMA TAKUMI (JP)
AMANO YUSUKE (JP)
MAEKAWA KAZUHIKO (JP)
DETREMBLEUR CHRISTOPHE (BE)
DEBUIGNE ANTOINE (BE)
JEROME CHRISTINE (BE)
AMANO YUSUKE (JP)
MAEKAWA KAZUHIKO (JP)
DETREMBLEUR CHRISTOPHE (BE)
DEBUIGNE ANTOINE (BE)
JEROME CHRISTINE (BE)
Application Number:
PCT/JP2017/013493
Publication Date:
October 05, 2017
Filing Date:
March 30, 2017
Export Citation:
Assignee:
KURARAY CO (JP)
UNIV LIEGE (BE)
UNIV LIEGE (BE)
International Classes:
C08F16/06; C08F6/08; C08F18/08
Domestic Patent References:
| WO2011118598A1 | 2011-09-29 |
Foreign References:
| JPH11147914A | 1999-06-02 |
Other References:
DEBUIGNE ANTOINE ET AL.: "Amphiphilic Poly(vinyl acetate)-b-poly(N-vinyl pyrrolidone) and Novel Double Hydrophilic Poly(vinyl alcohol)-b-poly (N-vinylpyrrolidone) Block Copolymers Prepared by Cobalt-Mediated Radical Polymerization", MACROMOLECULES, vol. 40, no. 20, October 2007 (2007-10-01), pages 7111 - 7118, XP055553054
DETREMBLEUR CHRISTOPHE: "Preparation of Well- Defined PVOH/C60 Nanohybrids by Cobalt-Mediated Polymerization of Vinyl Acetate", MACROMOLECULAR RAPID COMMUNICATIONS, vol. 27, no. 7, April 2006 (2006-04-01), pages 498 - 504, XP055553063
DEBUIGNE ANTOINE ET AL.: "Synthesis of Novel Well-Defined Poly(vinyl acetate)-b-poly (acrylonitrile) and Derivatized Water-Soluble Poly(vinyl alcohol)-b-poly(acrylic acid) Block Copolymers by Cobalt-Mediated Radical Polymerization", MACROMOLECULES, vol. 41, no. 7, April 2008 (2008-04-01), pages 2353 - 2360, XP055553069
BRYASKOVA RAYNA ET AL.: "Copolymerization of Vinyl Acetate with 1-Octene and Ethylene by Cobalt-Mediated Radical Polymerization", J POLYM SCI, vol. 45, no. 12, June 2007 (2007-06-01), pages 2532 - 2542, XP055480203
See also references of EP 3438139A4
DETREMBLEUR CHRISTOPHE: "Preparation of Well- Defined PVOH/C60 Nanohybrids by Cobalt-Mediated Polymerization of Vinyl Acetate", MACROMOLECULAR RAPID COMMUNICATIONS, vol. 27, no. 7, April 2006 (2006-04-01), pages 498 - 504, XP055553063
DEBUIGNE ANTOINE ET AL.: "Synthesis of Novel Well-Defined Poly(vinyl acetate)-b-poly (acrylonitrile) and Derivatized Water-Soluble Poly(vinyl alcohol)-b-poly(acrylic acid) Block Copolymers by Cobalt-Mediated Radical Polymerization", MACROMOLECULES, vol. 41, no. 7, April 2008 (2008-04-01), pages 2353 - 2360, XP055553069
BRYASKOVA RAYNA ET AL.: "Copolymerization of Vinyl Acetate with 1-Octene and Ethylene by Cobalt-Mediated Radical Polymerization", J POLYM SCI, vol. 45, no. 12, June 2007 (2007-06-01), pages 2532 - 2542, XP055480203
See also references of EP 3438139A4
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
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