Title:
BLOCK COPOLYMER, METHOD FOR PRODUCING SAME, AND ABSORBER AND ABSORBENT ARTICLE USING SAME
Document Type and Number:
WIPO Patent Application WO/2021/251324
Kind Code:
A1
Abstract:
This block copolymer (A) contains a vinyl alcohol-based polymer block (b), and an ionic polymer block (c) including a vinyl alcohol-based monomer and a monomer unit having an ionic group forming a salt. The ionic group is a carboxylate group, a sulfonate group, or an ammonium group. The number average molecular weight (Mnb) of the polymer block (b) is 15,000-220,000. The contained amount of the vinyl alcohol-based monomer unit with respect to all monomer units in the ionic polymer block (c) is 5-95 mol%. The number average molecular weight (MnA) of the block copolymer (A) is 20,000-440,000. A ratio (Mnb/MnA) of the number average molecular weight (Mnb) with respect to the number average molecular weight (MnA) is 0.1-0.9. Such block copolymer has high absorbability with respect to water, salt water, and the like, and has both gel shape retaining ability and water solubility.
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Inventors:
TAKAYAMA TAKUMI (JP)
MAEKAWA KAZUHIKO (JP)
MISHIMA KAZUTOSHI (JP)
MAEKAWA KAZUHIKO (JP)
MISHIMA KAZUTOSHI (JP)
Application Number:
PCT/JP2021/021513
Publication Date:
December 16, 2021
Filing Date:
June 07, 2021
Export Citation:
Assignee:
KURARAY CO (JP)
International Classes:
A23L3/00; A01G24/35; A01K23/00; A61F13/53; A61L15/24; A61L15/64; B01J20/26; B01J20/30; C08F8/12; C08F293/00; C08L101/16
Domestic Patent References:
| WO2020262517A1 | 2020-12-30 |
Foreign References:
| JPH05140239A | 1993-06-08 | |||
| JPH0586146A | 1993-04-06 | |||
| JP2004001461A | 2004-01-08 | |||
| JPH10287714A | 1998-10-27 | |||
| JPS6390524A | 1988-04-21 | |||
| JP2016155106A | 2016-09-01 | |||
| JPH0733818A | 1995-02-03 | |||
| JPH08196901A | 1996-08-06 |
Other References:
"Highly Stretchable Free-Standing Poly(acrylic acid)-block-poly(vinyl alcohol) Films Obtained from Cobalt-Mediated Radical Polymerization", MACROMOLECULES, vol. 50, 2017, pages 6054 - 6063
"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, 2008, pages 2353 - 2360
"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, 2008, pages 2353 - 2360
Attorney, Agent or Firm:
SETOUCHI INTERNATIONAL PATENT FIRM (JP)
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