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Title:
RESIN PURIFICATION METHOD
Document Type and Number:
WIPO Patent Application WO/2022/138409
Kind Code:
A1
Abstract:
Provided is a method for efficiently removing impurities from an aliphatic polycarbonate resin while suppressing a decrease in the mass average molecular weight of the aliphatic polycarbonate resin.　More specifically, provided is a method for purifying an aliphatic polycarbonate resin, wherein the method includes (A) mixing a resin solution obtained by dissolving an aliphatic polycarbonate resin in a good solvent with a poor solvent or a nonsolvent of the aliphatic polycarbonate resin and precipitating the aliphatic polycarbonate resin and (B) applying a wash solution obtained by mixing a good solvent with a poor solvent or a nonsolvent in a mass ratio of 7:3-3:7 to the precipitated aliphatic polycarbonate resin obtained in (A).

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Inventors:
FUNADA ATSUSHI (JP)
HACHIKEN SHIZUKA (JP)
KODA TOKUSHI (JP)
Application Number:
PCT/JP2021/046403
Publication Date:
June 30, 2022
Filing Date:
December 16, 2021
Export Citation:
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Assignee:
SUMITOMO SEIKA CHEMICALS (JP)
International Classes:
C08G64/02; C08G64/40
Foreign References:
JP2018131552A2018-08-23
JP2009041011A2009-02-26
JP2018197282A2018-12-13
JP2014125495A2014-07-07
JPS3816347B11963-08-29
CN101928387A2010-12-29
Attorney, Agent or Firm:
SAEGUSA & PARTNERS (JP)
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