Title:
METHOD FOR PRODUCING BLOCK COPOLYMER
Document Type and Number:
WIPO Patent Application WO/2022/097575
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a method by which a target block copolymer is able to be produced at a temperature of from -5°C to 35°C. A method for producing a block copolymer according to the present invention comprises: a step (A) wherein a vinyl aromatic monomer is polymerized at a temperature of from -5°C to 35°C with use of an anionic polymerization initiator in a mixed solvent that contains an aprotic polar solvent and at least one nonpolar solvent that is selected from among methyl cyclohexane and methyl cyclopentane; a step (B) wherein a conjugated diene monomer is added and polymerized at a temperature of from -5°C to 35°C after the step (A); and if necessary, a step (C) wherein a vinyl aromatic monomer is added and polymerized at a temperature of from -5°C to 35°C after the step (B).
Inventors:
OSUMI SHOTA (JP)
NOSAKI TOSHIFUMI (JP)
UMEZAWA MASAHIRO (JP)
NOSAKI TOSHIFUMI (JP)
UMEZAWA MASAHIRO (JP)
Application Number:
PCT/JP2021/039983
Publication Date:
May 12, 2022
Filing Date:
October 29, 2021
Export Citation:
Assignee:
NIPPON SODA CO (JP)
International Classes:
C08F297/04
Domestic Patent References:
| WO2021153455A1 | 2021-08-05 |
Foreign References:
| JP2010280853A | 2010-12-16 | |||
| JP2009516019A | 2009-04-16 | |||
| JP2001172324A | 2001-06-26 | |||
| JP2020186761A | 2020-11-19 | |||
| JPH06192502A | 1994-07-12 |
Attorney, Agent or Firm:
HIROTA, Masanori (JP)
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