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Title:
METHOD FOR PRODUCING HIGHLY POLYMERIZABLE N-VINYLCARBOXAMIDE MONOMER
Document Type and Number:
WIPO Patent Application WO/2021/132364
Kind Code:
A1
Abstract:
Provided is a method with which it is possible to purify N-vinylcarboxamide efficiently and produce a highly polymerizable N-vinylcarboxamide monomer.　This method for producing a highly polymerizable N-vinylcarboxamide monomer is characterized in that: the method includes (A) a step for melting by heating a crude N-vinylcarboxamide monomer containing 50-88 mass% of N-vinylcarboxamide monomer, subsequently precipitating N-vinylcarboxamide monomer crystals through cooling (cooling precipitation), and subjecting the precipitated N-vinylcarboxamide monomer crystals to solid-liquid separation (step (A)), and (B) a step for furthermore dissolving the N-vinylcarboxamide monomer crystals separated in step (A) in a mixed solvent of acetonitrile and a C6-7 aliphatic hydrocarbon, conducting crystallization (solvent crystallization), and performing solid-liquid separation to recover an N-vinylcarboxamide monomer purified product (step (B)); the mass ratio of acetonitrile/N-vinylcarboxamide monomer crystals in step (B) is 0.01-0.5 (inclusive); and the mass ratio of C6-7 aliphatic hydrocarbon/N-vinylcarboxamide monomer crystals in step (B) is 0.5-3.0 (inclusive).

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Inventors:
KOBAYASHI TAKAMITSU (JP)
TANAKA NAOYUKI (JP)
Application Number:
PCT/JP2020/048224
Publication Date:
July 01, 2021
Filing Date:
December 23, 2020
Export Citation:
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Assignee:
SHOWA DENKO KK (JP)
International Classes:
C07C231/24; C07C233/05
Domestic Patent References:
WO2017145569A12017-08-31
WO2008026757A12008-03-06
WO2017145569A12017-08-31
Foreign References:
JP2007070356A2007-03-22
JPH0881428A1996-03-26
JPH0789916A1995-04-04
JPH02188560A1990-07-24
JP2619204B21997-06-11
JPS5126764B11976-08-09
JP4099831B22008-06-11
JPS5076015A1975-06-21
JPS61106546A1986-05-24
Other References:
See also references of EP 4083015A4
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
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