Title:
METHOD FOR PRODUCING HIGHLY POLYMERIZABLE N-VINYLCARBOXYLIC ACID AMIDE MONOMER
Document Type and Number:
WIPO Patent Application WO/2021/132366
Kind Code:
A1
Abstract:
Provided is a method by which an N-vinylcarboxylic acid amide can be efficiently purified to produce a highly polymerizable N-vinylcarboxylic acid amide monomer. This method for producing a highly polymerizable N-vinylcarboxylic acid amide monomer is characterized by comprising: (A) a step (step (A)) in which a crude N-vinylcarboxylic acid amide monomer containing 50-88 mass% of an N-vinylcarboxylic acid amide monomer is melted by raising the temperature, then cooling is performed to cause precipitation (cooling crystallization), and the precipitated N-vinylcarboxylic acid amide monomer crystals are subjected to solid-liquid separation; and (B) a step (step (B)) in which the N-vinylcarboxylic acid amide monomer crystals separated in step (A) are dissolved in a mixed solvent of 1,2-dimethoxyethane and C6-C7 aliphatic hydrocarbon, then crystallization (solvent crystallization) is performed, and solid-liquid separation is performed to collect a purified product of the N-vinylcarboxylic acid amide monomer, wherein the mass ratio of 1,2-dimethoxyethane/N-vinylcarboxylic acid amide monomer crystals in step (B) is 0.01-0.5, and the mass ratio of C6-C7 aliphatic hydrocarbon/N-vinylcarboxylic acid amide monomer crystals in step (B) is 0.5-3.0.
Inventors:
KOBAYASHI TAKAMITSU (JP)
TANAKA NAOYUKI (JP)
TANAKA NAOYUKI (JP)
Application Number:
PCT/JP2020/048226
Publication Date:
July 01, 2021
Filing Date:
December 23, 2020
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
C07C231/24; C07C233/05
Domestic Patent References:
| WO2017145569A1 | 2017-08-31 | |||
| WO2008026757A1 | 2008-03-06 | |||
| WO2017145569A1 | 2017-08-31 |
Foreign References:
| JP2007070356A | 2007-03-22 | |||
| JPH0881428A | 1996-03-26 | |||
| JPH0789916A | 1995-04-04 | |||
| JPH02188560A | 1990-07-24 | |||
| JP2619204B2 | 1997-06-11 | |||
| JPS5126764B1 | 1976-08-09 | |||
| JP4099831B2 | 2008-06-11 | |||
| JPS5076015A | 1975-06-21 | |||
| JPS61106546A | 1986-05-24 |
Other References:
See also references of EP 4083017A4
Attorney, Agent or Firm:
SSINPAT PATENT FIRM (JP)
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