Title:
高純度の１，３−ジアルキルシクロブタン−１，２，３，４−テトラカルボン酸−１，２：３，４−二無水物の製造方法
Document Type and Number:
Japanese Patent JP6919745
Kind Code:
B2
Abstract:
Provided is an efficient method for producing a high purity 1,3-dialkyl -1,2,3,4- cyclobutane tetracarboxylic acid-1,2:3,4-di-anhydride which is a raw material of a polyimide or the like. The present invention is a method for producing a 1,3-dialkyl cyclobutane-1,2,3,4-tetracarboxylic acid-1,2:3,4-di-anhydride by heating and cooling a mixture of a 1,3-dialkyl cyclobutane-1,2,3,4-tetracarboxylic acid-1,2:3,4-di-anhydride and a 1,2-dialkyl cyclobutane-1,2,3,4-tetracarboxylic acid-1,2:3,4-di-anhydride in an organic solvent and filtering the same whereby a high purity 1,3-dialkyl -1,2,3,4- cyclobutane tetracarboxylic acid-1,2:3,4-di-anhydride is filtered off as a solid.
Inventors:
Mitsumasa Kondo
Application Number:
JP2020079393A
Publication Date:
August 18, 2021
Filing Date:
April 28, 2020
Export Citation:
Assignee:
Nissan Chemical Co., Ltd.
International Classes:
C07D493/04
Domestic Patent References:
| JP2006347931A | ||||
| JP2008050567A |
Foreign References:
| WO2008153287A1 | ||||
| WO2012176822A1 |
Attorney, Agent or Firm:
Toshiharu Ogawa
Kenji Izumina
Kenji Izumina