Title:
METHOD FOR PRODUCING POLYIMIDE
Document Type and Number:
WIPO Patent Application WO/2023/249021
Kind Code:
A1
Abstract:
The present invention provides a method for producing a polyimide, the method comprising: a step 1 in which a diamine solution is obtained by dissolving a diamine in an organic solvent, and a tetracarboxylic acid dianhydride is added to and mixed with the diamine solution so as to obtain a homogeneous solution; and a step 2 in which the tetracarboxylic acid dianhydride and the diamine are polycondensed with each other. With respect to this method for producing a polyimide, in the step 1, it is regulated such that the diamine solution does not exceed 100°C from the time when the addition of the tetracarboxylic acid dianhydride is started to the time when the solution becomes homogeneous. Consequently, the present invention enables the achievement of: a varnish which has a viscosity sufficient for coating; and a polyimide which has excellent colorlessness.
Inventors:
MATSUMARU TERUHISA (JP)
SUENAGA SHUYA (JP)
SUGITO KEN (JP)
SUENAGA SHUYA (JP)
SUGITO KEN (JP)
Application Number:
PCT/JP2023/022817
Publication Date:
December 28, 2023
Filing Date:
June 20, 2023
Export Citation:
Assignee:
MITSUBISHI GAS CHEMICAL CO (JP)
International Classes:
C08G73/10
Domestic Patent References:
| WO2022107545A1 | 2022-05-27 | |||
| WO2010137548A1 | 2010-12-02 | |||
| WO2019116940A1 | 2019-06-20 |
Foreign References:
| JP2010518222A | 2010-05-27 | |||
| JPS59199720A | 1984-11-12 | |||
| JP2014524512A | 2014-09-22 | |||
| JPH04106127A | 1992-04-08 | |||
| JP2017513959A | 2017-06-01 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
Download PDF: