Title:
METHOD FOR PRODUCING POLYIMIDE VARNISH
Document Type and Number:
WIPO Patent Application WO/2023/249023
Kind Code:
A1
Abstract:
The method for producing a polyimide varnish polycondenses one or more tetracarboxylic dianhydrides and one or more diamines in an organic solvent at a reaction temperature of 160-220°C to obtain a reaction solution and lowers the temperature of the reaction solution from the reaction temperature to 120°C at a rate of 4°C/min or more by introducing a diluting solvent to stop the reaction. A method for producing a polyimide varnish that contains a solvent-soluble polyimide, has no coloration, and can obtain a varnish having excellent colorlessness can be provided according to the present invention.
Inventors:
SUENAGA SHUYA (JP)
MATSUMARU TERUHISA (JP)
SUGITO KEN (JP)
MATSUMARU TERUHISA (JP)
SUGITO KEN (JP)
Application Number:
PCT/JP2023/022819
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:
| WO2019116940A1 | 2019-06-20 | |||
| WO2020196103A1 | 2020-10-01 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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