Title:
METHOD FOR PRODUCING POLYIMIDE VARNISH
Document Type and Number:
WIPO Patent Application WO/2023/249022
Kind Code:
A1
Abstract:
The present invention provides a method for producing a polyimide varnish, the method comprising: a polycondensation step in which one or more tetracarboxylic acid dianhydrides and one or more diamine compounds are subjected to a polycondensation reaction, thereby obtaining a reaction product (x); a step in which an organic solvent is subjected to inert gas bubbling, thereby obtaining a solvent (y) for dilution; and a dilution step in which the reaction product (x) and the solvent (y) for dilution are mixed with each other, thereby obtaining a polyimide solution that has a dissolved oxygen concentration of 0.23 mg/L or less. Consequently, the present invention enables the achievement of a varnish which contains a solvent-soluble polyimide, while being free from coloring and exhibiting excellent colorlessness.
Inventors:
SUENAGA SHUYA (JP)
MATSUMARU TERUHISA (JP)
SUGITO KEN (JP)
MATSUMARU TERUHISA (JP)
SUGITO KEN (JP)
Application Number:
PCT/JP2023/022818
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:
| WO2019189483A1 | 2019-10-03 | |||
| WO2022045356A1 | 2022-03-03 |
Foreign References:
| JP2019174801A | 2019-10-10 | |||
| JP2019001989A | 2019-01-10 | |||
| JP2015042718A | 2015-03-05 | |||
| JP2022087023A | 2022-06-09 | |||
| JP2023082676A | 2023-06-14 |
Attorney, Agent or Firm:
OHTANI PATENT OFFICE (JP)
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