Title:
METHOD FOR PRODUCING POLYIMIDE RESIN
Document Type and Number:
WIPO Patent Application WO/2020/137872
Kind Code:
A1
Abstract:
The present invention provides a method for producing a polyimide resin, which is capable of controlling the molecular weight. This method for producing a polyimide resin comprises: a step (I) for obtaining an intermediate (K), said step (I) comprising a step (A) wherein a diamine compound and a carboxylic acid compound having three or more carbonyl groups are reacted with each other; a step (II) wherein the viscosity A of the reaction system is measured after the step (I); and a step (III) wherein the viscosity A is compared with a target viscosity range of the reaction system so as to check whether the viscosity A is within the target viscosity range or not.
Inventors:
OKUBO EMI (JP)
NISHIYAMA NATSUMI (JP)
MIYAMOTO KOJI (JP)
NISHIYAMA NATSUMI (JP)
MIYAMOTO KOJI (JP)
Application Number:
PCT/JP2019/050061
Publication Date:
July 02, 2020
Filing Date:
December 20, 2019
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
International Classes:
C08G73/10
Foreign References:
| JP2007231224A | 2007-09-13 | |||
| JP2017186285A | 2017-10-12 | |||
| JP2017008276A | 2017-01-12 | |||
| JP2006182854A | 2006-07-13 | |||
| JPS57212230A | 1982-12-27 | |||
| JPH0859832A | 1996-03-05 | |||
| JP2019151818A | 2019-09-12 | |||
| JP2019143124A | 2019-08-29 |
Attorney, Agent or Firm:
NAKAYAMA, Tohru et al. (JP)
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