Polyimide resin and production method therefor, polyimide solution, and polyimide film and production method therefor

Abstract

This polyimide is provided with an acid dianhydride-derived structure and a diamine-derived structure. The polyimide includes, in a ratio in a prescribed range, an alicyclic acid dianhydride and a fluorine-containing aromatic acid dianhydride, as acid dianhydrides, and includes, in a ratio in a prescribed range, a 3,3'-diaminodiphenyl sulfone and a fluoroalkyl-substituted benzidine, as diamines. The polyimide exhibits excellent solubility in solvents. Furthermore, the polyimide exhibits little discolouration, excellent transparency, and excellent mechanical strength.

Description

technical field [0001] The present invention relates to polyimide resin and its manufacturing method, polyimide solution, polyimide film and its manufacturing method. Background technique [0002] With the rapid progress of electronic devices such as displays, touch panels, and solar cells, thinning, lightening, and further flexibility of the devices are required. In response to these requirements, research is underway to replace glass materials used for substrates, cover windows, and the like with plastic film materials. Especially in applications that require high heat resistance, dimensional stability at high temperatures, and high mechanical strength, polyimide films are being studied as glass substitute materials. [0003] Normal wholly aromatic polyimides are colored yellow or brown and do not show solubility in organic solvents. Introduction of an alicyclic structure, introduction of a curved structure, introduction of a fluorine substituent, etc. are known as a met...

AI Technical Summary

Problems solved by technology

In thermal imidization without using an imidization catalyst or a dehydrating agent, heat treatment at a high temperature is required for imidation, so the film tends to be colored yellow and the transparency tends to decrease

In addition, in thermal imidization, it is not easy to completely remove the water generated by the dehydration of polyamic acid

The imidization catalyst, dehydrating agent, water, etc. remaining in the film may cause defects such as voids, resulting in a decrease in the mechanical strength and toughness of the film

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