Polyamic acid composition, and liquid crystal aligning agent and aligning film prepared from the same

Abstract

The invention relates to polyamic acid compound, which is produced with diamine reactant and dianhydride reactant. Said diamine reactant comprises at least one fluorine containing diamine of trifluoromethyl substituent on main chain with molar content being 20- 70%, and non- fluorine containing diamine with molar content being 30- 80%. Said dianhydride reactant comprises aromatic tetracarboxylic acid dianhydride with molar content being 65- 100%, and aliphatic tetracarboxylic acid dianhydride with its molar content being 0- 35%. The invention also provides liquid crystal orientation agent and orientation memebrane produced with said polyamic acid compound.

Description

technical field [0001] The invention relates to a polyamic acid composition, in particular to a polyamic acid composition prepared by using a diamine reactant having a fluorine-containing diamine component, and a liquid crystal using the polyamic acid composition Alignment agent and alignment film. Background technique [0002] With the vigorous development of the personal information product market, coupled with the advantages of liquid crystal display devices such as thinness and low power consumption, most of the industry is currently developing various miniaturized portable information products with liquid crystal display devices. The liquid crystal layer in the liquid crystal display device uses an external electric field to change its alignment state, and changes the light passing through the liquid crystal layer. Various liquid crystal display devices can be manufactured by utilizing the difference in the alignment state of the liquid crystal layer. Currently commerc...

AI Technical Summary

Problems solved by technology

With the miniaturization of various products, the current consumption of the overall device must be reduced as much as possible. In addition, ordinary liquid crystal materials containing cyano groups may absorb moisture, resulting in an increase in current consumption and a decrease in the voltage retention ratio of the liquid crystal display device. As a result, the reliability of the properties of the overall device is reduced, so the current trend of liquid crystal materials is towards the use of liquid crystal materials containing more fluorine atom groups

When liquid crystal materials containing more fluorine atom groups are used, although the reliability of the properties of the overall device can be improved, it is found that more non-uniform regions may be produced (especially at the interface between the surrounding frame and the liquid crystal), And the alignment properties of the liquid crystal material are seriously affected

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