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Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display device

A technology of liquid crystal alignment agent and solvent, which is applied in the direction of instruments, optics, nonlinear optics, etc., can solve the problems of rising manufacturing costs, the need for additional structures, complicated plate replacement, etc., achieve low viscosity, and suppress uneven display bad effect

Active Publication Date: 2019-07-16
NISSAN CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, flexographic printing has the following problems: various resin plates are required depending on the type of liquid crystal panel; it is complicated to replace the plate in the manufacturing process; in order to stabilize the film forming process, it is necessary to form a film on a dummy substrate and make a plate become a cause of the increase in the manufacturing cost of liquid crystal display panels, etc.
However, these methods have the disadvantage of requiring additional structures

Method used

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  • Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display device
  • Liquid crystal alignment agent, liquid crystal alignment film, and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0335] In the 40ml sample tube that puts stirring bar, measure the polyamic acid solution (PAA-1) 4.00g that obtains in synthesis example 1, the polyamic acid solution (PAA-2) 4.80g that obtains in synthesis example 2, Weighed NMP 23.20g, PB 6.80g, and DIBK1.20g, stirred at room temperature for 3 hours, and obtained liquid crystal aligning agent A1.

[0336] Using this liquid crystal aligning agent A1, the viscosity in 25 degreeC was measured. Thereafter, the following applicability evaluations were performed.

[0337] [Evaluation of Inkjet Coatability]

[0338] Using an inkjet coating device (manufactured by Hitachi Plant Technologies, Ltd.), the liquid crystal aligning agent A1 adjusted above was coated on the glass substrate on which chrome was vapor-deposited on the surface. Coating conditions were carried out at a discharge pitch of 40 μm, a coating speed of 100 mm / sec, an injection voltage of 13.0 V, and a coating area of ​​36×80 mm. The thickness of the coating film ...

Embodiment 2～9 and comparative example 1～9

[0346] The polyamic acid solutions obtained in Synthesis Examples 1 to 3, 5, 7 to 9 and the polyimide solutions obtained in Synthesis Examples 4 and 6 were prepared at predetermined blending ratios and solid contents shown in Table 1 below. Concentration and solvent ratio are used to dilute with various solvents to obtain liquid crystal aligning agents A2-A6 and liquid crystal aligning agents B1-B5, C1, D1, E1, F1, G1, H1 and I1. The composition ratios of the polyamic acid solution, the polyimide solution, and the solvent are shown in Table 1 together with Example 1.

[0347] In Table 1, the solid component composition and weight ratio represent the mixing ratio (% by mass) of each polymer. The composition and weight ratio of the solution represent the ratio (% by mass) of each organic solvent to the entire polymer solution.

[0348] [Table 1]

[0349]

[0350] In Table 2, each evaluation result etc. in Examples 1-9 and Comparative Examples 1-9 are collectively shown.

...

Synthetic example 10

[0354] Make tetracarboxylic dianhydride DC-3 (12.51g, 50.0mmol), diamine DA-7 (13.66g, 40.0mmol), diamine DA-11 (6.61g, 20.0mmol), diamine DA-13 (17.39 g, 40.0mmol) were dissolved in NMP (179.3g), and after reacting at 60°C for 5 hours, tetracarboxylic dianhydride DC-2 (9.61g, 49.0mmol) and NMP (59.8g) were added, and reacted at 40°C for 10 Hour, obtain polyamic acid solution.

[0355] After adding NMP to this polyamic-acid solution (100g) and diluting to 6.5 mass %, acetic anhydride (17.0g) and pyridine (5.3g) were added as an imidation catalyst, and it was made to react at 70 degreeC for 3 hours. This reaction solution was poured into methanol (1700 ml), and the obtained precipitate was filtered off. This deposit was wash|cleaned with methanol, it dried under reduced pressure at 100 degreeC, and obtained the polyimide powder (J). The imidization rate of this polyimide was 76%, the number average molecular weight was 11000, and the weight average molecular weight was 38000....

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Abstract

The present invention provides: a liquid crystal alignment agent which is capable of suppressing coating defects that occur in an alignment film due to the effects of a wiring structure or C / H, and suppressing a defect in which the display of a liquid crystal display device becomes non-uniform, and which has a reduced viscosity and an increased proportion of resin components; and a liquid crystalalignment film using the liquid crystal alignment agent. The present invention pertains to a liquid crystal alignment agent characterized by containing: at least one polymer selected from the group consisting of a polyimide precursor and polyimide, which is an imidized product thereof, and containing a protecting group that is removed by heat; and a solvent component containing a solvent from Group A below, a solvent from Group B below, and isobutyl ketone. The solvent from Group A is at least one solvent selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, gamma-butyrolactone, and 1,3-dimethylimidazolidinone, and the solvent from Group B is at least one solvent selected from the group consisting of butyl cellosolve, 1-butoxy-2-propanol, 2-butoxy-1-propanol,and dipropylene glycol dimethyl ether.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent suitable for inkjet coating and increasing the ratio of resin components while maintaining a low viscosity; and a liquid crystal aligning film obtained from the liquid crystal aligning agent. Background technique [0002] As a liquid crystal aligning film, a liquid crystal aligning agent mainly composed of a polyimide precursor such as polyamic acid (also referred to as polyamic acid) and a solution of a soluble polyimide is applied and fired. As for the liquid crystal aligning film of a polyimide system, spin coating, dip coating, flexographic printing, etc. are generally known as a film-forming method of the said liquid crystal aligning film. In practice, flexographic printing is mostly used for coating. [0003] However, flexographic printing has the following problems: various resin plates are required depending on the type of liquid crystal panel; it is complicated to replace the pl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C08G73/10
CPCC08G73/10G02F1/1337Y02P20/55C08G73/1032C08G73/1075C08L79/08G02F1/133723C08G73/1042
Inventor 万代淳彦宫本泰宏石川和典李柱永
Owner NISSAN CHEM IND LTD
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