Liquid crystal alignment agent and liquid crystal display unit for ink-jet coating

A liquid crystal alignment agent, inkjet technology, applied in liquid crystal materials, chemical instruments and methods, instruments, etc., can solve the problems of poor coating, clogging of inkjet nozzles, uneven coating, etc., and achieve excellent uniformity of film thickness Effect

Inactive Publication Date: 2007-12-19
JSR CORPORATIOON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in actual production, when inkjet coating is carried out continuously, there are problems that cannot be solved only by optimizing the above-mentioned parameters of the liquid crystal aligning agent such as the used solvent, surface tension, solid content concentration, viscosity, etc.
For example, liquid crystal aligning agents are generally stored frozen at a low temperature below 0°C in consideration of storage stability, and then thawed at room temperature for use. The aggregate cannot be completely eliminated after thawing, and it will become the cause of clogging of the inkjet nozzle when the inkjet device is continuously operated, resulting in poor coating and uneven coating

Method used

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  • Liquid crystal alignment agent and liquid crystal display unit for ink-jet coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0093] Hereinafter, although an Example demonstrates this invention more concretely, this invention is not limited to these Examples. In Examples and Comparative Examples, polymer molecular weight measurement, imidization rate measurement, liquid crystal aligning agent inkjet coating property, viscosity, particle number measurement, and measurement of voltage holding rate of manufactured cell were evaluated by the following methods .

[0094] [Weight average molecular weight and molecular weight distribution]

[0095] Gel permeation chromatography (GPC, manufactured by Tosoh Corporation, trade name: HLC-8020 / 3 columns: manufactured by Tosoh Corporation, trade names: TSK guardcolum α, TSK gel α-M, TSK gel α -2500), using dimethylformamide (DMF; 9.4 g of lithium bromide monohydrate and 1.7 g of phosphoric acid were added to 3 L of DMF) as a solvent, and the polystyrene-equivalent weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn). Wherein, the abo...

Synthetic example 1

[0106] Synthesis example 1 (synthesis of polyamic acid P-1)

[0107] 38 g (0.17 mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride, 12 g (0.057 mol) of pyromellitic dianhydride, p-phenylenediamine as diamine compound 19 g (0.17 mol) and 30 g (0.058 mol) of diamine represented by the above formula (14) were dissolved in 400 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 4 hours. In preparation of a liquid crystal aligning agent, this polymerization solution was used as it is. Moreover, the molecular weight of the polyamic acid in this polymerization liquid (this is referred to as "polymer P-1") measured by gel permeation chromatography was Mw=153,000, Mw / Mn=6.36.

Synthetic example 2

[0108] Synthesis example 2 (synthesis of imidized polymer P-2)

[0109] With 2,3,5-tricarboxycyclopentyl acetic acid dianhydride 21g (0.093 mole) as tetracarboxylic acid dianhydride, p-phenylenediamine 9.2g (0.085 mole) as diamine compound, above-mentioned formula (14) 4.9 g (0.0095 mol) of the indicated diamine was dissolved in 140 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 5 hours. 360 g of N-methyl-2-pyrrolidone was added to the obtained polymerization liquid, and after stirring well, 7.4 g of pyridine and 9.5 g of acetic anhydride were added, and dehydration and ring closure were performed at 110° C. for 4 hours. After the imidization reaction, the solvent in the system is replaced with a new N-methyl-2-pyrrolidone (in this operation, the pyridine and acetic anhydride used in the imidization reaction are removed outside the system), An imidized polymer solution having a solid content concentration of 17% by weight was obtained. In addition, the molecular weig...

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Abstract

The invention relates to a liquid crystal orienting agent for ink and liquid crystal display element. The liquid crystal orienting agent can form liquid crystal orienting film with good homogeneity of film thickness without bad and uneven coating reduced from nozzle fouling, when forming liquid crystal orienting film on baseplate using inking coating method. The said liquid crystal orienting agent for ink contains polyamic acid formed by polyaddition reaction of tetracarboxylic dianhydride and the diamine compound and /or imidized polymer obtained by imide-izing polyamic acid. The liquid crystal orienting agent for ink jets in a range whose rate of the formation of average imide showing a rate of an imide bonding unit in the above-mentioned polymer total amount is 0-55-mol %.

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent for inkjet coating and a liquid crystal display element having a liquid crystal aligning film formed from the aligning agent. More specifically, it relates to a liquid crystal alignment film capable of forming a liquid crystal alignment film excellent in film thickness uniformity without causing poor coating or uneven coating due to nozzle clogging when forming a liquid crystal alignment film on a substrate by an inkjet coating method. Liquid crystal aligning agent for film and liquid crystal display element with beautiful image. Background technique [0002] From the perspective of saving space and reducing power consumption, since the mass production of liquid crystal electronic calculators, liquid crystal display components represented by liquid crystal displays have been applied to watches, portable game machines, word processors, notebook personal computers, Active development conti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/1337C09K19/38
CPCC08G73/10C09K19/56G02F1/133723
Inventor 宫本佳和松本贵博林英治西川通则
Owner JSR CORPORATIOON
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