Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Liquid crystal alignment agents for forming horizontal alignment film and liquid crystal display element

A liquid crystal aligning agent, a technology of horizontal alignment, applied in the directions of liquid crystal materials, chemical instruments and methods, optics, etc., can solve the problems of poor solubility, poor liquid crystal alignment, uneven film thickness, etc.

Active Publication Date: 2008-08-27
JSR CORPORATIOON
View PDF5 Cites 18 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using a liquid crystal aligning film obtained by coating a known liquid crystal aligning agent containing polyamic acid or an imidized polymer formed by dehydration and ring closure in the past to prepare a liquid crystal display element, there are problems due to environmental temperature during printing, etc. The problem of uneven film thickness caused by the change, which has a bad influence on the display characteristics of the liquid crystal display element
In addition, when the solubility of the solvent to polyimide is poor, there will be problems that the coating film will collapse during printing and some liquid crystals will have poor alignment.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Liquid crystal alignment agents for forming horizontal alignment film and liquid crystal display element
  • Liquid crystal alignment agents for forming horizontal alignment film and liquid crystal display element
  • Liquid crystal alignment agents for forming horizontal alignment film and liquid crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0111] [printability]

[0112]

[0113] The polymer was dissolved in a mixed solvent of γ-butyrolactone / N-methylpyrrolidone / butyl cellosolve / the third solvent to prepare a solution with a solid content concentration of 4% by weight, and the solution was passed through a filter with a pore size of 0.2 μm Filtrate to prepare the liquid crystal aligning agent of the present invention. The above-mentioned liquid crystal alignment agent was coated on the transparent electrode surface of a glass substrate with a transparent electrode formed of an ITO film using a JET-CM continuous inkjet printer (Kishu Giken Industry Co., Ltd.), and the coated substrate was left to stand. 1 minute. It was dried on a hot plate at 80° C. for 1 minute, and then dried on a hot plate at 180° C. for 20 minutes to form a film with an average film thickness of 600 Ȧ. This substrate was observed with a microscope at a magnification of 20 times, and it was judged as "good" when there was no coating uneven...

Synthetic example 1

[0122] 112g (0.5mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 157g (0.5mol) of 1,3,3a,4,5,9b-hexahydro-8- Methyl-5-(tetrahydro-2,5-dioxo-3-furyl)-naphtho[1,2-c]-furan-1,3-dione, 95 g (0.875 mol) as diamine Compound p-phenylenediamine, 25g (0.1mol) bisaminopropyl tetramethyldisiloxane, 13g (0.01mol) 3,6-bis(4-aminobenzoyloxy)cholestane, 8.1g (0.03 mol) of n-octadecylamine as a monoamine was dissolved in 960 g of N-methyl-2-pyrrolidone, and reacted at 60° C. for 6 hours. A small amount of the obtained polyamic acid solution was fractionated, NMP was added, and the viscosity was measured with a solution having a solid content concentration of 10% by weight, and it was 60 mPa·s. Next, 2,700 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, 396 g of pyridine and 409 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, replace the s...

Synthetic example 2

[0124]112g (0.5mol) of 2,3,5-tricarboxycyclopentylacetic dianhydride as tetracarboxylic dianhydride and 157g (0.5mol) of 1,3,3a,4,5,9b-hexahydro-8- Methyl-5-(tetrahydro-2,5-dioxo-3-furyl)-naphtho[1,2-c]-furan-1,3-dione, 96 g (0.885 mol) as diamine Compound p-phenylenediamine, 25g (0.1mol) of bisaminopropyl tetramethyldisiloxane, 8.1g (0.03mol) of n-octadecylamine as a monoamine were dissolved in 1,190g of N-methyl-2 - pyrrolidone, reacted at 60°C for 6 hours. A small amount of the obtained polyamic acid solution was fractionated, NMP was added, and the viscosity was measured as a solution having a solid content concentration of 10% by weight, and it was 65 mPa·s. Next, 2,400 g of N-methyl-2-pyrrolidone was added to the obtained polyamic acid solution, 396 g of pyridine and 409 g of acetic anhydride were added, and dehydration ring closure was performed at 110° C. for 4 hours. After the imidization reaction, the solvent in the system is replaced with a new N-methyl-2-pyrrolid...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Boiling pointaaaaaaaaaa
Solution viscosityaaaaaaaaaa
Solution viscosityaaaaaaaaaa
Login to View More

Abstract

The invention provides a liquid crystal oriented agent used for forming a horizontal alignment film, and a liquid crystal display element. Wherein, the liquid crystal oriented agent comprises polymer selected from at least one of polyamide acid and imide polymer of the polyamide acid and mixed solvent. The mixed solvent comprises: a first solvent selected from at least one of N-methyl-2-pyrrolidon, gamma-butyrolactone, 1,3-dimethyl-2-imidazolinone, N,N-dimethylformamide and N,N-dimethylacetamide; a second solvent selected from at least one of Butyl Cellosolve, diacetone alcohol, propylene carbonate, diethylene glycol diethyl ether and ethide-3-ethoxypropionate; a third solvent expressed by the following formula (A) and with the weight rate relative to the total solvent weight in the range of 0.1wt% to 15wt%. The formula is R<1>-Z-R<2> (A). R<1> and R<2> are alkyl. Z is -COO-, -O- or -CO-. Wherein, when Z is -COO-, carbon number of R<1> and R<2> totaled in the range of 6 to 9, and when Z is -O-, the carbon number of R<1> and R<2> totaled in the range of 6-10, and when Z is -CO-, the carbon number of R<1> and R<2> totaled 8.

Description

technical field [0001] The present invention relates to a horizontal alignment (TN) type liquid crystal display element and a liquid crystal aligning agent required therefor. More specifically, it is related with the horizontal alignment type liquid crystal display element excellent in coatability, and the liquid crystal aligning agent for forming the horizontal alignment film required for this. Background technique [0002] TN-type liquid crystal display elements are known in the past. The TN-type liquid crystal display elements have a TN-type liquid crystal cell. The dielectrically anisotropic nematic liquid crystal layer is made into a sandwich-structured cell, and the long axis of the above-mentioned liquid crystal molecules is continuously twisted by 90 degrees from one substrate to the other substrate. [0003] In liquid crystal display elements such as the TN type liquid crystal display element, the alignment of liquid crystals is generally realized by a liquid cryst...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G02F1/1337
CPCC09K19/56G02F1/1337
Inventor 阿部翼林英治西川通则中田正一宫本佳和
Owner JSR CORPORATIOON
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com