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

Liquid-crystal alignment material for use in photo-alignment method, liquid-crystal alignment film, and liquid-crystal display element

A technology of liquid crystal aligning agent and liquid crystal aligning film, which is applied in the field of liquid crystal aligning film, liquid crystal aligning film, liquid crystal display element and liquid crystal display element, and can solve the problem of afterimage of liquid crystal display element, small anisotropy of polymer film, and inability to obtain Sufficient liquid crystal orientation and other issues to achieve the effect of reducing afterimage and good afterimage characteristics

Active Publication Date: 2015-03-04
NISSAN CHEM IND LTD
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, the liquid crystal aligning film obtained by the photo-alignment method has a problem that the anisotropy with respect to the orientation direction of the polymer film is smaller than that of the liquid crystal aligning film obtained by rubbing.
If the anisotropy is small, sufficient liquid crystal orientation cannot be obtained, and problems such as image sticking may occur when it is made into a liquid crystal display element

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 material for use in photo-alignment method, liquid-crystal alignment film, and liquid-crystal display element
  • Liquid-crystal alignment material for use in photo-alignment method, liquid-crystal alignment film, and liquid-crystal display element
  • Liquid-crystal alignment material for use in photo-alignment method, liquid-crystal alignment film, and liquid-crystal display element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0152] Hereinafter, the present invention will be described in more detail with examples given, but the present invention is not limited thereto. The abbreviations of the compounds used in the present examples and comparative examples and the measurement methods of each property are as follows.

[0153] NMP: N-methyl-2-pyrrolidone

[0154] BCS: Butyl Cellosolve

[0155] DA-2: the following formula (DA-2)

[0156] DA-3: the following formula (DA-3)

[0157] DAH-1: the following formula (DAH-1)

[0158] Additive A: N-α-(9-fluorenylmethoxycarbonyl)-N-τ-tert-butoxycarbonyl-L-histidine

[0159] [chem 21]

[0160]

[0161] [viscosity]

[0162] In the synthesis example, the viscosity of the polyimide precursor solution was measured using an E-type viscometer TVE-22H (manufactured by Toki Sangyo Co., Ltd. (Toki Sangyo Co., Ltd.)) with a sample volume of 1.1 mL and a conical rotor TE-1 ( 1°34', R24), measured under the conditions of temperature 25°C.

[0163] [molecular weig...

Synthetic example 1

[0189] 4.89 g (20.02 mmol) of 1,2-bis(4-aminophenoxy)ethane and 69.75 g of NMP were added to a 100 mL four-necked flask equipped with a stirring device and a nitrogen introduction tube, while supplying nitrogen. Stir to dissolve. While stirring this diamine solution, 3.72 g (18.97 mmol) of 1,2,3,4-cyclobutanetetracarboxylic dianhydride was added, and NMP was further added to make the solid content concentration 10% by mass, and the mixture was stirred at room temperature for 24 hours. hours, a solution of polyamic acid (PAA-1) was obtained. The viscosity of the polyamic acid solution at a temperature of 25°C was 143 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=12777 and Mw=29720.

Synthetic example 2

[0191] 110.47 g (452 ​​mmol) of 1,2-bis(4-aminophenoxy)ethane and 18.94 g (79.5 mmol) of DA- 2. 1587 g of NMP was added and dissolved while stirring while supplying nitrogen gas. While stirring this diamine solution, 111.18 g (496 mmol) of 1,3-dimethyl-1,2,3,4-cyclobutanetetracarboxylic dianhydride was added, and NMP was further added to make the solid content concentration 12 mass %, it stirred at 40 degreeC for 20 hours, and obtained the solution of polyamic acid (PAA-2). The viscosity of the polyamic acid solution at a temperature of 25°C was 183 mPa·s. In addition, the molecular weight of this polyamic acid was Mn=12356 and Mw=25544.

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
Sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Film thicknessaaaaaaaaaa
Login to View More

Abstract

Provided are: a liquid-crystal alignment material for obtaining liquid-crystal alignment films which are for use in the photo-alignment method and which, even when cleaned with a cleaning fluid, satisfactorily reduce the occurrence of image persistence; a liquid-crystal alignment film; and a liquid-crystal display element. The liquid-crystal alignment material for the photo-alignment method comprises: at least one polymer selected from among polyimide precursors represented by formula (1) and polymers obtained by imidizing the polyimide precursors; and an organic solvent. (X1 is a tetravalent organic group having a specific structure and R1 is a hydrogen atom or a C1-4 alkyl group.)

Description

technical field [0001] The present invention relates to a liquid crystal aligning agent for producing a liquid crystal aligning film, a liquid crystal aligning film obtained from the liquid crystal aligning agent, and a liquid crystal display element. Specifically, it relates to a liquid crystal aligning agent for forming a liquid crystal aligning film capable of imparting liquid crystal alignment ability by a photo-alignment treatment method in place of rubbing treatment, that is, by irradiating polarized ultraviolet rays, a liquid crystal aligning film obtained from the liquid crystal aligning agent, and Liquid crystal display element. Background technique [0002] The liquid crystal display element used for a liquid crystal television, a liquid crystal display, etc. is normally provided with the liquid crystal aligning film for controlling the orientation state of a liquid crystal in the element. [0003] At present, according to the most common method in the industry, t...

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): G02F1/1337C08G73/10
CPCC08G73/105C08G73/1078C09D179/08G02F1/133723
Inventor 作本直树山极大辉
Owner NISSAN CHEM IND LTD
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