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Liquid crystal alignment film, manufacturing method of liquid crystal alignment film, and liquid crystal display element
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A technology of liquid crystal alignment film and liquid crystal alignment agent, which is applied in the directions of instruments, optics, nonlinear optics, etc., to achieve the effect of high liquid crystal alignment restriction force, excellent liquid crystal alignment property and orientation restriction force, and damage reduction.
Active Publication Date: 2016-11-16
NISSAN CHEM CORP
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However, the demand for higher performance, higher definition, and larger size of liquid crystal display elements is increasing, and scratches on the surface of the alignment film, dust, mechanical force or static electricity caused by rubbing treatment, and unevenness in the alignment treatment surface Sexuality and other issues are becoming more and more obvious
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[0183] Hereinafter, the present invention will be described in more detail with examples given, but the present invention is not limited thereto.
[0184] The abbreviations of the compounds used in the present examples and comparative examples and the measurement methods of each property are as follows.
[0185] 1,3DM-CBDE-Cl: 1,3-bis(chlorocarbonyl)-1,3-dimethylcyclobutane-2,4-dicarboxylic acid dimethyl ester DA-1: (the following formula (DA-1 ))
[0197] The molecular weight of the polymer was measured with a GPC (normal temperature gel permeation chromatography) device, and the number average molecu...
Synthetic example 1
[0218] A 500 mL four-neck flask equipped with a stirring device was made into a nitrogen atmosphere, 5.00 g (22.39 mmol) of DA-1, 171 g of NMP and 4.00 g (50.52 mmol) of pyridine as a base were added, and stirred to dissolve. Next, stirring this diamine solution, 6.84 g (21.05 mmol) of 1,3DM-CBDE-Cl was added, and it was made to react under water cooling for 4 hours. The obtained polyamic acid ester solution was poured into 847 g of 2-propanol, stirring, and the deposited deposit was collected by filtration. Next, 2-propanol 212g wash|cleaned 5 times, and obtained the white polyamic acid ester resin powder by drying. The molecular weight of this polyamic acid ester is Mn=17451, Mw=40651.
[0219] The obtained polyamic acid ester resin powder 7.50g was taken in the Erlenmeyer flask of 100ml, GBL of 67.50g was added, it stirred and melt|dissolved at room temperature for 24 hours, and obtained the polyamic acid ester solution (PAE-1).
Synthetic example 2
[0221] In the 50ml Erlenmeyer flask with a stirring bar, take 19.58g of the polyamic acid ester solution (PAE-1) obtained in Synthesis Example 1, add 11.82g of GBL, 7.90g of BCS, and 0.28g of Additive A , stirred with a magnetic stirrer for 30 minutes to obtain a liquid crystal aligning agent (A-1).
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Abstract
Provided are: a liquid crystal alignment film which has achieved high anisotropy, good liquid crystal aligning properties and high liquid crystal alignment controlling ability by being irradiated with polarized ultraviolet light having a wavelength of 300 nm or more; and a method for producing the liquid crystal alignment film. A liquid crystal alignment film which is obtained by irradiating a fired film of a liquid crystal aligning agent with polarized ultraviolet light that includes ultraviolet light having a wavelength of from 300 nm to 400 nm (inclusive), said liquid crystal aligning agent containing at least one polymer that is selected from the group consisting of polyimide precursors having a structural unit represented by formula (1) and imidized polymers of the polyimide precursors. (In formula (1), X1 represents a tetravalent organic group having an alicyclic structure; Y1 represents a divalent organic group represented by formula (A); and R1 represents a hydrogen atom or the like. In formula (A), each of A1 and A2 represents at least one group represented by one of formulae (A-1) to (A-5); B1 represents a single bond or the like; and n represents a number of 0-1.) (In formulae (A-1) to (A-5), D represents a protecting group of an amino group, said protecting group being substituted by a hydrogen atom by means of heating.)
Description
technical field [0001] This invention relates to the liquid crystal display element provided with the manufacturing method of a liquid crystal aligning film, the said liquid crystal aligning film, and the said liquid crystal aligning film. In more detail, it relates to a liquid crystal alignment film endowed with a liquid crystal alignment ability by a photo-alignment treatment method instead of a rubbing treatment, a method for manufacturing the liquid crystal alignment film, and a liquid crystal display element having the liquid crystal alignment film. The photo-alignment treatment method refers to It is irradiated with polarized ultraviolet rays, especially polarized ultraviolet rays including ultraviolet rays with a wavelength of 300 nm or more. Background technique [0002] A 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 ...
Claims
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