Liquid crystal aligning agent, liquid crystal alignment film and liquid crystal display element

A technology of liquid crystal aligning agent and solvent, which is applied in the direction of liquid crystal materials, instruments, chemical instruments and methods, etc., can solve problems such as difficult to obtain reliable liquid crystal display elements, and achieve excellent display characteristics, excellent performance of pretilt angle, and liquid crystal orientation good effect

CN110546560AActive Publication Date: 2019-12-06NISSAN CHEM IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-12-06

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Abstract

The present invention provides: a liquid crystal alignment film which exhibits good liquid crystal aligning properties even if the firing time thereof is shortened, while achieving excellent pretilt angle imparting ability and high reliability; and a liquid crystal aligning agent. The present invention provides: a liquid crystal aligning agent which contains a solvent and a component (A) that is apolymer having structures (A-1) and (A-2), wherein the polymer additionally has a structure (A-3) that has at least one functional group selected from among an oxetanyl group, an oxiranyl group, a group represented by formula (3), a group represented by formula (4), a group represented by formula (5) and a thiirane group; and / or the liquid crystal aligning agent which additionally contains a component (B) other than the component (A), and the component (B) is a compound that has two or more groups in each molecule, said groups being selected from the group consisting of an epoxy group, a thiirane group, a hydroxyalkylamide group, and a benzyl alcohol group. (A-1) is a structure that has at least one functional group in each molecule, said functional group being selected from among a carboxyl group, an amino group and a hydroxyl group. (A-2) is a structure that is represented by formula (pa-1) (wherein the symbols are as defined in the description).
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Description

technical field

[0001] This invention relates to the liquid crystal display element provided with the liquid crystal aligning agent, the liquid crystal aligning film obtained by this, and the obtained liquid crystal aligning film. More specifically, it relates to a liquid crystal aligning agent capable of providing a liquid crystal aligning film with good liquid crystal orientation, excellent pretilt angle expressability, and high reliability even when the firing temperature is low and the firing time is short. Indicates a high-quality liquid crystal display element. Background technique

[0002] In a liquid crystal display element, a liquid crystal aligning film is responsible for aligning a liquid crystal in a constant direction. Now, the main liquid crystal aligning film used in industry is polyimide formed by adding a solution containing polyamic acid (also known as polyamic acid), polyamic acid ester, and polyimide as a precursor of polyimide. The amine-based liquid c...

Examples

Embodiment

[0284] As a monomer having a photo-alignment group used in the examples (hereinafter referred to as "photo-alignment monomer"), monomers represented by "MA-1" and "MA-2" are as follows, as A monomer having a polar group (hereinafter referred to as "polar monomer"), a monomer represented by "MAA" or "VBA" is as follows, as a monomer having a crosslinkable group (hereinafter referred to as "cross-linking monomer"), the monomer represented by "GMA" is as follows, as the compound (B) component (hereinafter referred to as "cross-linking agent component"), "TETRAD-C" or " The structure of the compound represented by YH-434-L" is shown below.

[0285] In addition, "MA-2" was synthesize|combined by the synthesis method described in the following synthesis example 1. "MAA (methacrylic acid)", "VBA (vinylbenzoic acid)", "MMA", "C18", "TETRAD-C" and "YH-434-L" used commercially available reagents.

[0286] (photo-alignment monomer)

[0287]

[0288] (polar monomer)

[...

Synthetic example A1

[0339] Dissolve MA-2 (2.48 g, 6.01 mmol), GMA (0.14 g, 1.00 mmol) and MAA (1.2 g, 13.0 mmol) in CHN (11.0 g) and PGME (11.0 g) using a diaphragm pump After degassing, AIBN (0.2 g, 1.0 mmol) was added as a polymerization initiator, and degassing was performed again. Then, it was made to react at 60 degreeC for 13 hours, and the polymer solution (MP-1) was obtained.

[0340] The polymer had a number average molecular weight of 40,500 and a weight average molecular weight of 138,300.

Synthetic example A2～A10

[0341]

[0342] With the composition shown in Table 1, methacrylate polymers PA2-PA10 and PA11-PA18 were synthesized by the method similar to polymer synthesis example A1.

[0343]