US 11,807,794 B2
Liquid crystal alignment agent and preparation method thereof, liquid crystal alignment film and preparation method thereof, and liquid crystal cell
Shenglin Wang, Shenzhen (CN); Houming Li, Shenzhen (CN); and Jianghua Su, Shenzhen (CN)
Assigned to SHENZHEN DALTON ELECTRONIC MATERIAL CO., LTD, Shenzhen (CN)
Appl. No. 17/772,567
Filed by SHENZHEN DALTON ELECTRONIC MATERIAL CO., LTD, Shenzhen (CN)
PCT Filed Oct. 22, 2021, PCT No. PCT/CN2021/125583
§ 371(c)(1), (2) Date Apr. 28, 2022,
PCT Pub. No. WO2022/095722, PCT Pub. Date May 12, 2022.
Claims priority of application No. 202011210131.4 (CN), filed on Nov. 3, 2020.
Prior Publication US 2023/0167365 A1, Jun. 1, 2023
Int. Cl. G02F 1/1337 (2006.01); G02F 1/1339 (2006.01); C09K 19/56 (2006.01); C08G 73/10 (2006.01); C08J 5/18 (2006.01)
CPC C09K 19/56 (2013.01) [C08G 73/1032 (2013.01); C08G 73/1042 (2013.01); C08G 73/1078 (2013.01); C08J 5/18 (2013.01); G02F 1/133711 (2013.01); G02F 1/133784 (2013.01); C08J 2379/08 (2013.01); G02F 1/1339 (2013.01); G02F 1/13392 (2013.01); G02F 2202/28 (2013.01)] 32 Claims
 
1. A liquid crystal alignment agent, comprising a diamine monomer, a dianhydride monomer, a piperazine monomer, and a solvent, wherein the piperazine monomer has a general structural formula of

OG Complex Work Unit Chemistry
wherein R represents an amino group or an anhydride group;
the diamine monomer comprises a first diamine compound and a second diamine compound;
the first diamine compound comprises at least one from the group consisting of compounds shown in general structural formulas I and II:

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in the general structural formula I, A represents a chemical bond, an alkyl chain CnH2n, —O—, —NH—, —S—, or —SO2—, wherein n=1-20; and R represents —H or —CH3;

OG Complex Work Unit Chemistry
in the general structural formula II, R represents —H or —CH3;
the second diamine compound comprises at least one from the group consisting of compounds shown in general structural formulas III and TV:

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in the general structural formula TIT, R represents an alkyl chain CnH(2n+1), wherein n=1-50;

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in the general structural formula IV, R represents an alkyl chain CnH(2n+1), wherein n=1-50.