Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which has favorable seal adhesion and a favorable residual image property, and which is excellent in removability of a decomposed product formed after irradiation with ultraviolet rays. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having structural units represented by the formula (1) and structural units represented by the formula (2) and an imidized polymer of the polyimide precursor: wherein X1 and X2 are a tetravalent organic group, Y1 and Y2 are a bivalent organic group, and R1 and R2 are a hydrogen atom or a C1-5 alkyl group.

Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which is excellent in the adhesion to a sealing agent and in the liquid crystal alignment property. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having structural units represented by the formula (1) and structural units represented by the formula (3) and an imidized polymer of the polyimide precursor: wherein X1 and X4 are a tetravalent organic group, Y1 is a bivalent organic group having a thermally-leaving group, Y2 is a bivalent organic group, R1 and R2 are a hydrogen atom or a C1-5 alkyl group, and Z1 and Z2 are a hydrogen atom, or a C1-10 alkyl group, C2-10 alkenyl group or C2-10 alkynyl group which may have a substituent.

Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which is excellent in the adhesion to a sealing agent and a substrate of a liquid crystal display device, and of which a decomposed product formed after irradiation with ultraviolet rays will easily be removed. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having a bond represented by the following formula (1) in its main chain and an imidized polymer of the polyimide precursor: wherein each of R1, R2, R3 and R4 which are independent of one another, is a hydrogen atom or a C1-20 monovalent hydrocarbon group which may have a substituent, and D is a protecting group to be replaced with a hydrogen atom by heat.

Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which is excellent in the adhesion to a sealing agent and a substrate of a liquid crystal display device, and of which a decomposed product formed after irradiation with ultraviolet rays will easily be removed. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having a bond represented by the following formula (1) in its main chain and an imidized polymer of the polyimide precursor: wherein each of R1, R2, R3 and R4 which are independent of one another, is a hydrogen atom or a C1-20 monovalent hydrocarbon group which may have a substituent, and D is a protecting group to be replaced with a hydrogen atom by heat.

Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which is excellent in the adhesion to a sealing agent and in the liquid crystal alignment property. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having structural units represented by the formula (1) and structural units represented by the formula (3) and an imidized polymer of the polyimide precursor: wherein X1 and X4 are a tetravalent organic group, Y1 is a bivalent organic group having a thermally-leaving group, Y2 is a bivalent organic group, R1 and R2 are a hydrogen atom or a C1-5 alkyl group, and Z1 and Z2 are a hydrogen atom, or a C1-10 alkyl group, C2-10 alkenyl group or C2-10 alkynyl group which may have a substituent.

Abstract: To provide a liquid crystal aligning agent to obtain a liquid crystal alignment film which has favorable seal adhesion and a favorable residual image property, and which is excellent in removability of a decomposed product formed after irradiation with ultraviolet rays. A liquid crystal aligning agent containing at least one polymer selected from the group consisting of a polyimide precursor having structural units represented by the formula (1) and structural units represented by the formula (2) and an imidized polymer of the polyimide precursor: wherein X1 and X2 are a tetravalent organic group, Y1 and Y2 are a bivalent organic group, and R1 and R2 are a hydrogen atom or a C1-5 alkyl group.