Patent ID: 11966120
Assignee: NISSAN CHEMICAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC G  C | IPC C  G

Claim 0:
1. A liquid crystal light control element that controls a light absorption state by voltage application, the liquid crystal light control element comprising:
a liquid crystal layer containing a liquid crystal composition between a pair of substrates each having an electrode; and
a liquid crystal alignment film that is provided on at least one substrate of the pair of substrates and aligns a liquid crystal vertically,
wherein the liquid crystal composition contains a liquid crystal and a dichroic dye,
the liquid crystal alignment film is obtained from a liquid crystal aligning agent containing a polyimide precursor in which a diamine having at least one structure selected from Formula [1-1] and Formula [1-2] is used as a part of a raw material or a polyimide obtained by imidizing the polyimide precursor, and
a proportion of the diamine used is 50 to 100 mol % based on an entire diamine component in the polyimide precursor or the polyimide:, wherein X1 represents a single bond, —(CH2)a— wherein a is an integer of 1 to 15, —O—, —CH2O—, —CONH—, —NHCO—, —CON(CH3)—, —N(CH3)CO—, —COO—, or —OCO—, X2 represents a single bond or —(CH2)b— wherein b is an integer of 1 to 15, X3 represents a single bond, —(CH2)c, wherein c is an integer of 1 to 15, —O—, —CH2O—, —COO—, or —OCO—, X4 represents a divalent cyclic group selected from a benzene ring, a cyclohexane ring, and a heterocyclic ring, or a C17-C51 divalent organic group having a steroid skeleton, and any hydrogen atom on the cyclic group may be substituted with a C1-C3 alkyl group, a C1-C3 alkoxy group, a C1-C3 fluorine-containing alkyl group, a C1-C3 fluorine-containing alkoxy group, or a fluorine atom, X5 represents a divalent cyclic group selected from a benzene ring, a cyclohexane ring, and a heterocyclic ring, and any hydrogen atom on these cyclic groups may be substituted with a C1-C3 alkyl group, a C1-C3 alkoxy group, a C1-C3 fluorine-containing alkyl group, a C1-C3 fluorine-containing alkoxy group, or a fluorine atom, Xn represents an integer of 0 to 4, and X6 represents a C1-C18 alkyl group, a C2-C18 alkenyl group, a C1-C18 fluorine-containing alkyl group, a C1-C18 alkoxy group, or a C1-C18 fluorine-containing alkoxy group,

—X7—X8   [1-2]

wherein X7 represents a single bond, —O—,—CH2O—, —CONH—, —NHCO—, —CON(CH3)—, —N(CH3)CO—, —COO—, or —OCO— and X8 presents a C8-C22 alkyl group or a C6-C18 fluorine-containing alkyl group, and
wherein a content of of the dichroic dye in the liquid crystal composition is from 0.01 to 10 parts by mass based upon 100 parts by mass of the liquid crystal.