| 主权项 |
1. An optical absorption anisotropic film,
wherein content of a liquid crystalline non-colorable low molecular weight compound is 30% by mass or less; and which is obtained by fixing the alignment of a dichroic dye composition comprising at least two types of azo-based dichroic dye having nematic liquid crystallinity; and shows a diffraction peak derived from a periodic structure in a direction parallel to the alignment axis on measurement of X-ray diffraction, wherein the dichroic dye composition comprises at least one type of compound expressed by the formula (Ia), formula (Ib) or formula (II) shown below and at least one type of compound expressed by the formula (III) or formula (IV) shown below; wherein R17a and R18a each represent independently a hydrogen atom, a methyl group or an ethyl group; L11a represents —N═N—, —N═CH—, —O(C═O)— or —CH═CH—; A11a represents a group represented by the following formula (Ia-II) or (Ia-III); B11a and B12a each represent independently a group represented by the following formula (Ia-IV), (Ia-V) or (Ia-VI); wherein R19a represents an alkyl group optionally having a substituent, an aryl group optionally having a substituent, an alkoxy group optionally having a substituent, an oxycarbonyl group optionally having a substituent or an acyloxy group optionally having a substituent; wherein m represents an integer of 0 to 2, wherein R17b and R18b each represent independently a hydrogen atom, a methyl group or an ethyl group; L11b represents —N═N— or —(C═O)O—; L12b represents —N═CH—, —(C═O)O— or —O(C═O)—; A11b represents a group represented by the following formula (Ib-II) or (Ib-III); m represents an integer of 0 to 2; wherein R19b represents an alkyl group optionally having a substituent, an aryl group optionally having a substituent, an alkoxy group optionally having a substituent, an oxycarbonyl group optionally having a substituent or an acyloxy group optionally having a substituent, wherein, R21 and R22 each represent a hydrogen atom, an alkyl group, an alkoxy group or a substituent represented by -L22-Y, provided that, at least one of them represents a group other than a hydrogen atom; L22 represents an alkylene group, and one CH2 group or non-adjacent two or more CH2 groups present in the alkylene group may each be substituted with —O—, —COO—, —OCO—, —OCOO—, —NRCOO—, —OCONR—, —CO—, —S—, —SO2—, —NR—, —NRSO2— or —SO2NR— wherein R represents a hydrogen atom or an alkyl group having 1 to 4 carbons; Y represents a hydrogen atom, a hydroxy group, an alkoxy group, a carboxyl group, a halogen atom or a polymerizable group; L21s each represent a linking group selected from the group consisting of an azo group (—N═N—), a carbonyloxy group (—C(═O)O—), an oxycarbonyl group (—O—C(═O)—), an imino group (—N═CH—) and a vinylene group (—C═C—); dyes each represent an azo dye residue represented by the following formula (IIa);in the formula (IIa), * represents a linkage part to L21; X21 represents a hydroxy group, a substituted or un-substituted alkyl group, a substituted or un-substituted alkoxy group, an un-substituted amino group or a mono or dialkylamino group; Ar21s each represent an aromatic hydrocarbon ring group optionally having a substituent or aromatic heterocyclic group optionally having a substituent; n represents an integer of 1 to 3, and when n is 2 or more, two Ar21s may be mutually the same or different;wherein, R31 to R35 each represent independently a hydrogen atom or a substituent; R36 and R37 each represent independently a hydrogen atom or an alkyl group optionally having a substituent; Q31 represents an aromatic hydrocarbon group, aromatic heterocyclic group optionally having a substituent or cyclohexane ring group optionally having a substituent; L31 represents a divalent linking group; A31 represents an oxygen atom or a sulfur atom;wherein, R41 and R42 each represent a hydrogen atom or a substituent, and may be mutually linked to form a ring; Ar4 represents an optionally substituted divalent aromatic hydrocarbon group or aromatic heterocyclic group; R43 and R44 each represent a hydrogen atom or an optionally substituted alkyl group, and may be mutually linked to form a hetero ring. |
