Composition for forming dye type polarizer and dye type polarizer

A composition for forming a dye-type polarizer, comprising:

• a curable anisotropic dye of the following Chemical Formula 1;
• and
• an orientation auxiliary agent of the following Chemical Formula 2 or a radical polymer thereof,
• wherein a weight ratio between the curable anisotropic dye and the orientation auxiliary agent is 1:95 to 25:50, and
• wherein the curable anisotropic dye and the orientation auxiliary agent forms a crosslinking structure in the dye-type polarizer,
• wherein the dye-type polarizer comprising a dye layer including a cured product of the composition for forming a dye-type polarizer, wherein the dye layer has a dichroic ratio of 10 or higher, and a degree of polarization of the dye-type polarizer is 90 or higher, and a reduction rate of degree of polarization after heat treatment at 80° C. for 48 hours is 10% or less:
• wherein n is an integer of 2 to 5, in which two or more of a repeating unit of —(A1-N═N)— are the same as or different from each other, respectively,
• at least one of Q1 and Q2 is a curable unsaturated functional group, and the other is hydrogen, alkyl having 1 to 20 carbon atoms, alkoxy having 1 to 20 carbon atoms, alkylester having 1 to 20 carbon atoms, or amine,
• A1 and A2 are the same as or different from each other, and are substituted or unsubstituted arylene having 6 to 40 carbon atoms, or substituted or unsubstituted heteroarylene having 4 to 30 carbon atoms,
• B1 and B2 are the same as or different from each other, and are a divalent functional group in a combination of one or more selected from the group consisting of a single bond, —(C═O)O—, —O(C═O)—, substituted or unsubstituted alkylene having 1 to 20 carbon atoms, substituted or unsubstituted arylene having 6 to 40 carbon atoms, substituted or unsubstituted heteroarylene having 4 to 30 carbon atoms, substituted or unsubstituted alkyleneoxide having 1 to 20 carbon atoms, —O—, —S—, —NR1— and —PR1—, and
• R1 is hydrogen or alkyl having 1 to 20 carbon atoms,
• Q3-B3-A3-N═N-A4-B4-Q4 [Chemical Formula 2]
• wherein at least one of Q3 and Q4 is a curable unsaturated functional group, and the other is hydrogen, alkyl having 1 to 20 carbon atoms, alkoxy having 1 to 20 carbon atoms, alkylester having 1 to 20 carbon atoms, —CN, —NO2, halogen, or amine unsubstituted or substituted with 1 or 2 of alkyl having 1 to 6 carbon atoms,
• A3 and A4 are the same as or different from each other, and are substituted or unsubstituted arylene having 6 to 40 carbon atoms, or substituted or unsubstituted heteroarylene having 4 to 30 carbon atoms,
• B3 and B4 are the same as or different from each other, and are a divalent functional group in a combination of one or more selected from the group consisting of a single bond, —(C═O)O—, —O(C═O)—, substituted or unsubstituted alkylene having 1 to 20 carbon atoms, substituted or unsubstituted arylene having 6 to 40 carbon atoms, substituted or unsubstituted heteroarylene having 4 to 30 carbon atoms, substituted or unsubstituted alkyleneoxide having 1 to 20 carbon atoms, —O—, —S—, —NR2— and —PR2—, and
• R2 is hydrogen or alkyl having 1 to 20 carbon atoms.