Liquid crystal alignment agent and uses thereof

A liquid crystal alignment agent comprising:

• a polymer (A) obtained by reacting a mixture comprising a tetracarboxylic acid dianhydride component (a) and a diamine component (b);
• a benzotriazole compound (B);
• and
• a solvent (C);
• wherein the benzotriazole compound (B) comprises at least one hydroxyl group;
• the diamine component (b) comprises at least one diamine compound (b-1) represented by Formula (I), and an other diamine compound (b-2):
• wherein,
• R14 represents
• R15 represents an organic group represented by Formula (I-1);
• wherein, R16 represents a hydrogen atom, a fluorine atom or a methyl group;
• R17, R18 or R19 each independently represents a single bond,
• or a C1-C3 alkylene group;
• R20 represents
• wherein R22 and R23 each independently represent a hydrogen atom, a fluorine atom or a methyl group;
• r and s each independently represent 1 or 2;
• when R22 or R23 is plural, R22 or R23 respectively is the same or different;
• R21 represents a hydrogen atom, a fluorine atom, a C1-C12 alkyl group, a C1-C12 fluoroalkyl group, a C1-C12 alkoxy group, — OCH2F, —OCHF2 or —OCF3;
• k represents 1 or 2;
• l, m and n each independently represent an integer from 0 to 4;
• o, p and q each independently represent an integer from 0 to 3, and o+p+q≧3;
• when R16, R17, R18, R19 or R20 is plural, R16, R17, R18, R19 or R20 respectively is the same or different.