Patent ID: 8758871

Claim:
An alignment control film, adapted to be an alignment control film of a liquid crystal display to drive a liquid crystal with an electric field arising between a pair of electrodes formed on a substrate, comprising a polyamic acid or polyimide that includes cyclobutanetetracarboxylic acid dianhydride and/or its derivative and aromatic diamine; and wherein the cyclobutanetetracarboxylic acid dianhydride and/or its derivative is a compound represented by a formula [1]: where R 1 , R 2 , R 3 and R 4 of the compound of the formula [1] each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, with the proviso that at least one of R 1 , R 2 , R 3 and R 4 of the compound of formula [1] is not hydrogen, wherein the alignment control film has a thickness of from 1 nm to 100 nm, and wherein the aromatic diamine compound contains at least one of compounds selected from a group of compounds consisting of ones represented by formulas [2] to [16]: where R 1 , R 2 , R 3 and R 4 of the compounds represented by formulas [2] to [16] each independently represent a hydrogen atom, a fluorine atom, an alkyl group or alkoxyl group with a carbon number of 1 to 6, or vinyl group {—(CH 2 ) m —CH═CH 2 ,m=0, 1, 2} or a group represented by {—(CH 2 ) n —C≡CH,n=0,1,2}, and in the formula [5], X represents a bond group —S—, —CO—, or —NH—.