DIAMINOBENZENE DERIVATIVE AND POLYIMIDE USING THE SAME, AND ORIENTED LIQUID CRYSTAL FILM

摘要

PROBLEM TO BE SOLVED: To obtain the subject new compound as a raw material for producing a polyimide having a high tilt angle and useful in oriented liquid crystal film for a liquid crystal display element. SOLUTION: This compound is expressed by formula I (P is a single bond or a divalent (organic)group such as O; Q is an aromatic ring etc.; R<1> is an aliphatic ring; R<2> is a 1∼22C straight-chain alkyl), e.g. 4-(4-trans-n- heptylcyclohexylphenoxy)-1,3-diaminobenzene. Reduction of nitro groups of the corresponding dinitro compound gives this compound. Ring closure of a polyimide precursor obtained by reaction of this compound with a tetracarboxylic acid or its derivative gives a polyimide having a repeating unit expressed by formula II (A is a tetravalent organic groups forming the tetracarboxylic acid; B is a divalent organic group forming a diamine).