Patent ID: 6875878

Claim:
A chromene compound represented by the following formula (1), wherein R 1 , R 2 , R 3 and R 4 are, independently from each other, hydrogen atoms, hydroxyl groups, alkyl groups, alkoxy groups, aralkyl groups, aralkoxy groups, amino groups, substituted amino groups, cyano groups, nitro groups, halogen atoms, halogenoalkyl groups or halogenoalkoxy groups, R 1 and R 2 together, and R 3 and R 4 together, may form rings, and either R 1 or R 2 and either R 3 or R 4 together may form a ring, R 5 and R 6 are, independently from each other, alkyl groups, substituted or unsubstituted aryl groups, or substituted or unsubstituted heteroaryl groups, or R 5 and R 6 together may form a ring, a trivalent cyclic group represented by the following formula (2), and a trivalent cyclic group represented by the following formula (3), are, independently from each other, substituted or unsubsttituted aromatic hydrocarbon groups or substituted or unsubstituted aromatic heterocyclic groups, and a divalent group Z is presented by the following formula (4) or (5), wherein R 7 , R 8 and R 9 are, independently from each other, alkylene groups, B and B′ are, independently from each other, imino groups, substituted imino groups, oxy groups, thio groups, carbonyl groups, cycloalkylene groups, cycloalkylidene groups, or substituted or unsubstituted arylene groups, and m, n, p and q are 0 or 1.