Patent ID: 7074536

Claim:
An alkylenebisnaphthol derivative represented by formula [I]: wherein Y 1 , Y 2 , Y 1 â€² and Y 2 â€² may be same or different and each of them is selected from the group consisting of a carboxyl group, an esterified carboxyl group, a group of â€”(CONH)n-X (wherein X is an optionally branched and optionally substituted hydrocarbon group which may have an unsaturated bond, an optionally substituted aromatic group and a heterocyclic group having conjugated double bonds, n is an integer of 1 or 2); k is an integer of 1â€“12; R and Râ€² are selected from the group consisting of hydrogen atom, an alkaline metal, an optionally branched and optionally substituted alkyl or acyl group of 1â€“6 carbon atoms and a phenylalkyl group; Q and Qâ€² are selected from the group consisting of an optionally branched alkyl or alkoxy group of 1â€“6 carbon atoms, a halogen atom, nitro group, nitroso group, amino group and sulfo group; and m and mâ€² each represents an integer of 0â€“3 or a salt thereof.