Patent ID: 7862747

Claim:
An arylsulfonic acid compound represented by the following formula (1): wherein, X represents O or S, A represents a naphthalene or anthracene ring which may contain one or more substituents other than X and (SO 3 H)n, B represents an unsubstituted or substituted hydrocarbon group, a 1,3,5-triazine group, or an unsubstituted or substituted group represented by the following formula (3) or (4); wherein W 1 and W 2 each independently represents O, S, an S(O) group, an S(O 2 ) group, or an unsubstituted or substituted N, Si, P or P(O) group, n indicates a number of sulfonic acid group(s) bonded to A, and stands for an integer satisfying 1â‰¦nâ‰¦4, q indicates a number of Bâ€”X bond(s), and stands for an integer satisfying 2â‰¦q.