Patent ID: 7176330

Claim:
A fluorescent group-containing carbodiimide compound precursor having a halogen atom or a sulfonic acid group which is represented by the following general formula (I): B—Y 3 —N═C═N—Y 2 —W—Y 1 -{A} n -Y 4 - x (I) Wherein, X represents a halogen atom or a sulfonic acid group; A represents a functional group selected from the group consisting of —CH 2 —, —NHCO—, —CONH—, —O—, —S—, —NR 1 — wherein R 1 represents a linear, cyclic or branched saturated or unsaturated aliphatic hydrocarbon group having 1–20 carbon atoms, —NR 2 R 3 — wherein R 2 and R 3 each independently represent a hydrogen atom, a linear or branched saturated or unsaturated aliphatic hydrocarbon group having 1–20 carbon atoms, or a cycloalkyl group, an aryl group or an aralkyl group which may have a substituent, provided that when one of R 2 and R 3 is a hydrogen atom, the other represents a linear or branched saturated or unsaturated aliphatic hydrocarbon group having 1–20 carbon atoms, or a cycloalkyl group, an aryl group or an aralkyl group which may have a substituent, or R 2 and R 3 may be bonded to each other to form as a whole a nitrogen-containing heterocyclic group which may contain an oxygen atom, —COO—, —OCO—, —NHSO 2 —, —NHC(S)NH— and SO 2 NH—; n represents 0 or 1; W represents a direct bond or a quaternary onium group; Y 1 , Y 2 , Y 3 and Y 4 each represent a functional group represented by the general formula (II): —(CH 2 ) p -(L) r -(CH 2 ) q — (II) wherein, L represents a functional group selected from the group consisting of —CH 2 —, —NHCO—, —CONH—, —O—, —S—, —NR 1 — wherein R 1 has the same meaning as defined for the formula (I), —NR 2 R 3 — wherein R 2 and R 3 have the same meanings as defined for the formula (I), —COO, —OCO—, —NHSO 2 —, —NHC(S)NH— and SO 2 NH—; p and q each represent an integer of from 0 to 20; and r represents 0 or 1; B represents a hydrogen atom or a monovalent organic group; and Any of the functional groups represented by B, Y 1 , Y 2 , Y 3 , Y 4 , A and W may contain a group selected from a carboxyl group, a sulfo group, a phosphono group and a phospho group which have substitution of an alkali metal, an alkaline earth metal or a basic group containing a nitrogen or phosphorus atom.