Patent ID: 7399842

Claim:
An azo compound represented by the following Formula (I): wherein: R 1 and R 2 respectively independently represent a hydrogen atom, an alkyl group having 1 to 21 carbon atoms, an alkenyl group having 2 to 21 carbon atoms, an aryl group having 6 to 21 carbon atoms or an aralkyl group having 7 to 21 carbon atoms, or R 1 and R 2 may form a hetero ring in combination with a nitrogen atom combined therewith; R 3 represents a halogen atom, a trihalomethyl group, an alkoxy group having 1 to 21 carbon atoms, a nitro group or an unsubstituted or substituted amino group; R 4 represents a halogen atom or a —SO 3 M group, where M represents a cation of a metal atom or a cation made of a nitrogen-containing compound; m denotes an integer from 0 to 5; and n denotes an integer from 0 to 4.