Aqueous ink composition

Claim 1

An aqueous ink composition comprising an aqueous solution of a water-soluble first dye component and a humectant dissolved in water, said first dye component being at least one dye selected from the group consisting of a cyan azo dye of formula (I), a magenta azo dye of formula (II), and a yellow azo dye of formula (III); ##STR7## wherein R 1 represents hydrogen, an unsubstituted or substituted amino group, a sulfo-group-substituted alkyl carbamoyl group, a sulfo-group-substituted phenyl carbamoyl group or a sulfo-group-substituted naphthyl carbamoyl group; X 1 represents hydrogen, Na, K, Li or an organic amine; n 1 is an integer of 1 or 2; and n 2 is an integer of 0 through 3; ##STR8## wherein R 2 represents hydrogen or an alkyl group; R 3 and R 4 independently represent hydrogen, an alkyl group, an acyl group, an unsubstituted or substituted phenyl group, or an unsubstituted or substituted phenylsulfonyl group; R 5 and R 6 independently represent hydrogen or an alkyl group; X 2 and X 3 independently represent hydrogen, Na, K, Li or an organic amine; n 3 , n 5 and n 6 each are an integer of 1 or 2; n 8 is an integer of 0 or 1; and n 4 is an integer of 1 through 3; and ##STR9## wherein R 7 represents an alkyl group, an unsubstituted or substituted phenyl group, a cyano group, a hydroxyl group, an alkoxy group, an amino group, an acylamino group, an anilino group, an ureido group, a carbamoyl group, a carboxyl group or an alkyl ester of a carboxyl group; R 8 represents an alkyl group or an unsubstituted or substituted phenyl group; R 9 represents a hydroxyl group or an amino group; R 10 represents hydrogen, an alkyl group, an alkoxy group, a hydroxyl group, halogen or a carboxyl group; R 11 represents an acetyl group, a benzoyl group, a carboxyl group, an alkyl ester of a carboxyl group, a cyano group, or an amido group; Ar represents a sulfo- group-substituted phenyl group or naphthyl group; and n 7 is an integer of 0 through 3.