Patent ID: 7014308
Filing Date: 2006-03-21
Classification: C09D

Abstract:
1. An ink set comprising a plurality of inks each comprising at least a water soluble dye, a water miscible organic solvent and water, wherein: (1) each of the water miscible organic solvents permits all of the dyes to have a solubility at 25° C. of less than 10 (g/100 g); or (2) at least one of the water miscible organic solvents permits at least one of the dyes to have a solubility at 25° C. of 10 (g/100 g) or greater, but a total amount of the at least one of the water miscible organic solvents is 10% by weight or less based on each one of the inks; and (3) at least one of the water soluble dyes is a magenta dye represented by the following formula (1): wherein, A represents a 5-membered heterocyclic group; B 1 and B 2 each represents ═CR 1 — or —CR 2 ═, or one of B 1 and B 2 represents a nitrogen atom and the other represents ═CR 1 — or —CR 2 ═; R 5 and R 6 each independently represents a hydrogen atom or a substituent, the substituent is an aliphatic group, an aromatic group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkylsulfonyl group, an arylsulfonyl group or a sulfamoyl group, and a hydrogen atom of each of the substituents may be substituted; and G, R 1 , and R 2 each independently represents a hydrogen atom or a substituent, the substituent is a halogen atom, an aliphatic group, an aromatic group, a heterocyclic group, a cyano group, a carboxyl group, a carbamoyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a heterocyclic oxycarbonyl group, an acyl group, a hydroxy group, an alkoxy group, an aryloxy group, a heterocyclic oxy group, a silyloxy group, an acyloxy group, a carbamoyloxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an amino group, an acylamino group, a ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkylsulfonylamino group, an arylsulfonylamino group, a heterocyclic sulfonylamino group, a nitro group, an alkylthio group, an arylthio group, a heterocyclic thio group, an alkylsulfonyl group, an arylsulfonyl group, a heterocyclic sulfonyl group, an alkylsulfinyl group, an arylsulfinyl group, a heterocyclic sulfinyl group, a sulfamoyl group or a sulfo group, and a hydrogen atom of each of the substituents may be substituted; and R 1 and R 5 , or R 5 and R 6 may be coupled to form a 5- or 6-membered ring.