Patent ID: 6835240
Filing Date: 2004-12-28
Classification: C09D

Abstract:
An ink composition for inkjet recording comprising:an azo dye having an aromatic nitrogen-containing 6-membered heterocycle as a coupling component; an aqueous medium; and a surfactant, wherein the azo dye is dissolved or dispersed in the aqueous medium, herein the azo dye is represented by the following formula (A-1): â€ƒwherein A represents a 5-membered heterocyclic group; B1 and B2 represent &boxH;CR1â€” and â€”CR2&boxH;, respectively, or either one represents a nitrogen atom and the other one represents â€”CR1&boxH; or â€”CR2&boxH;; R5 and R6 each independently represents a hydrogen atom, an aliphatic group, an aromatic group, a heterocyclic group, an acyl group, an alkoxycarbonyl group, an aryloxycarbonyl group, a carbamoyl group, an alkyl- or aryl-sulfonyl group or a sulfamoyl group, which may each have a further substituent: G, R1, and R2 each independently represents a hydrogen atom, 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 hydroxyl group, an alkoxy group, an aryloxy group, a silyloxy group, an acyloxy group, a carbamoyloxy group, a heterocyclic oxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an amino group, an acylamino group, an ureido group, a sulfamoylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, an alkyl- or aryl-sulfonylamino group, a heterocyclic sulfonylamino group, a nitro group, an alkyl- or aryl-thio group, an alkyl- or aryl-sulfonyl group, a heterocyclic sulfonyl group, an alkyl- or aryl-sulfinyl group, a heterocyclic sulfinyl group, a sulfamoyl group, a sulfo group, or a heterocyclic thio group, which may each have a further substituent; and a pair R1 and R5 or a pair R5 and R6 may be coupled to form a 5- or 6-membered ring.