Patent ID: 7399349

Claim:
An ink for ink jet recording, which comprises a dye, water, a water-miscible organic solvent and a compound represented by the following formula (1): (R k ) p -N-[L m -(COOM n ) q ] r (1) wherein R represents an alkyl group, an aryl group or a heterocyclic group; when a plural number of R's are present, the plurality of R's may be the same or different; at least two of a plurality of R's may be linked with each other to form a cyclic structure; L represents a divalent or higher linking group; M represents a hydrogen atom, an alkali metal cation, an ammonium ion, an organic amine cation, or a negative ion sign; q and r each represents an integer of 1 or more; k and m each represents 0 or an integer of 1 or more; n represents an integer of 1 or more; p represents 0 or an integer of 1 or more; (p+r) is 3 or 4, when (p+r) is 4, the N atom represents a quaternary ammonium cation and one of the M's represents a negative ion sign, and wherein the dye includes a compound represented by the following formula: wherein A represents a 5-membered heterocyclic group; B 1 and B 2 each represents a nitrogen atom, ═CR 1 - or —CR 2 ═, and when either one of B 1 and B 2 represents a nitrogen atom, the other represents ═CR 1 - or —CR 2 ═; R 5 and R 6 each 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 alkylsulfonyl group, an arylsulfonyl group or a sulfamoyl group, and the hydrogen atom of each substituent may be substituted; G, R 1 and R 2 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 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 the hydrogen atom of each substituent may be substituted; and R 1 and R 5 , or R 5 and R 6 may combine to form a 5- or 6-membered ring.