Patent ID: 7022170
Filing Date: 2006-04-04
Classification: C09D

Abstract:
1. An ink for ink jet recording, which comprises a dye having: a λmax in an aqueous solution of from 390 nm to 470 nm; and a I(λmax+70 nm)/I(λmax) ratio of not more than 0.4, in which I(λmax) is the absorbance at λmax and I(λmax+70 nm) is the absorbance at (λmax+70 nm), the dye being dissolved and/or dispersed in an aqueous medium, and the dye is represented by formula (1), wherein A and B each independently represents a heterocyclic group which may be substituted, wherein the ink has a forced fading rate constant of not greater than 5.0×10 the total amount of a cation in said ink except for a monovalent metal ion, a hydrogen ion, an ammonium ion, an organic quaternary nitrogen ion and an ion produced by the proton addition to a nitrogen atom in a basic organic material is 0.5 wt % or less.