Patent ID: 7247194
Filing Date: 2007-07-24
Classification: C09B,C09D

Abstract:
1. An ink jet ink comprising at least water, a water-soluble organic solvent and a coloring material, wherein the coloring material is a compound represented by the following general formula (1) or a salt thereof; a content (mass %) of the coloring material is 0.5 mass % or more and less than 3.0 mass % with respect to a total mass of the ink jet ink; and a content (mass %) of 2-pyrrolidone in the water-soluble organic solvent is 50.0% or more with respect to the content (mass %) of the coloring material; and in a dispersion distance distribution, measured by a small-angle X-ray scattering method, of molecular aggregates in the ink jet ink whose coloring material concentration is adjusted to 0.5 mass %, a dispersion distance d wherein M represents an alkali metal or ammonium; R 1 and R 2 each independently represent a hydrogen atom, a sulfonic group, or a carboxyl group provided that R 1 and R 2 are not simultaneously a hydrogen atom; Y represents a chlorine atom, a hydroxyl group, an amino group, or a monoalkylamino or dialkylamino group; 1 represents 0 to 2, m represents 1 to 3, and n represents 1 to 3 provided that 1+m+n=3 to 4); and positions at which substituents are present are the 4- or 4′-positions.