Patent ID: 6099627
Filing Date: 2000-08-08
Classification: C09D

Abstract:
A dispersion ink comprising at least a pigment or a disperse dye, which has a particle diameter of 75 nm or less, an amphiphilic compound, and water, said amphiphilic compound having a hydrophilic portion composed of a poly(ethylene oxide) and a hydrophobic portion composed of an alkyl group and/or an aromatic group and bonded to the hydrophilic portion, said amphiphilic compound containing at least one ionic group at the end of the poly(ethylene oxide) constituting the hydrophilic portion which is not bonded to the hydrophobic portion, and the whole amphiphilic compound having a molecular weight of 5,000 or less, wherein between the particle diameter of said pigment or said disperse dye and the molecular weight of said amphiphilic compound, there is the relationship represented by the following expression (1):0.004.ltoreq.(the particle diameter (nm) of the pigment or the disperse dye)/(the molecular weight of the amphiphilic compound).ltoreq.0.04. (1)