Patent ID: 6855193
Filing Date: 2005-02-15
Classification: C09D

Abstract:
1. An ink jet ink composition comprising water, humectant and a nanoparticulate dispersion that is the product of self-assembling colorant molecules that spontaneously form the nanoparticulate dispersion without any prior physical attrition or prior surface modification, said self-assembling colorant molecules each represented by the formula: wherein: Q represents a chromophore; each A independently represents an organic or inorganic non-ionic, hydrophilic group capable of hydrogen bonding or other non-covalent bonding to form the nanoparticulate dispersion; each Z independently represents an organic or inorganic water-solubilizing group capable of electrostatic bonding to form the nanoparticulate dispersion; and m and n each independently represents an integer from 0 to 10; with the proviso that n+m is at least 1; and with the further proviso that at least about 50 wt. % of the colorant is present in the composition as particles.