Patent ID: 8022117
Filing Date: 2011-09-20
Classification: C09B,C09D

Abstract:
1. A non-aqueous pigment dispersion comprising: a color pigment, a polymeric dispersant, and a dispersion synergist including an anion part and a cationic part; wherein the molecular weight of the anionic part of the dispersion synergist containing at least one carboxylate group is smaller than 98% of the molecular weight of the color pigment; and the anionic part of the dispersion synergist has a similarity coefficient SIM of at least 0.5 with the similarity coefficient defined by: wherein, S represents the number of atoms in the anionic part of the dispersion synergist; P represents the number of atoms in the color pigment; C represents a maximum number of atoms in common between the anionic part of the dispersion synergist and the color pigment which are bonded together as one chemical structure; and t is an integer representing the number of times that the maximum number of atoms in common C fit into a chemical structure of organic color pigment, withoutcounting atoms of the color pigment twice.