Oil-based ink for electrostatic type ink jet process

摘要

An oil-based ink for an ink jet process of an electrostatic type, comprising: a nonaqueous carrier liquid having an electric resistance of 109 OMEGAcm or more and a dielectric constant of 3.5 or less; and chargeable resin particles dispersed in the nonaqueous carrier liquid, wherein the resin particles dispersed are copolymer resin particles obtained by polymerization granulation of a solution containing: at least one monofunctional monomer (A) which is soluble in a nonaqueous solvent and becomes insoluble in the nonaqueous solvent by polymerization; at least one monofunctional monomer (B) having an amino group represented by formula (I) shown below and being copolymerizable with monomer (A); and at least one resin for dispersion stabilization (P) which is a polymer soluble in the nonaqueous solvent and comprising a component represented by formula (II) shown below, a part of the polymer main chain being crosslinked: