Pigmented phase change inks containing low molecular weight quaternary ammonium salt dispersants

摘要

A pigmented phase change ink composition comprising an ink vehicle, a dispersant, and pigment particles wherein the dispersant is a chemical compound of formula:
wherein R 1 is an alkyl group, ary1 group, alkylaryl group or arylalkyl group with at least 23 carbon atoms, R 2 is an alkylene group, arylene group, alkyarylene group or arylalkylene group with at least 2 carbons and X is a quaternary ammonium salt. The ink can be resistant to substantial aggregation and settling of the pigment particles in the melt and even when exposed to freeze thaw cycles.