Patent ID: 6117921
Filing Date: 2000-09-12
Classification: C08F,C09D

Abstract:
A process for making printed images, said process comprising the step of jetting an ink jet ink composition from an ink jet printer, said ink jet ink composition comprising:(a) an aqueous carrier medium,(b) an insoluble colorant, and(c) a salt of a graft copolymer dispersant that is soluble in the aqueous carrier medium, said dispersant having a backbone portion and at least one sidechain portion wherein:(i) both portions are prepared from ethylenically unsaturated monomers and the sidearm portion is hydrophilic and the backbone portion is hydrophobic;(ii) the ratio of the hydrophobic portion to the hydrophilic portion is in the range of 90:10 to 10:90 by weight; and(iii) the hydrophobic portion contains at least 50% by weight, based on the total weight of the hydrophobic portion, of at least one monomer selected from the group consisting of aryl esters of acrylic acid, aryl esters of methacrylic acid, N-aryl acrylamide, N-aryl methacrylamide and vinyl aryl esters.