Patent ID: 9643400
Date: 2017-05-09
CPC Classifications: B41J,B41M,C09D,Y10T

Claim:
1. A printing process comprising jetting an aqueous inkjet ink containing a negatively charged polymeric resin and a colorant onto a hydrophobic release layer of an intermediate transfer member, further comprising, prior to said jetting, contacting the hydrophobic release layer with an aqueous solution or dispersion of a polymeric chemical agent having a positive charge density of at least 3 meq/g of polymeric chemical agent and an average molecular weight of at least 1,000, provided that if the positive charge density of the polymeric chemical agent is less than 6 meq/g of polymeric chemical agent then the average molecular weight of the polymeric chemical agent is at least 5,000, wherein the polymeric chemical a ent is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer, a vinyl caprolactam-dimethylaminopropyl methacrylamide hydroxyethyl methacrylate terpolymer, a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate, a guar hydroxypropyltrimonium chloride, a hydroxypropyl guar hydroxypropyltrimonium chloride, and combinations thereof, and further comprising, after said jetting, transferring the ink to a substrate.