Aqueous cationic polyurethane dispersions

Abstract

An aqueous polyurethane resin dispersion, the polyurethane resin having a cationic group and a polyalkylene oxide in a side chain thereof and is obtainable by reacting a polyisocyanate with a polyether diol and with a polymeric diol such as a polyester diol, polyether diol, polycarbonate diol, polyacrylate diol or polyolefin diol and with a cationic polyol selected from the group consisting of an quaternary ammonium, a quaternary phosphonium, a tertiary sulfonium and a iodonium wherein the cationic polyol comprises at least two hydroxyl groups and has a total number of carbon atoms making up the carbon chains between the cationic charged atom and a hetero atom or end of the carbon chain of the cation over charge ratio of at least 12. The aqueous dispersion can be used in treatment liquids for inkjet printing and in inkjet inks.

Dependencies are inferred from the claim text.