Ink comprising an aqueous medium, a water-insoluble colorant and a dispersant for dispersing the colorant in the aqueous medium, the dispersant being a water-soluble polymer obtained by polymerizing a monomer containing at least one monomer selected from acryloylmorpholine represented by the formula (1): ##STR1## and styrene sulfonate represented by the formula (2): ##STR2## [wherein M is an alkaline metal atom or an amino group] is provided. This ink is suitable for using for an ink-jet recording system because it provides a fast recorded image and is also superior in storage stability and jetting stability.
An aqueous inkjet printing ink with excellent water resistance, wherein scorching onto a printer head scarcely occurs, the amount of a hydrophobic dye contained in an aqueous dispersion of a vinyl polymer can be increased, and sharp printed letters having deep color can be provided. The aqueous ink product for inkjet printing comprises a dispersion of a vinyl polymer obtained by copolymerizing one or more selected from a silicone macromer, an acrylamide monomer and a methacrylamide monomer (not having a salt-forming group), or a styrene macromer of a styrene homopolymer or a styrene copolymer having a polymerizable functional group at one terminal end, a polymerizable unsaturated monomer having the salt-forming group, and a monomer capable of polymerizing with these monomers in the presence of a radical polymerization initiator, a hydrophobic dye being contained in the dispersion.
A cationic, water-soluble polymer is disclosed as a substrate treatment resin (i.e., coating) to improve color-fastness and adhesion of an ink-jet ink printed onto the substrate. More particularly, a 50% solids aqueous solution of a cationic acrylic resin is provided as the printed substrate treatment resin. Also disclosed is a method for preparing the invention resin.
