Sun Chemical Corporation

Ian Michael Whitehead

Paul Wallace

Yves Gentil

The present invention provides a composition comprising a synergistic combination of at least three dispersant classes, which is used to produce ultra-stable disperse dye dispersions and inks having azo-functional colorants.

Stable inkjet dispersions and inks

A method for preparing a dispersion of nanoparticles of a solid organic dye or pigment in a liquid carrier, and dispersions formed by such a method. The method includes continuously mixing: at least one solution or slurry containing a reactant precursor for the solid organic dye or pigment in an organic or other solvent with the liquid carrier in a counter current mixing reactor to obtain reaction of the reactant precursor and formation of the solid organic dye or pigment as a dispersion of nanoparticles in the liquid carrier and solvent mixture; optionally, removing unreacted reactant precursor and/or by-product from the dispersion when present; and optionally, concentrating the dispersion.

Growing community of inventors

Lens, Switzerland

Ian Michael Whitehead