Copper phthalocyanine blue pigment composition and water borne dispersion thereof
AssigneeSun Chemical Corporation
InventorsStanislav Vilner, Tatiana N. Romanova, Mark Ortalano, George H. Robertson, Russell J. Schwartz
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Abstract
Phthalocyanine blue pigments and pigment dispersions for water-borne inks and coatings are described. The pigments are produced by dry milling phthalocyanine blue and a polymeric dispersant, optionally with inorganic fillers and other additives, to obtain a material with improved coloristic, rheological, and stability properties. The resulting activated crude is then processed directly into water-based pigment dispersion with additives and/or surfactants to facilitate conversion to pigmentary form while maintaining the desirable green and clean shade.
Claims30
A composition comprising milled phthalocyanine blue and a dispersant, wherein the dispersant comprises a poly(oxyalkylene) modified dialkylsuccinyl succinate or poly(oxyalkylene) modified phthalocyanine, or a combination thereof.
A process which comprises:
- a) dry milling a phthalocyanine blue crude to form an activated crude,
- b) mixing the activated crude with water and surfactant at elevated temperature to form a premix,
- c) milling the premix to form a stable dispersion, and
- d) mixing the stable dispersion with at least one member selected from the group consisting of surfactant, resins, additives, additional water, humectant, and extender, wherein at least one of a) through d) is effected in the presence of a dispersant which is a poly(oxyalkylene) modified dialkylsuccinyl succinate or poly(oxyalkylene) modified phthalocyanine, or a combination thereof.
Dependencies are inferred from the claim text.