Surface modified pigment compositions
AssigneeCiba-Geigy Corporation
InventorEdward E. Jaffe
Life of this patent
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Abstract
Surface modification of a variety of pigments, particularly quinacridone pigments, and the pigments resulting therefrom whereby the pigment is treated with a solvent-free, basic, nitrogen-containing copolymer of the polyurethane series and with a dispersion-improving derivative of the primary pigment resulting in compositions exhibiting enhanced performance in automative and other finish systems.
Claims13
A pigment composition comprising an organic pigment, from about 1 to 10%, by weight of a derivative of said pigment which acts on the surface of the organic pigment to improve the dispersion thereof and from about 3 to 20%, by weight of said pigment, of a substantially solvent-free, basic, nitrogen-containing copolymer of the polyurethane series.
A processfor improving the rheological and stability characteristics of an organic pigment dispersion and the gloss and distinctness properties of a finish prepared therefrom which comprises applying to the surface of said organic pigment from about 3 to 20% of a substantially solvent-free, basic, nitrogen-containing copolymer of the polyurethane series and from about 1 to 10% of a derivative of said pigment which acts on the surface of the organic pigment to improve the dispersion thereof, said percentages being based on the weight of pigment.
Dependencies are inferred from the claim text.