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AssigneeManfred R. Kuehnle
InventorsEgon Matijevic, Wan P. Hsu, Manfred R. Kuehnle
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A method of making synthetic color pigments comprises synthesizing monodispersed colloidal core particles by precipitation from a solution and applying dye material to the core particles either by adsorption directly into the core particles or by adsorption or incorporation into alumina fixation shells at the surfaces of the core particles. Additional functional shells may be applied to the dyed core particles for various reasons. The pigments are useful for the coloration of various media such as printing inks and paint compositions.
A method of making color pigment adapted for use in a carrier material having a selected refractive index, the method comprising the steps of
The method defined in claim wherein the precipitating step comprises hydrolyzing TEOS in a solvent including alcohol, water and ammonia so as to precipitate core particles of silica.
A method of making a synthetic color pigment of a selected color comprising the steps of
A synthetic color pigment adapted for use in a carrier material having a selected refractive index, the pigment comprising myriad monodispersed colloidal core particles having substantially uniform size and shape and a refractive index that substantially matches that of the carrier material, and color shells on the core particles consisting of dye material from the same dye batch.
Dependencies are inferred from the claim text.