Co-milling organic pigments with fumed silica
AssigneeCiba Corporation
InventorsTapan K. Debroy, James Will
Life of this patent
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Abstract
A pigment composition comprising an intimate mixture of an organic pigment and fumed silica is prepared which exhibit improved coloristic characteristics including excellent chroma, color strength and enhanced color flop when incorporated into in polymeric systems, such as plastics or surface coatings, for example inks and paints. Also provided are coating compositions and plastic articles that are pigmented with a tinctorially effective amount of the inventive pigment composition. A particular embodiment of the invention relates to pigments useful in automotive coatings.
Claims21
A process for producing a pigment which process comprises milling a mixture comprising from about 1 to 50 parts by weight of fumed silica particles, which have a particle size of less than 1 micron, and from about 50 to 99 parts by weight of an organic pigment based on the total weight of the fumed silica/organic pigment mixture.
A pigment composition comprising an intimate mixture of from 1 to 50 parts by weight of fumed silica particles, which have a particle size of less than 1 micron, and from 50 to 99 parts by weight of an organic pigment based on the combined weight of the fumed silica and organic pigment.
Dependencies are inferred from the claim text.