Patent No. U.S. 7,122,081 B2
Ciba Specialty Chemicals Corporation has received a patent for a process for particle size reduction of organic pigments to improve the optical properties of pigments. The process is comprised of milling a mixture comprised of approximately 10% to 60% weight of one or more crude organic pigments, from 0.1% to 25% weight of water soluble styrene copolymer dispersant based on the dry weight of the crude organic pigment, optionally from 0.1% to 1.0% weight of a defoamer, optionally from 0.1% to 5.0% weight of an additive based on the dry weight of the crude organic pigment, and greater than 10% weight water wherein the first, third and fourth weights are based on the total weight of the mixture, and isolating the organic pigment.
Milling process for quinacridone pig
Published April 18, 2007
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