Patent ID: 9296901
Filing Date: 2016-03-29
CPC Classification: B82Y,C01P,C08K,C09C,Y10T

Claim Text:
1. Composite particles which consists of: white inorganic particles selected from the group consisting of titanium dioxide, zinc oxide, titanium mica, muscovite, silica powder, white carbon, fine silicic acid powder, diatomaceous earth, clay, calcium carbonate, barium sulfate, alumina white, talc, and transparent titanium oxide, a surface modifier coating layer formed on a surface of the respective white inorganic particles, and a dye coat adhered onto the surface of the respective surface-modifier-coated white inorganic particles, which composite particles have an anti-bleeding property of not less than 94% as measured in a water-based or a solvent-based composition; and which dye has an anti-bleeding property of not more than 89.1% and 88.5% as measured in water and a solvent, respectively; wherein the anti-bleeding property of the composite particles is measured by the following procedure: 1 g of the sample particles to be measured and 50 mL of purified water are subjected to ultrasonic dispersion for 60 min, the obtained dispersion is subjected to centrifugal separation at a rotating speed of 10000 rpm for 15 min to separate a supernatant therefrom, and the light transmittance of the thus separated supernatant is measured in a wavelength range of 380 to 720 nm by a UV-visible recording spectrophotometer, the anti-bleeding property being expressed by the minimum light transmittance in the measured range, and wherein the anti-bleeding property of the dye is measured by the following procedure: 1 g of the sample dye to be measured and 50 mL of purified water or ethanol are subjected to ultrasonic dispersion for 60 min, the obtained dispersion is subjected to centrifugal separation at a rotating speed of 10000 rpm for 15 min to separate a supernatant therefrom, and the light transmittance of the thus separated supernatant is measured in a wavelength range of 380 to 720 nm by a UV-visible recording spectrophotometer, the anti-bleeding property being expressed by the minimum light transmittance in the measured range.