Patent ID: 9145504
Filing Date: 2015-09-29
Classification: C08K,C09D,D21H

Abstract:
1. A method for preparing an aqueous pigment slurry with improved rheological properties, where the pigment is selected from calcium carbonate, kaolin, calcinated kaolin, talc, titanium dioxide, gypsum, chalk, satine white, barium sulfate, sodium aluminum silicate, aluminum hydroxide or any of their mixture, the method comprising adding a dispersion agent in amount of 0.1-3.5 parts per 100 parts of pigment to an aqueous phase of a slurry comprising pigment particles or to the aqueous phase into which the pigment particles are to be added, the dispersion agent comprising styrene acrylate copolymer which is obtained by polymerizing styrene and acrylate monomers in presence of starch and which has a mean particle size in the aqueous dispersion in the range of 20-150 nm.