Patent ID: 6197104
Filing Date: 2001-03-06
Classification: C01G,C01P,C09C

Abstract:
A process of preparing a high solids slurry of anatase titanium dioxide pigment which comprises greater than 75% anatase TiO.sub.2 pigment, comprising:a) dry milling anatase TiO.sub.2 pigment to produce agglomerates of said anatase TiO.sub.2 pigment;b) de-agglomerating said agglomerates of the anatase TiO.sub.2 pigment; andc) mixing said de-agglomerated TiO.sub.2 pigment with water in the presence of a dispersant selected from the group consisting of i) acrylic acid homopolymers and ii) copolymers that are predominantly acrylic acid and contain at least one comonomer selected from the group consisting of maleic acid, methacrylic acid, itaconic acid, crotonic acid, fumaric acid, acrylamide, acrylonitrile, ethylene, propylene, styrene and esters of the acids, wherein the homopolymers or copolymers have been partially or completely neutralized with a neutralizing agent having a monovalent group and at least one neutralizing agent having a polyvalent group, thereby forming said slurry.