| abstract |
Disclosed is a process for preparing conditioned titanium dioxide pigments comprising (a) during pigment finishing prior to isolation as finished pigment, admixing the following components to form a conditioned pigment: (1) a crude titanium dioxide pigment material; (2) at least about 0.1% by weight, relative to the inorganic pigment, of one or more acrylic copolymer dispersants having at least one hydrophobic pigment adsorbing segment and at least one relatively hydrophilic stabilising segment, wherein the pigment adsorbing segment includes at least one polymerised monomer having acid, acid salt, phosphate or amine functionality; and (3) an optional processing liquid in which the inorganic pigment is substantially insoluble; and (b) isolating the conditioned inorganic pigment as dry powder. Further disclosed are pigment compositions, and aqueous pigment dispersions comprising a conditioned inorganic pigment prepared by the above process. |