METHOD OF PREPARING INORGANIC PIGMENT DISPERSIONS

摘要

A method of preparing an inorganic pigment dispersion useful in the preparation of latex paints is provided. The method comprises dispersing an inorganic pigment in an aqueous medium further comprised of a dispersing polymer, said aqueous medium being essentially free of volatile organic solvents. The dispersing polymer is derived from monomers consisting essentially of an ethylenically unsaturated aromatic monomer having an unsubstituted ethylenic group, an ethylenically unsaturated aromatic monomer having an alkyl-substituted ethylenic group, and an ethylenically unsaturated acid monomer. The amount of the ethylenically unsaturated acid monomer is sufficient to permit the dispersing polymer to associate with an inorganic pigment in an aqueous medium in a manner which disperses the inorganic pigment in the aqueous medium to form a stable aqueous dispersion of said inorganic pigment. The total amount of the ethylenically unsaturated aromatic monomers is sufficient to reduce the water sensitivity of a dried coating of a latex paint comprised of said stable aqueous dispersion of said inorganic pigment. Use of the inorganic pigment dispersions to prepare latex paints, and latex paints resulting from such use, are also provided.