Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1995-11-14
1998-05-05
Bell, Mark L.
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106449, C04B 1430, C09C 136
Patent
active
057468192
ABSTRACT:
The present invention discloses high solids slurries of sulfate process, anatase titanium dioxide pigment. The improvements of these slurries over those of the prior art are improved slurry stability, tolerance to calcium and magnesium ions, foaming tendencies and reduced tendency to flocculate. The slurries of the present invention are comprised of at least 65% by weight of anatase TiO.sub.2 pigment produced by the sulfate production process dispersed in water containing a sufficient quantity of a dispersing agent selected from the group consisting of acrylic acid homopolymers and 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 above acids, which have been partially or completely neutralized with a neutralizing agent having a monovalent group and at least one neutralizing agent having a polyvalent group. A process for producing the slurries of the present invention is disclosed and comprises the steps of a) introducing the dispersing agent into water, b) adjusting the pH to a value greater than 7, c) adding the TiO.sub.2, with adequate mixing to break up large agglomerates, and, optionally, d)grinding in the presence of a suitable grinding medium to achieve the desired mean particle size for pigmentary applications.
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Kostelnik Robert J.
Wen Fu-Chu
Bell Mark L.
SCM Chemicals, Inc.
Troilo Louis M.
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