Predispersed slurry of titanium dioxide
AssigneeNL CHEM Canada Inc.
InventorYves Gladu
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Abstract
A process is disclosed for preparing a slurry of titanium dioxide having a solids content of at least 60%. In the past titanium dioxide pigment slurries have been prepared by mixing titanium dioxide powder, water and additives in a batch mixer, however, this is a lengthy process and generally results in some agglomeration of the particles. The present process comprises the steps of mixing titanium dioxide pigment, at least one dispersant additive and water to a first mixture having a solids content of at least about 60%, pumping the first mixture through a disperser mill to produce a second mixture free from agglomerates.
Claims12
A process for preparing a dispersed slurry of dispersant coated rutile titanium dioxide which comprises:
- a. preparing a dispersant coated titanium dioxide slurry having a solids content of at least about 60% by weight by mixing rutile titanium dioxide;
- at least one dispersant additive, and water;
- b. passing the dispersant coated titanium dioxide slurry directly through a high shear mill having an impeller peripheral speed sufficient to de-agglomerate the titanium dioxide but prevent stripping the coating from the titanium dioxide;
- and
- c. recovering a substantially agglomerate-free rutile titanium dioxide slurry having a solids content of at least 60% by weight.
Dependencies are inferred from the claim text.