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US 5,203,918 AGranted
Method for forming aggregated kaolin pigment
AssigneeE.C.C. America Inc.
InventorC. Arlyn Rice
Life of this patent
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Abstract
A method for forming an aggregated kaolin clay pigment, comprising: preparing an aqueous 6-30% solids slurry of a fine particle size feed kaolin; intermixing with said slurry from about 10 to 20% of alum, by weight of the dry kaolin; adding to the mix of step (b) from about 15 to 30% of sodium silicate, by weight of the dry kaolin; mixing the reactants of step (c); and filtering and drying the slurry to recover aggregates of adherent platelets.
Claims7
A method for forming an aggregated kaolin clay pigment, consisting essentially of:
- (a) preparing an aqueous 6-30% solids slurry of a fine particle size feed kaolin;
- (b) intermixing with said slurry from about 10 to 20% of alum, by weight of the dry kaolin;
- (c) adding to the mix of step (b) from about 15 to 30% of sodium silicate, by weight of the dry kaolin;
- (d) mixing the reactants of step (c);
- and
- (e) filtering and drying the slurry to recover aggregates of adherent kaolin platelets;
- the steps (b), (c) and (d) being carried out at a pH in the range of from about 3.5 to 5.0.
4 more elements
Dependencies are inferred from the claim text.