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US 2004/0016369 A1Published application
Viscosity stable smectite clay slurries
AssigneeElementis Specialties, Inc.
InventorsWouter Ijdo, Wilbur S. Mardis, Fred Whitton
Life of this patent
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Abstract
A clay slurry is described using smectite clay, water, and a defined phosphonate additive that is hydrolytically stable over time. The viscosity of the clay slurry remains pourable and relatively unchanged over time compared to prior art slurries. The slurry is useful to provide rheological control to paints and coatings and is particularly useful as an anti-bleed additive for concrete.
Claims20
A smectite clay slurry, comprising:
- (a) at least 2 wt. % of one or more smectite clays, active clay basis;
- (b) from about 0.5 to 15 wt. % based on the weight of the smectite clay active clay basis of one or more phosphonate additives;
- and
- (c) water.
1 more element
A smectite clay slurry comprising:
- (a) about 2 to 25 wt. % hectorite clay, active clay base;
- (b) about 0.5 to 6 wt. % based on the weight of the hectorite clay active clay basis of one or more phosphonate additives;
- and
- (c) water.
1 more element
A method of making a smectite clay slurry, comprising:
- (a) treating a mixture of one or more smectite clay and water with one or more phosphonate additives to form a clay slurry;
- and
- (b) adjusting the pH of the clay slurry to above 5.5.
A method of making a smectite clay slurry, comprising:
- (a) treating a mixture of one or more smectite clays and water with one or more phosphonate additives to form a clay slurry;
- and
- (b) shearing the clay slurry.
Dependencies are inferred from the claim text.