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US 8,911,865 B2Granted
Generation kaolin based paint pigment extender
AssigneeBASF SE
InventorsAshok Khokhani, Kenneth W. Folmar
Life of this patent
Estimating the term…
Abstract
A fully calcined kaolin pigment extender is provided which has a product Mullite Index (M.I.) of 25.0 or higher. The calcined kaolin pigment extender can be advantageously used in paints to improve scrub and burnish resistance.
Claims20
A kaolin pigment extender having a median particle size of greater than 2 to 7 microns, and which comprises a fully calcined kaolin clay having a product mullite index of 25.0 to 62.0.
A method of forming an improved kaolin pigment extender comprising:
- forming an aqueous slurry of hydrous kaolin, spray drying said slurry to a dried kaolin product,
- calcining said dried kaolin product at a temperature and a time sufficient to convert the hydrous kaolin to a fully calcined kaolin clay having a product mullite index of 25.0 to 62.0, and
- pulverizing said fully calcined kaolin clay to particles having a median particle size of greater than 2 to 7 microns.
Dependencies are inferred from the claim text.