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US 2013/0074734 A1Published application
Method for Surface Modification of Titanium Dioxide Pigment
OwnerUwe Wilkenhoner, Jurgen Benderinventors
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OwnerUwe Wilkenhoner, Jurgen Benderinventors
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The invention relates to a method for the surface modification of titanium dioxide pigment and to its use, particularly in coatings, for interior and exterior walls (emulsion paints) and in water-borne paint systems. The method for surface modification is based on a titanium dioxide pigment that has been provided with a fluffily structured surface coating and where the fluffily structure of the surface coating is at least partially compacted, preferably by exposing the pigment particles to high shear and impact forces. The pigment particles are preferably coated with silicon oxide and/or aluminium oxide. The method according to the invention preferably reduces the specific surface area (BET) by roughly 30%. The pigment according to the invention can be used to optimise the rheological properties and the open time of the paint.
A method for the surface treatment of titanium dioxide pigment particles, comprising:
The method according to 1, wherein the particles in step a) have a specific surface area (BET) greater than roughly 60 m2/g and in step b) the specific surface area of the particles is reduced to less than roughly 40 m2/g by the exposure to shear and impact forces.
The method according to 8, wherein the particles in step a) have a specific surface area (BET) greater than roughly 60 m2/g and in step b) the specific surface area of the particles is reduced to less than roughly 40 m2/g by the exposure to shear and impact forces.
The method according to 9, wherein the particles in step a) have a specific surface area (BET) greater than roughly 60 m2/g and in step b) the specific surface area of the particles is reduced to less than roughly 40 m2/g by the exposure to shear and impact forces.
Dependencies are inferred from the claim text.