Photocatalytic roofing granules include a binder and inert mineral particles, with photocatalytic particles dispersed in the binder.

The present invention relates to a grinding aid as well as a grinding method. Further, the present invention pertains to a titanium dioxide particle with a layer comprising a grinding aid as described herein and the use of said titanium dioxide particle in various applications.

Photocatalytic roofing granules include a binder and inert mineral particles, with photocatalytic particles dispersed in the binder.

Photocatalytic roofing granules include a binder and inert mineral particles, with photocatalytic particles dispersed in the binder.

The invention relates to a matting agent comprising agglomerates of pigment particles, to a method for the preparation of such matting agents, and to coating formulations containing the matting agents disclosed herein. The present invention further relates to pigmented mat surfaces, and to the use of agglomerates of pigment particles for matting pigmented coatings.

A micro-agglomerate of fines of a material that is predominantly titanium dioxide in which the fines are bound in the micro-agglomerate by a polysaccharide gum or cellulose derivative and in which the micro-agglomerate has been heated in the temperature range 250-600 C. so that the polysaccharide gum or cellulose derivative is an effective primary binder of the fines when the micro-agglomerate is subjected to high temperature gas flow conditions equivalent to those in the Chloride Process. Also disclosed is a method of agglomerating fines of a material that is predominantly titanium dioxide.

Titanium Dioxide and other pigments or powders processed by this present process are smoothly discharging, low dusting, agglomerated, compaction resistant, extremely friable, and fully dispersible, and the process for the production of smoothly discharging pigment or powder consists of gently blending in the presence of an air flow and an electrostatic charge where said pigment or powder is agglomerated with or without a treated or non-treated seed particle of the same or similar pigment whereas said pigment or powder in accordance with the invention yields a composition of substantially spherical particulate that has a pseudo-particle size of 0.1-5.0 mm in the form of smoothly discharging, low dusting, non-sticky, agglomerated, compaction resistant pigment or powder, in which said pigment or powder particles are 80% -99.9% by weight, pigment, and in which the pigments or powders are compatible with inks, paints and plastics, and can be readily dispersed and incorporated into the same.

TiO.sub.2 based scrubbing granules, and methods of making and using such TiO.sub.2 based scrubbing granules are described. TiO.sub.2-based scrubbing granules include granulated TiO.sub.2 and about 0.5% to about 20% dry weight inorganic salt binder. Other TiO.sub.2 based scrubbing granules include unsintered granulated TiO.sub.2 and about 0.5% to about 20% dry weight inorganic salt binder. Inorganic salt binder include sodium aluminate. Methods of making TiO.sub.2 based scrubbing granules include i) combining TiO.sub.2 particles with inorganic salt binder to form TiO.sub.2-binder mixture comprising from about 0.5% to about 20% dry weight binder; ii) granulating the TiO.sub.2-binder mixture; and drying the granulated TiO.sub.2-binder mixture to form TiO.sub.2-based scrubbing granules. Methods of using such TiO.sub.2-based scrubbing granules include introducing TiO.sub.2-based scrubbing granules to remove adherent deposits on an inner surface of a reactor or heat exchanger during processes of forming TiO.sub.2 particles and finishing the formed TiO.sub.2 particles into finished pigment products.

TiO.sub.2 based scrubbing granules, and methods of making and using such TiO.sub.2 based scrubbing granules are described. TiO2-based scrubbing granules include granulated TiO.sub.2 and about 0.5% to about 20% dry weight inorganic salt binder. Other TiO.sub.2 based scrubbing granules include unsintered granulated TiO2 and about 0.5% to about 20% dry weight inorganic salt binder. Inorganic salt binder include sodium aluminate. Methods of making TiO.sub.2 based scrubbing granules include i) combining TiO.sub.2 particles with inorganic salt binder to form TiO.sub.2-binder mixture comprising from about 0.5% to about 20% dry weight binder; ii) granulating the TiO2-binder mixture; and drying the granulated TiO.sub.2-binder mixture to form TiO2-based scrubbing granules. Methods of using such TiO.sub.2-based scrubbing granules include introducing TiO.sub.2-based scrubbing granules to remove adherent deposits on an inner surface of a reactor or heat exchanger during processes of forming TiO.sub.2 particles and finishing the formed TiO.sub.2 particles into finished pigment products.

The invention relates to a matting agent comprising agglomerates of pigment particles, to a method for the preparation of such matting agents, and to coating formulations containing the matting agents disclosed herein. The present invention further relates to pigmented mat surfaces, and to the use of agglomerates of pigment particles for matting pigmented coatings.