PARTICLE SURFACE TREATMENT

PARTICLE SURFACE TREATMENT

The invention provides a method of treating particulate titanium dioxide. The method comprises: i) providing particulate titanium dioxide, wherein the particulate titanium dioxide is coated with aluminium oxide, and/or includes within its crystal structure aluminium oxide in molar excess of the amou...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: JONES, ANTHONY G, WILLIAMSON, DAVID, COSTELLO, PETER, EDWARDS, JOHN L
Format: Patent
Sprache:eng
Schlagworte:
ADHESIVES
CHEMISTRY
COMPOSITIONS BASED THEREON
DYES
METALLURGY
MISCELLANEOUS APPLICATIONS OF MATERIALS
MISCELLANEOUS COMPOSITIONS
NATURAL RESINS
ORGANIC MACROMOLECULAR COMPOUNDS
PAINTS
POLISHES
PREPARATION OF CARBON BLACK
THEIR PREPARATION OR CHEMICAL WORKING-UP
TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES
USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:The invention provides a method of treating particulate titanium dioxide. The method comprises: i) providing particulate titanium dioxide, wherein the particulate titanium dioxide is coated with aluminium oxide, and/or includes within its crystal structure aluminium oxide in molar excess of the amount required to compensate any Nb2O5 in said crystal structure; and then ii) treating the particulate titanium dioxide with a coating agent that is an alkylphosphonic acid or ester thereof, wherein the alkylphosphonic acid has a C6-C22 alkyl group, and steam micronizing the particulate titanium dioxide, wherein the vapour exit temperature from the steam micronizer is 150?C or higher, so as to obtain a micronized particulate titanium dioxide that is provided with coating agent at its outer surface. The treated particulate titanium dioxide as obtained by the method can be incorporated into a polymer composition so as to increase its melt flow index, improve its dispersability, increase its hydrophobicity and/or increase its bulk density.