PARTICLE SURFACE TREATMENT

PARTICLE SURFACE TREATMENT

A method of treating particulate titanium dioxide includes providing the particulate titanium dioxide which includes a crystal structure and then treating the particulate titanium dioxide with a coating agent that is an alkylphosphonic acid or an ester thereof, and steam micronizing the particulate...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: EDWARDS, John L, WILLIAMSON, David, JONES, Anthony G, COSTELLO, Peter
Format: Patent
Sprache:eng ; fre ; ger
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:A method of treating particulate titanium dioxide includes providing the particulate titanium dioxide which includes a crystal structure and then treating the particulate titanium dioxide with a coating agent that is an alkylphosphonic acid or an ester thereof, and steam micronizing the particulate titanium dioxide with a steam micronizer so that a vapor exit temperature from the steam micronizer is 150° C. or higher, so as to obtain a micronized particulate titanium dioxide which includes the coating agent at an outer surface. The particulate titanium dioxide includes an aluminum oxide coating and/or includes within the crystal structure aluminum oxide in a molar excess of an amount required to compensate any Nb2O5 in the crystal structure. The alkylphosphonic acid includes a C6-C22 alkyl group.