Treated inorganic solids
AssigneeTioxide Group Services Limited
InventorsColin Lloyd Watson, Peter James Allen
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Abstract
A treated inorganic solid comprises particulate inorganic material the particles of which are coated with an alkylphosphonic acid or ester thereof, the alkylphosphonic acid containing 6 to 22 carbon atoms. The particulate material is usually a pigment, extender or filler which is treated by mixing with the alkylphosphonic acid or ester for example in an aqueous dispersion or during a process step such as milling. The treated inorganic solid is particularly useful for preparing polymer compositions such as masterbatches.
Claims19
A treated inorganic solid comprising particulate titanium dioxide or zinc oxide, the particles of which are coated with a composition consisting essentially of an organophosphorus compound selected from the group consisting of alkylphosphonic acids and esters of alkylphosphonic acids wherein the alkylphosphonic acid contains from 8 to 22 carbon atoms.
A method of treating particulate titanium dioxide or zinc oxide comprising forming an aqueous dispersion or slurry of said particulate titanium dioxide or zinc oxide, mixing said aqueous dispersion or slurry with an organophosphorus compound selected from the group consisting of alkylphosphonic acids and esters of alkylphosphonic acids wherein the alkylphosphonic acid contains from 8 to 22 carbon atoms and adding a polymer to the treated titanium dioxide or zinc oxide- containing aqueous dispersion or slurry.
A method of treating an inorganic particulate material comprising mixing particulate titanium dioxide or zinc oxide with an organophosphorus compound selected from the group consisting of alkylphosphonic acids and esters of alkylphosphonic acids whilst the titanium dioxide or zinc oxide is being subjected to a treatment process selected from filtration, spray drying and milling wherein said alkylphosphonic acid contains from 6 to 22 carbon atoms.
Dependencies are inferred from the claim text.