Treatment process for titanium dioxide pigments, novel titanium dioxide pigment and its use in paper manufacture
AssigneeRhone-Poulenc Chimie
InventorsAnny Guez, Remy Lorang
Life of this patent
Estimating the term…
Abstract
Process for the surface treatment of a titanium dioxide pigment, characterized in that it comprises the following steps: an aqueous suspension of titanium dioxide pigments is formed, in a first step, a layer of alumina phosphate is precipitated on the surface of the pigment, in a second step, a layer of alumina is precipitated over the first layer of alumina phosphate, the pigment is recovered from the suspension; and titanium dioxide pigment, characterized in that it comprises a titanium dioxide core coated successively with a layer of alumina phosphate, then with a layer of alumina and then with a layer of magnesium oxide.
Claims5
A titanium dioxide pigment comprising a titanium dioxide core coated successively with layers of alumina phosphate, alumina and magnesium oxide.
A paper or paper laminate including titanium dioxide pigments wherein said pigments comprise a titanium dioxide core coated successively with layers of alumina phosphate and alumina.
Dependencies are inferred from the claim text.