Patent ID: 6962622

Claim:
A titanium dioxide pigment blend composition comprising; a Pigment Type A having a first titanium dioxide base material, the Pigment Type A having high greying resistance, wherein the high greying resistance is defined by a grade on the blue wool scale (ISO 4586-2) of greater than 6; and a Pigment Type B with an increased Si and Al content applied by precipitation of Si and Al compounds in flocculent form on to a second titanium dioxide base material, wherein the weight of the increased Si content of the Pigment Type B (calculated as SiO 2 ) is at least 3% of the weight of the titanium in the second titanium dioxide base pigment material and the total of the Si and Al weights (calculated as SiO 2 and Al 2 O 3 ) is at least 7% of the weight of the titanium in the second titanium dioxide base pigment material.