TITANIUM DIOXIDE

摘要

A coloured composition comprising: a) NIR scattering TiO2 particulate material with an average crystal size of greater than 0.40 μm and a particle size distribution such that 30% or more of the particles are less than 1 μm; b) one or more non-white colorant; wherein the particulate material and the non-white colorant are dispersed within a vehicle. This material with a large crystal size has unusually high reflection of NIR radiation and, simultaneously, noticeably diminished reflectance of visible light. Also disclosed is a coated particulate TiO2 material, wherein the material has an average crystal size of greater than 0.40 μm, and the coating comprises one or more oxide material; this provides low levels of photocatalytic activity that were previously unattainable. This coated TiO2 material may be provided in a composition.

主权项

1. A coloured composition comprising:
NIR scattering particulate material, the material selected from the group consisting of titanium dioxide, doped titanium dioxide and combinations thereof, the material having an average crystal size of from 0.40 μm to 2.0 μm and a particle size distribution such that 30% or more of the particles are less than 1 μm, and wherein the NIR scattering material is coated with two or more oxide materials, wherein one of the oxide materials is a dense silica material and wherein one of the oxide materials is an oxide of one or more elements which are:
(a) group 4 (IVB) and 12 (IIB) transition metals selected from the group consisting of Ti, Zr and Zn and/or(b) group 13 to 15 (IIIA-VA) p-block elements selected from the group consisting of Al, P and Sn and/or(c) lanthanides; (ii) one or more non-white colorant; wherein the particulate material and the non-white colorant are dispersed within a vehicle.