Abstract: A pigmentary particulate material selected from the group consisting of titanium dioxide, doped titanium dioxide, and a mixture of titanium dioxide and doped titanium dioxide. The pigmentary particulate material has a mean crystal size of from 0.3 to 0.5 microns, a crystal size distribution such that ?40 wt.-% of the pigmentary particulate material has a crystal size of from 0.3 to 0.5 microns, and a ratio of a mean particle size to the mean crystal size of ?1.25.

Abstract: The present invention provides a coating composition suitable for use in forming a coating that can reduce a concentration of pollutant gases in the environment. The coating composition includes from 0.01 to 10 vol.-% of mesoporous titania particles, relative to a total volume of the coating composition, and from 5 to 99.99 vol.-% of a polymeric material, relative to the total volume of the coating composition. The mesoporous titania particles have a continuous exterior convex surface, a particle diameter of ?1 ?m but ? to 50 ?m, a BET specific surface area of from 30 to 350 m2/g, a modal pore diameter of ?5 nm but ?50 nm, and a pore size distribution so that 85% or more of a total pore volume is associated with pores having a diameter of 10 ?m or less.

Abstract: A pigmentary particulate material selected from the group consisting of titanium dioxide, doped titanium dioxide, and a mixture of titanium dioxide and doped titanium dioxide. The pigmentary particulate material has a mean crystal size of from 0.3 to 0.5 microns, a crystal size distribution such that ?40 wt.-% of the pigmentary particulate material has a crystal size of from 0.3 to 0.5 microns, and a ratio of a mean particle size to the mean crystal size of ?1.25.