Patent ID: 7592048

Claim:
A process for producing a photocatalytic substrate, the process comprising the steps of: (a) providing a textile support having at least one surface, (b) providing a coating composition, the coating composition being prepared by the steps, in order: (i) providing a liquid medium, (ii) dispersing a dry, particulate anatase titanium dioxide comprising individual primary particles in the liquid medium, wherein dispersing the primary particles of anatase titanium dioxide in the liquid medium forms agglomerated anatase titanium dioxide having an average agglomerate size of between about 0.2 and 14 microns, and (iii) adding a binder to the liquid medium produced in step (ii) to produce a coating composition, wherein the binder comprises polyacrylic latex, wherein the polyacrylic latex comprises a polyacrylic latex polymer backbone comprising 20% or less, by number, Si—O bonds, the coating composition comprising about 0.2 to about 1 wt. %, based on the total weight thereof, of the anatase titanium dioxide and an amount of binder sufficient to provide a ratio, by weight, of anatase titanium dioxide to binder of about 1:0.1 to about 1:5, (c) applying the coating composition to at least a portion of the surface of the textile support, and (d) drying the surface of the textile support to which the coating composition was applied to produce a photocatalytic substrate.