Patent ID: 7141125

Claim:
A liquid composition which in use is applied to a surface and dries to leave a residue, wherein the composition comprises in admixture: (1) a photocatalyic material selected from peroxo modified titania, peroxo modified titanic acid, a mixture of peroxo modified titania, peroxo modified titanic acid, a mixture of titania with one or both of peroxo modified titania and peroxo modified titanic acid, a mixture of zinc oxide with one or both of peroxo modified titania or peroxo modified titanic acid, and a mixture of titania and zinc oxide with one or both of peroxo modified titania and peroxo modified titanic acid; (2) a sensitiser which acts to absorb visible or ultra violet or infra-red radiation and enhance the photocatalytic action of the said photocatalytic material, selected from: (a) cationic dyes, anionic dyes, nonionic dyes, amphoteric dyes, ruthenium compounds having three pairs of carboxylated bipyridyl groups complexed to a ruthenium (II) or ruthenium (III) atom, eosin, rose bengal, fluorescein, chlorophyll, metal-free porphyrin, sulphonated phthalocyanine, sulphonated zinc phthalocyanine, organosilicon (IV) phthalocyanines and naphthocyanines having Q-band absorption maxima at wavelengths greater than 660 nm, as well as salt forms and mixtures thereof; (b) one or more of the following compounds or salts thereof: ruthenium (III) bis-(4,4′-dicarboxyl-2,2′-bipyridine)-(1,2-bis[4-(4′-methyl-2,2′-bipyridyl)]ethane)-ruthenium(II) bis-(4,7-dimethyl-1,10-phenanthroline; ruthenium (III) bis-(4,4′-dicarboxyl-2,2′-bipyridine)-(1,2-bis[4-(4′-methyl-2,2′-bipyridyl)]ethane)-ruthenium(II) bis-(2,2′-bipyridine; ruthenium (II) bis-(4,4′-dicarboxyl-2,2′-bipyridine)-(4,4′-dimethyl-2,2′-bipyridine); ruthenium (II) bis-(2,2′-bipyridine)-(4,4′-dimethyl-2,2′-bipyridine); ruthenium (II) tris-(4,4′-dicarboxyl-2,2′-bipyridine); ruthenium (II) tris-(2,2′-bipyridine); ruthenium (II) bis-(4,4′-dicarboxyl-2,2′-bipyridine); ruthenium (II) bis-(2,2′-bipyridine); ruthenium(II) tris-(4,7-dimethyl-1,10-phenanthroline); ruthenium (II) bis-(4,7-dimethyl-1,10-phenanthroline); and, (4) a cationic, anionic, nonionic or amphoteric surfactant, or combination thereof.