Patent ID: 6905814

Claim:
A process for cleaning or disinfecting surfaces exposed to light, comprising the step of depositing a film of titanium dioxide on said surfaces with a film-forming dispersion comprising a continuous phase, said titanium dioxide being in the form of elementary particles whose size is less than 100 nm, and whose specific surface area is greater than 150 m 2 /g, the continuous phase of said dispersion comprising water or at least one alcohol whose boiling point is less than 120° C., and said dispersion having, when it comprises water, a pH different by at least 1 unit, from the value of the isoelectric point of titanium dioxide in said dispersion, said dispersion further comprising at least one film-forming organic or organosiloxane polymer interacting with the surface of the titanium dioxide particles by electrostatic bonding and selected from the group consisting of: a sulfonated terephthalic oligoester or copolyester, a polyoxyalkylenated polymer which carries anionic functions, a cationic polymer additionally exhibiting bacteriostatic properties, a cationic homopolymer or copolymer derived from at least one cationic monomer comprising an ethylenic unsaturation, optionally in a mixture with at least one nonionic monomer, and an amphoteric copolymer derived from at least one cationic monomer comprising an ethylenic unsaturation, and at least one anionic monomer comprising an ethylenic unsaturation, optionally in a mixture with at least one nonionic monomer.