Patent ID: 7897252

Claim:
A thermoplastic sheet selected from the group consisting of: thermoplastic polyolefin (TPO) and polyvinyl chloride (PVC) modified with an imbedded photocatalyst on one wetted surface side a thermoplastic surface comprising TiO.sub.n1, wherein 0<n1<2, and the imbedded photocatalyst comprising wetted particles having sizes of 0.1 to 0.25 mm, the wetted particles having a uniform coating that has been loaded in a range between approximately 1.5 mg/cm 2 to approximately 2.5 mg/cm 2 on the wetted one side of the thermoplastic surface to form a modified thermoplastic Sheet, the modified thermoplastic sheet having a modified surface that is resistant to the growth of nuisance organisms including damaging algae, fungus, bacteria, mold and mildew.