Patent ID: 8277949

Claim:
A prefabricated flexible membrane having high stability to ultraviolet (UV) exposure, said prefabricated flexible membrane comprising a fabric or mat material that includes a coating composition, said coating composition coated on at least one outer surface of said fabric or mat material, at least partially impregnated in said fabric or mat material, or combinations thereof, said coating composition comprising a petroleum liquid, polymer, and thermoplastic polyurethane, said petroleum liquid including one or more materials selected from the group consisting of asphalt, modified asphalt, bitumen, modified bitumen, coal-tar and modified coal tar, said polymer including one or more compounds selected from the group constituting of block polymer and plastomer, said polymer includes one or more compounds selected from the group consisting of Amorphous Poly-Alpha-Olefin (APAO), Atactic Polypropylene (APP), Ethylene-Vinyl Acetate (EVA), Polyphthalamide (PPA), Polymeric Polyisocyanate (PPI), Styrene-Ethylene/Butylene-Styrene (SEBS), Styrene-Butadiene-Styrene (SBS) and Styrene-Isoprene-Styrene(SIS), said thermoplastic polyurethane includes one or more compounds selected from the group consisting of polyether backbone Thermoplastic Polyurethane (TPU), polyester backbone TPU, polyether/polyester backbone TPU and polycarbonate backbone TPU.