Bfs Diversified Products, LLC

Firestone Building Products Company, LLC

Lichih Peng

Carl E Watkins, Jr

A walkway pad is provided for placement on a flat roof to protect the roof from foot traffic, tools, and/or equipment. The walkway pad includes a body and at least one expansion joint that absorbs thermal movement of the body. A method of manufacturing the walkway pad is also provided.

Walkway pad with expansion joints

Broadly, the present invention provides a thermoplastic vulcanizate which can be readily processed into sheeting material for covering a roof that is both flexible and highly elastic. Where other thermoplastic elastomeric compositions have either been too stiff to act as roofing membranes or not processable due to their melt flow characteristics, the present thermoplastic vulcanizate employs a polypropylene random copolymer resin and a polyethylene random copolymer resin having about 10 to about 35 percent by weight &#x3b1;-olefin co-monomer units; together with a compatibilizing rubber and a peroxide-based cross-linking agent, to provide an effective membrane for covering roofs.

Thermoplastic vulcanizate and membrane for covering a roof made therefrom

A roofing membrane includes a substrate sheet formed of a thermoplastic vulcanizate (TPV) and a film layer of thermoplastic polyolefin (TPO) adhered to at least one surface of the substrate sheet. The TPV preferably includes a copolymer of ethylene and a carbonyl containing monomer dynamically vulcanized in a polyolefin thermoplastic, preferably metallocene-catalyzed polyethylene. A scrim reinforcement layer is optionally embedded in the TPV layer. When installed on a roof substrate, the membrane can be sealed by heat welding the seams of the membrane sheets.

Growing community of inventors

Fishers, IN, United States of America

Lichih Peng