Patent ID: 7651780
Filing Date: 2010-01-26
Classification: B32B,C08L,E04D,Y10T

Abstract:
1. A thermoplastic polyolefin (TPO) roofing membrane comprising a reinforcement scrim sandwiched between cap and base layers which are pressed into a single ply membrane having a thickness of about 35-90 mils, characterized in that both of said layers are made of, by weight, 50-90% of metallocene-catalyzed polyethylene and about 10-50% of additives including a crystallinity enhancing polymer comprising high density polyethylene (HDPE), said membrane exhibiting a 90° heat seam peel strength of ≧60 lbs/linear inch (ASTM D-413) and a cold brittleness point of ≦50 °C. (ASTM D-413).