Bitumen backed carpet tile

摘要

A bitumen composition suitable for a carpet tile backing is provided having from 12 to 35 wt. % bitumen, from 50 to 85 wt. % of an inorganic filler such as calcium carbonate and from 0.5 to 20 wt. % of an acid functionalized polyolefin selected from acrylic acid, maleic acid and maleic anhydride grafted isotactic polypropylene. The cold flow characteristics of the composition can be improved by incorporating from 1 to 10 wt. % atactic polypropylene.