| abstract |
A non-blown roofing grade bitumen composition comprising bitumen feedstock, polyolefin having a molecular weight of from about 800 to about 50,000 g/mol, and optionally one or more additives, wherein the softening point of the composition is above 70° C as determined according to method ASTM D36 and the penetration of the composition is at least about 12 dmm at 25°C as determined according to method ASTM D5. A method of making the same. |