PIPE SYSTEMS MADE FROM RANDOM COPOLYMERS OF PROPYLENE AND a-OLEFINS

摘要

0.2 to 5% by weight of propylene and 1-hexene and optionally ethylene and C ₄ -C ₁₀ 0 to 9 mole % excess of olefin is selected from - amount of semi-crystalline random polymer of the repeating unit having a pipe system comprising one or more layers . The polymer according to the ratio of the weight average molecular weight to the number average molecular weight () , has a broad molecular weight distribution in the range of 5 to 11 , the molecular weight distribution of the unimodal said Genie , intrinsic viscosity than the hexene-1 content of 3.3 dL / g is less than fraction , the inherent viscosity of the hexene is 3.3 dL / g or more fractions the low content of -1 .