POLYMER COMPOSITIONS

摘要

Novel polyethylenes are prepared having a density in the range 900-980 kg/m<3> and a molecular weight >200,000 characterised by a fracture toughness at -40 DEG C >20kJ/m<2> and a dynamic viscosity of <3000 Pa.s at 100 rad/sec. The novel polymers also having a die swell of 10-80 % and show a unique combination of physical and processing properties. The polymers may be prepared by use of catalysts comprising a metallocene component and a Ziegler component.