Polyolefin-Zusammensetzung

A polyolefin composition suitable for injection moulding is disclosed comprising an ultrahigh-molecular-weight polyolefin having an intrinsic viscosity of 10-40 dl/g as measured in decalin at 135 DEG C and a low-molecular-weight to high-molecular-weight polyolefin having an intrinsic viscosity of 0.1-5 dl/g as measured in decalin at 135 DEG C, wherein the ultrahigh-molecular-weight polyolefin is contained in the composition in an amount of 10-40% by weight based on the total weight of the composition, the composition has an intrinsic viscosity [ eta ]c of 3.5-15 dl/g as measured in decalin at 135 DEG C and a melt torque T of 4.5 kg.cm or less, and a section of an injection-moulded square plate produced from the composition has a phase-separated structure composed of a continuous phase and a discontinuous phase wherein the average particle diameter (average major axis length) of the discontinuous phase is 20 mu m or less. Injection-moulded articles formed from this composition have excellent sliding properties and excellent impact resistance and are free from delamination. A process for producing the composition is also disclosed.