Process for the production of ultra high molecular weight polyethylene

Abstract

The invention relates to a process for the production of ultra high molecular weight polyethylene in the presence of a catalyst system that comprises (I) the solid reaction product obtained from the reaction of a) a hydrocarbon solution containing 1) an organic oxygen containing magnesium compound or a halogen containing magnesium compound and 2) an organic oxygen containing titanium compound and b) an aluminium compound of the formula AlRaX(3-a) where R is a hydrocarbylgroup containing (3-10) carbon atoms, X is an halogenide and 0<a<3 and (I!) an aluminium compound having the formula AlR3 in which R is a wherein the molar ratio of aluminium from (b): titanium from (a) is higher than 3:1 and the average particle size of the catalyst ranges between 0.1 μm and 1.0 μm and The obtained polymer is in the form of spheroidal particles with an average particle size of less than 50 μm or is in the form of loosely bound agglomerates consisting of spheroidal sub-particles with an average particle size of less than 50 μm.

Dependencies are inferred from the claim text.