CATALYST FOR THE MANUFACTURE OF POLYETHYLENE WITH A NARROW MOLECULAR WEIGHT DISTRIBUTION

摘要

An ethylene-alpha-olefin copolymerization catalyst is prepared by impregnati ng a porous support, such as silica, with a contact mixture of an organomagnesium compound such as dialkyl magnesium and a silane compou nd which is free of hydroxyl groups, such as tetraethyl orthosilicate. A transition metal component such as titanium tetrachloride i s then incorporated into the support in a specific ratio to the magnesium and silane components. Activation of this catalyst precursor with a trialkylaluminum compound results in a catalyst system which is effective for the production of ethylene copolymers.