OLEFINE POLYMER, OLEFINE POLYMERISATION PROCESS AND CATALYST

摘要

An olefine polymerisation catalyst comprises a titanium trichloride component of high surface area, an organometallic component, a Lewis Base component and optionally a polyene. The TiCl3 component which may have a high porosity i conveniently obtained by the reaction of TiCl4 and an organoaluminium compound, treating the reaction product with a complexing agent and then contacting this product with TiCl4. The organometallic component is preferably aluminium triethyl, the Lewis Base component hexamethyl-phosphoric triamide and the polyene is cycloheptatriene. This system has high polymerisation activity combined with good stereospecificity. Polypropylene can be obtained in high yield thereby giving low catalyst residues and the polymer has a high stiffness modulus.