Patent ID: 7300902
Filing Date: 2007-11-27
Classification: C08F

Abstract:
1. A process for preparing a catalyst for ethylene polymerization, the catalyst comprising a magnesium halide derived from a magnesium compound represented by a formula (RM g X) p (MgX 2 ) q , in which R is an alkyl group having from 3 to 12 carbon atoms, X is halogen, and the molar ratio of q to p is between 0 and 1; wherein the solid catalyst for the ethylene polymerization is prepared by a process comprising: (1) reacting powdered magnesium with an alkyl halide of formula RX in an ether solvent to form a magnesium compound having a structure of formula (RMgX) (2) impregnating the magnesium compound onto silica carrier and drying to provide a magnesium compound-loaded silica support, wherein the silica is used in such an amount that per gram silica loads from 0.5 to 5.0 mmol of magnesium element; (3) reacting the magnesium compound-loaded silica support of step (2) with an alkyl halide of formula R (4) reacting the product obtained from step (3) with a titanium compound and an alkyl aluminum compound to form a main catalyst component, wherein the titanium compound has a structure represented by formula Ti(OR (5) contacting the main catalyst component with a cocatalyst component to form the catalyst for ethylene polymerization, wherein the cocatalyst component is an organo-aluminum compound, and the molar ratio of the Ti in the main catalyst component to the Al in the cocatalyst component is in the range from 1:30 to 1:300.