Ethylene polymerization

Claim 1

A PROCESS FOR POLYMERIZING ETHYLENE WHICH COMPRISES CONTACTING AN ETHYLENE CONTAINING STREAM UNDER POLYMERIZATION CONDITIONS WITH A CATALYST WHICH FORMS ON MIXING (1) AN OXIDE COMPONENT SELECTED FROM THE GROUP CONSISTING OF SILICA; MIXTURES OF SILICA AND ALUMINA CONTAINING UP TO 25 WEIGHT PERCENT ALUMIN; AND MIXTURES OF CHROMIUM OXIDE AND AT LEAST ONE MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICA, ALUMINA, ZIRCONIA, AND THORIA, AT LEAST PART OF THE CHROMIUM BEING IN THE HEXAVALENT STATE AT THE INITIAL CONTACTING OF MONOMER THEREWITH, (2) AN ORGANOMETAL COMPONENT OF THE FORMULA RXM WHEREIN R IS SELECTED FROM THE GROUP CONSISTING OF HYDROGEN AND ALKYL, ARYL, CYCLOALKYL, ALKOXY RADICALS AND COMBINATIONS OF THESE RADICALS CONTAINING UP TO 12 CARBON ATOMS, AT LEAST ONE R GROUP BEING A HYDROCARBON RADICAL; M IS SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, BALLIUM, INDIUM, THALLIUM, ZINC, BORON, LEAD, LITHIUM, ZIRCONIUM, COBALT, MAGNESIUM AND TIN; AND X IS AN INTEGER EQUAL TO THE VALENCE OF M, AND (3) A VANADIUM COMPONENT SELECTED FROM THE GROUP CONSISTING OF VANADIUM CHELATES AND VANADYL CHELATES OF BETA-DIKETONES OF THE FORMULA R''-CO-CH2-CO-R'' WHERE EACH R'' IS INDIVIDUALLY SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, AND CYCLOALKYL RADICALS AND COMBINATIONS OF SAID RADICALS, EACH R'' CONTAINING UP TO 12 CARBON TOMS.