ES465664A1 - Process for the production of powdered polyethylenes - Google Patents

Abstract

Procedure for obtaining polyolefins in powder form with high pouring weight, good flowability, average grain diameters up to 1000 microns and practically no portion of the finest grain by polymerization of ethylene, possibly in mixture with other l-olefins, thus as in the presence of hydrogen in inert liquid hydrocarbons, at temperatures between 50ºC and around 95ºC and pressures from 10 to 100 bar, preferably from 20 to 60 bar, according to continuous or discontinuous procedures by means of Ziegler catalysts, prepared in inert liquid hydrocarbons by reaction of vanadyl compounds (V) containing chlorine or alkoxy with aluminum-organic compounds, separation of the insoluble reaction product and activation with any desired aluminum-organic compound, characterized in that: (1) a product is incorporated as vanadyl compound (V) of reaction of vanadyl chloride (V) and a vanadyl alcoholate (V) in molar ratios of 1: 2 to 2: 1 or directly the reaction product of vanadyl chloride (V) with an alcohol, preferably ethanol, propanol- (1), butanol- (1) in molar ratios from 1: 2 to 1: 1 and 2) as aluminum compounds -organic, for reduction, ethylaluminum dichloride and/or diethylaluminum chloride or isobutylaluminum dichloride and/or diisobutylaluminum chloride in aluminum molar ratios are applied to vanadine compound from 1: 1 to 3: 1, where (3) the reaction of the vanadine compounds with the vanadine compounds with the aluminum-organic compounds is carried out with stirring, with specific stirring yields from 0.1 to 20000 watts/m3 preferably from 1 to 5000-watts/m3 and (4) Activation is carried out with aluminum alkyl compounds of the formula AIR3, in which R is hydrocarbon residues with 2 to 8 carbon atoms, or with alkyl aluminum sesquichloride and/or alkyl aluminum dichloride, especially ethyl aluminum sesquichloride and/or dichloride ethyl aluminum. (Machine-translation by Google Translate, not legally binding)