PREPARATION OF CATALYST PASTE FOR OLEFIN POLYMERISATION Russian patent published in 2012 - IPC C08F110/00 C08F4/649 C08F4/642 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing a catalyst composition in form of catalyst particles dispersed in a semi-liquid matrix. Described is a method of producing a catalyst composition for polymerisation of olefins in form of a dispersion of catalyst particles in a semi-liquid matrix, characterised by that said method comprises steps for: forming a suspension of catalyst particles in oil by loading, while stirring continuously, dry catalyst powder into a tank containing said oil, wherein the rate of loading the catalyst powder per metre of the oil boundary surface is less than 800 kg/h*m²; adding, while stirring, molten thickener having melting point ranging from 30 to 70°C, while holding the catalyst suspension in oil at such a temperature that said thickener solidifies upon contact with said suspension, wherein said oil has dynamic viscosity at 100°C ranging from 1 to 12 cP, and said catalyst particles fed into the tank at step a) are Ziegler-Natta catalyst components based on a titanium halide deposited on a magnesium halide. Described also is an olefin polymerisation method, which is realised in the presence of a solid polymerisation catalyst, wherein said solid polymerisation catalyst is treated and transferred into a polymerisation reactor through the following steps for: a) forming a suspension of catalyst particles in oil by loading, while stirring continuously, dry catalyst powder into a tank containing said oil, wherein the rate of loading the catalyst powder per m² of the oil boundary surface is less than 800 kg/h*m²; b) adding, while stirring, molten thickener having melting point ranging from 30°C to 70°C, while holding the catalyst suspension in oil at such a temperature that said thickener solidifies upon contact with said suspension; c) the catalyst paste from step b) is brought into contact with an organoaluminium compound in the presence of an inert hydrocarbon, possibly an electron-donor compound, at temperature from 5°C to 30°C; d) polymerisation of one or more α-olefins of formula CH₂=CHR, where R denotes hydrogen or a hydrocarbon radical having 1-12 carbon atoms, in one or more polymerisation reactors in the presence of the catalyst from step c), wherein said oil has dynamic viscosity at 100°C ranging from 1 to 12 cP, and said catalyst particles which are fed into the tank at step a) are Ziegler-Natta catalyst components based on a titanium halide deposited on a magnesium halide.

EFFECT: preserving morphology of catalyst particles.

17 cl, 2 tbl, 1 dwg, 6 ex