CATALYST FOR STEREOSPECIFIC POLYMERIZATION OF PROPYLENE AND METHOD OF PREPARATION THEREOF Russian patent published in 1997 - IPC

FIELD: catalysts for olefin polymerization processes. SUBSTANCE: catalyst containing titanium tetrachloride and electronodonor compound on carrier containing complex compound with general formula MgCl₂•Q where Q is polymer hydrocarbon compound with H/C molar ratio 2.18-2.30 and molecular weight 140-340 incorporated into magnesium chloride structure in quantity 4.2-13.4% based on carrier weight is distinguished by catalyst carrier's being MgCl₂•Q/O₂ interaction product and contents of titanium tetrachloride and electronodonor compound being, respectively, 6.46-11.68 and 2.54- 15.73. In a method of preparing catalyst including grinding carrier containing complex compound MgCl₂•Q as defined above, treating it by electronodonor compound and then by titanium tetrachloride followed by washing catalyst mass with hydrocarbon solvent and drying, novelty consists in that, MgCl₂•Q, prior to be treated by titanium tetrachloride, is subjected to interaction with an oxygen-containing gas at temperature varying over the range from 0 to 150 C for 0.5 to 100 h. The latter reaction may be conducted either in fixed or fluidized layer, or when grinding complex compound. According to invention, oxygen-containing gas may be either air or oxygen, or oxygen-inert gas mixture with oxygen content 2-50 vol.% and moisture content 0.0005- 0.002 wt %. EFFECT: increased catalyst activity.