PROCESS FOR PREPARING STABILIZED POLYPROPYLENE Russian patent published in 1996 - IPC

FIELD: industry of plastic materials. SUBSTANCE: in the claimed process for preparing stabilized polypropylene by polymerization the titanium-magnesium catalyst is product of subsequent reaction of titanium tetrachloride with microspherical adduct of magnesium chloride with ethanol of formula: MgCl₂•2C₂H₅OH and 2,2-dialkyl-1,3-dialkoxyalane and additional treatment of the resulting solid residue with titanium tetrachloride, recovery and washing of the resulting solid product. Titanium tetrachloride to magnesium chloride to 2,2-dialkyl-1,3-dialkoxyalkane molar ratio is 1:15.1:1.3. EFFECT: more efficient preparation process.