GB1295743A - - Google Patents

Abstract

1295743 Polymerization catalyst for α-olefins FARBWERKE HOECHST AG 21 Aug 1970 [22 Aug 1969] 40443/70 Heading C3P The polymerization of α-olefins is carried out at 20‹ to 200‹ C. under a pressure of up to 50 atm. using as catalyst a combination of (A) the reaction product of a tetravalent halogencontaining titanium compound with a magnesium halide containing an alcohol of crystallization and (B) an organo-aluminium compound. Component (A) is preferably prepared by suspending in an inert liquid a halide of formula MgX 2 .nROH, where X is Cl, Br or I, n is 0À1 to 6 and ROH is any alcohol having up to 20 C atoms, treating it with a titanium compound of formula TiX n (OR) 4-n , where n is 1 to 4, X is Cl or Br and R is a hydrocarbon group having up to 18 C atoms, and collecting the solid product. This may be mixed with other inert inorganic substances prior to reaction with the aluminium compound, which is preferably of the type AlR 3 , AlR 2 Cl, Al 2 R 3 Cl 3 or the product of AlR 3 or AlR 2 H with a diene. The polymerization may be carried out in the presence of hydrogen, forming up to 80 vol. per cent of the gas phase if extrudable polymers are required or 80-100 vol. per cent to give polyolefin waxes. The examples describe the polymerization of ethylene, alone or mixed with propylene or 1- butene, using a catalyst comprising (A) the reaction product of magnesium chloride containing ethanol or isopropanol of crystallization with TiCl 4 or TiCl 2 (Oi-Pr) 2 and (B) AlEt 3 , Al(i-Bu) 3 or AlEt 2 Cl. When the chlorine containing aluminium compound was used the catalyst was washed with a hydrocarbon solvent and activated with Al(i-Bu) 2 H before use.