PROCESS FOR PRODUCTION OF ATACTIC POLYOLEFINS

1,237,048. Atactic polyolefins. SCHOLVENCHEMIE A.G. 27 June, 1969 [28 May, 1968], No. 32644/69. Heading C3P. Atactic homo- or co-polymers of α-olefins excluding ethylene, are prepared by polymerization using a catalyst comprising a trivalent titanium compound and an alkylaluminium fluoride of the formula AlR 3-n F n , wherein R is C 1-10 , alkyl and n is 0À5-1À5. The examples describe the polymerization of propylene using beta titanium trichloride (prepared by reduction of titanium tetrachloride with diethylaluminium chloride in n - hexane) and Al- (C 2 H 5 ) 2 . 5 F 0 . 5 , Al(i-C 4 H 9 ) 2 F and Al(C 2 H 5 ) 2 F in hexane, p-xylol and heptane as solvents. The polymerization is stopped by addition of propanol or methanol and the product is isolated by steam distillation. Hydrogen is present as a molecular weight regulator.