GB998601A - Method for producing stereo-regular polymers of olefines - Google Patents

Abstract

Stereoregular polyolefines are produced by contacting an olefine with a catalyst consisting of a transition heavy metal halide, a zinc, cadmium or mercury alkyl compound, and at least one of the following: (A) nitrogen-containing organic compounds having no direct linkage between the nitrogen and hydrogen atoms, (B) phosphine derivatives PR3, where R is chosen from alkyl, aryl, aralkyl and cycloalkyl radicals, (C) ethers and (D) phosphoric and phosphorous acid esters. The transition heavy metal is a metal belonging to Group IVa, Va, VIa and VIII of the Mendel<\>aeeff Table. Compounds (A) may be tertiary alkylamines, tertiary arylamines, tertiary arylalkylamines, heterocyclic nitrogeneous compounds, condensed heterocyclic nitrogeneous compounds, acid amide derivatives, urea and thiourea derivatives. Extensive lists of catalyst components are given. The polymerization may be carried out in an inert liquid hydrocarbon medium. In the examples, propylene is polymerized using as catalyst (a) diethyl zinc, titanium trichloride prepared by reducing titanium tetrachloride with hydrogen and one of the following triethylamine, pyridine, acridine, hexamethylphosphoric triamide, triphenylphosphine, tetrahydrofuran and dimethylformamide or (b) diethyl cadmium, titanium trichloride prepared by reducing titanium tetrachloride with aluminium and one of the following trimethylamine, triethylphosphite and N,N-diethylaniline.