Abstract: A process for the stereospecific polymerization of .alpha.-olefins which comprises polymerizing an .alpha.-olefin with a catalyst comprising (A) the reaction product of a magnesium compound and a titanium compound and (B) an organo-aluminum compound. Component (A) is prepared by reacting a (i) magnesium compound of the formula Mg(OR.sup.1).sub.n X.sup.1.sub.2-n wherein R.sup.1 contains from 1 to 10 carbon atoms and is an alkyl group, a cycloalkyl group, an aryl group, or an aralkyl group, X.sup.1 is a halogen atom, and n is a real number of from 1.0 to 2.0, with (ii) at least one halogen-containing compound selected from the group consisting of halogenated hydrocarbons, oxygen-containing halogenated hydrocarbons, halogenated thionyls, halogen-containing phosphorus compounds and halogen-containing nitrogen compounds, and (iii) an oxygen-containing titanium compound of the formula Ti(OR.sup.2).sub.4 wherein R.sup.

Abstract: A process for producing an improved titanium catalyst for use in the polymerization of olefins comprising heating a magnesium dialkoxide and an alcohol adduct of a magnesium dihalide to form a solid product, treating said solid product with an alcohol to form an alcohol treated solid product, and then reacting said alcohol treated solid product with a halogen-containing titanium compound. The reaction product of said alcohol treated solid product with the halogen-containing titanium compound may optionally be reacted with an organoaluminum compound. The products of the processes described in the preceding two sentences is an improved titanium catalyst which is generally used with an organoaluminum olefin polymerization cocatalyst.

Abstract: Block copolymers of (i) a polymer of ethylene or propylene, or copolymer of ethylene or propylene with another .alpha.-olefin and (ii) a polymer of an acrylic ester or a methacrylic ester are formed by polymerizing (i) in the presence of a titanium halide and an organic aluminum compound, and then adding in order (a), (b) and (c) to copolymerize a product so obtained with (a) an acrylic ester or a methacrylic ester, in the presence of (b) an organic phosphorus compound or tertiary amine and (c) a benzyl halide, a ring-alkylated benzyl halide, a benzyl halide in which a methylene hydrogen is replaced with an alkyl or aryl group, or an alkyl halide.

Abstract: Process for producing cyclic polyenes having the general formula ##EQU1## WHEREIN N IS AT LEAST 2 BY CONTACTING CYCLOPENTENE WITH A COMPLEX CATALYST OF (I) TRIALKYL ALUMINUM, (II) WOLFRAM HEXAHALIDES AND (III) ALLYL HALIDES OR METHALLYL HALIDES. The invention also provides novel 15 carbon cyclic polyenes.