Abstract: A process is described whereby homopolymers and copolymers of isobutylene are prepared by effecting the polymerization at a temperature in the range of -100.degree. to 30.degree. C in the presence of a catalyst system including:(a) a compound selected from the group consisting of: AlCl.sub.3, AlBr.sub.3, AlEtCl.sub.2, TiCl.sub.4, SnCl.sub.4, SiCl.sub.4, VCl.sub.4, BF.sub.3, Al.sub.2 Et.sub.3 Cl.sub.3, SbCl.sub.5, SbF.sub.5, FeCl.sub.3, VOCl.sub.3, ZrCl.sub.4, AlI.sub.3, GaCl.sub.3 ; and(b) a compound adapted to react with the compounds of group (a) and selected from the group consisting of: SnR.sub.4, SnRX.sub.3, SrR.sub.4, TiX.sub.2 (OR).sub.2, Ti(OR).sub.4, PbR.sub.4, Ti(OR)X.sub.3, VO(OR).sub.3, Ti(OR).sub.3 X, (C.sub.5 H.sub.5).sub.2 Ti(C.sub.6 H.sub.5).sub.2, (C.sub.5 H.sub.5).sub.2 Ti(CH.sub.3).sub.2, Ti(Acac).sub.4, SnCl.sub.2 (acetate).sub.2 in which R is a hydrocarbon radical with from 1 to 10 carbon atoms and X is a halogen atom.

Abstract: The invention relates to the preparation of oligomers starting from linear alpha-olefins and to the subsequent hydrogenation thereof to saturated oligomers products, and more particularly to the catalyst system used in the oligomer preparation reaction, the catalyst system consisting of a first component selected amongst the halogenated organo-metal aluminium components, and a second component capable of reacting with the first one and chosen amongst halogens or interhalogenic compounds and metal halides; thus higher yields of oligomers, as well as an easier performance and a control of the reaction are achieved. In turn the hydrogenation step is carried out in the presence of a known hydrogenation catalyst, at a temperature of 150 to 300.degree. C and under a pressure of from 20 to 150 atmospheres.

Abstract: A method is described for the polymerization of isobutylene and, in particular, the copolymerization of isobutylene and isoprene to produce butyl rubber, by contacting the monomers with a catalyst prepared from: (a) an organoaluminum compound (e.g. Al(C.sub.2 H.sub.5).sub.2 Cl) and (b) a compound represented by the formula X'.sub.n M.sub.e Y.sub.m in which X' is a halogen atom; Y is oxygen, sulphur or a functional group selected from the alkoxies, esters, amides, simple or substituted alkyls, cycloalkyls, aromatics, arenes, phosphines, acetylacetones and oximes; Me is an element selected from Ti, Sn, Zn, B, Al, Hg, Pb, W, Sb, Ge, V, Zr, As, Bi and Mo; n and m are whole numbers whose sum equals the valence of Me except where Y is oxygen or sulphur, when the valency equals 2m + n, (e.g. Ti(O nC.sub.4 H.sub.9)Cl.sub.3), in a liquid reaction medium constituted by an aliphatic, aromatic, cycloaliphatic or halogenated hydrocarbon such as methyl chloride, and at a temperature in the range from -100.degree. to 30.