Process for preparing conjugate diolefins, and means suitable for this purpose

Abstract From the Canadian patent

A new process is described for polymerising and copolymerising conjugate diolefins characterised by the use of a catalytic system comprising at least one compound of Group III B of the periodic system at least, one non-halogenated aluminium alkyl at least one compound containing, one or more hydroxyls of acid or neutral type and possibly an inorganic, compound containing Cl or Br in ionisable form or an organic halogen derivative. The new process allows the preparation both in the absence, and in the presence of an inert diluent of polydiolefins of essentially, entirely 1,4-cis structure which even in the absence of a purification stage contain a very small quantity of catalytic residues.