FIELD: chemistry.
SUBSTANCE: present invention relates to a multicomponent catalyst system for 1,4-cis-stereospecific polymerization of isoprene based on at least: isoprene, as a preforming monomer; a metal salt of the rare earth element of organophosphorus acid; an saturated inert aliphatic or alicyclic hydrocarbon solvent containing 5 carbon atoms, the boiling point of which is less than 40 °C at atmospheric pressure; alkylating agent, which is a trialkylaluminum of the formula AlR3, in which R represents an alkyl radical containing from 1 to 10 carbon atoms, selected from trimethylaluminum, triethylaluminum, tri-n-propyl aluminum, triisopropylaluminum, tri-n-butylaluminum, tri-t-butylaluminum, tri-n-pentylaluminium, tri-n-hexyl aluminum, tri-n-octylaluminum, tricyclohexylaluminum, and a halogen donor, which is an alkyl aluminum halide, the alkyl radical of which preferably contains from 1 to 8 carbon atoms. Moreover, this catalytic system contains rare earth metal in a concentration equal to or greater than 0.005 mol/l and up to 0.1 mol/l. Also, a process for the preparation of the above-mentioned catalyst composition and a process for the synthesis of polyisoprene having a high content of 1,4-cis units in the presence of such a catalyst system are disclosed.
EFFECT: development of a catalytic system with good catalytic activity that helps to prevent clogging of industrial plants to produce catalysts and lines used to inject catalysts into the polymerization reactor, which significantly reduces energy costs in the production of polyisoprene with a high content of 1,4-cis-units.
21 cl, 1 dwg, 4 tbl
