FIELD: polymers.
SUBSTANCE: invention relates to method for production of polyisoprene with increased content of cis-1,4-sequences from isoprene-enriched C5-cut from vapor-phase naphtha cracking. Claimed method includes interaction of isoprene-enriched C5-cut from vapor-phase naphtha cracking in presence of catalytic system. Isoprene content in said cut is 30-95 mass %, and catalytic system is based on at least one conjugated diene monomer, salts of one or more rear earth metals with organophosphoric acid, alkylation agent, namely aluminum alkyl of formula AlR3 or HalR2 and halogen donor namely halogenated aluminum alkyl. Abovementioned salt is in slurry, in at least one inert hydrocarbon solvent representing aliphatic or alicyclic hydrocarbon containing in said catalytic system, wherein molar ratio of alkylation agent to rear earth metal salt is in range of 1-5.
EFFECT: isoprene polymerization with high catalytic activity; product having increased content of cis-1,4-sequences.
21 cl, 3 tbl, 3 ex
