POLYMERIZATION CATALYST COMPOSITION, METHOD FOR SYNTHETIC POLYISOPRENE PRODUCTION , AND SYNTHETIC POLYISOPRENE Russian patent published in 2017 - IPC C08F4/54 C08F136/08 C08F36/08 

FIELD: chemistry.

SUBSTANCE: invention relates to a catalyst composition for isoprene monomer polymerization. The composition comprising: component (A), representing a compound of the general formula (i): M-(NQ¹)(NQ²)(NQ³), … (i), where M represents at least one element selected from lanthanide element, scandium and yttrium, NQ¹, NQ² and NQ³ are amide groups, which are identical or different and each has an M-N bond; component (B), representing a hydrocarbyl aluminoxane compound containing a hydrocarbon group characterized by the number of carbon atoms ranging from 1 to 20; and component (C), which is a compound of the general formula (X): YR¹_aR²_bR³_c, … (X), where Y is a metal selected from group 13 of the periodic table, R¹ and R² represent hydrocarbon groups, characterized by the number of carbon atoms ranging from 1 to 10, or hydrogen atoms, and R³ is a hydrocarbon group, characterized by the number of carbon atoms ranging from 1 to 10, wherein R¹, R² and R³ are identical or different and a=1, b=1 and c=1. The molar ratio of the isoprene monomer component (A) and component (C) are: (isoprene monomer)/(component (A)) is 5000 or more; (Isoprene monomer)/(component (C)) is 5000 or less. The content of component (B) is 10 or more times higher in terms of moles, as compared with component (A) content. A method for synthetic polyisoprene production, and synthetic polyisoprene are proposed as well.

EFFECT: application of the proposed catalyst composition provides a high molecular weight polyisoprene, and a rubber composition characterized by good durability under harsh operating conditions.

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