FIELD: chemistry.
SUBSTANCE: described is a method of producing ethylene-propylene rubber via copolymerisation of ethylene and propylene in the medium of a hydrocarbon solvent. Copolymerisation takes place in the presence of a cyclic diene comonomer or without, while using a catalyst system based on an organoaluminium compound, vanadium chloride or vanadium oxychloride, a catalyst reactivator and a chain-terminating agent. The method also involves washing, stabilising, degassing and drying the polymer. The copolymerisation reaction is interrupted by adding to the reaction mixture a monoester of a diatomic alcohol in such an amount that, the molar ratio of said monoester to the total amount of metals in the catalyst system is in the range of 0.48-0.8:1.
EFFECT: high degree of extraction of variable-valence metals from the polymer solution and low fraction of uncontrolled branching of the ready cyclic diene.
1 tbl, 15 ex
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Authors
Dates
2011-11-20—Published
2010-06-03—Filed