DIENE RUBBER PRODUCTION PROCESS Russian patent published in 1998 - IPC

FIELD: rubber industry. SUBSTANCE: invention relates to high-molecular compounds technology, namely to producing stereoregular polydienes utilizing Ziegler-Natta catalyst systems. Butadiene (co)polymers are produced via diene (co)polymerization in aromatic solvent with catalysts based on rare- earth elements of lanthanide series in battery of consecutively connected more than three reactors. (Co)polymerization is followed by special process stages. Butadiene may be copolymerized with isoprene. Monomer solution in charge solvent is portionwise fed into the two first reactors when the first one receives 10 to 90 wt % of charge or into the three first reactors, each of them receiving 10 to 80 wt % of charge. Catalyst is also fed portionwise: into the first and third or into the first and second reactors, the first one receiving 10 to 90% of lanthanide based on its total weight or all amount of catalyst. EFFECT: enhanced process efficiency. 2 tbl