FIELD: polymer production. SUBSTANCE: vinylaromatic polymers optionally containing ethylenically- unsaturated nitrile are produced continuously in bulk or in solution through free-radical (co)polymerization reaction. Reaction blend containing at least one vinylaromatic monomer is charged into at least one tubular piston flow-type reactor and process involves recycling, recycle portion being determined by ratio of recycling stream velocity to charged stream velocity below 4. EFFECT: utilized advantages of piston flow reactor and flow reactor with stirrer avoiding imperfections thereof. 4 cl, 1 dwg, 5 ex
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