FIELD: polymer production.
SUBSTANCE: process comprises: polymerization in aqueous suspension of at least one vinylaromatic monomer in presence of suspending agent selected from phosphoric acid salts; discharging foamed granules from reaction vessel; washing thus obtained granules with aqueous solution containing 0.005-2% by weight nonionic surfactant; separating washed granules, whose surface contains no inorganic phosphoric acid salts; and drying these granules in air flow.
EFFECT: achieved lack of foam in effluent after washing of polymer being foamed.
8 cl, 1 tbl, 4 ex
