FIELD: manufacture of plastic materials, more particularly suspension polystyrene. SUBSTANCE: present invention describes method for preparing polystyrene by polymerization in suspension at 85-90 C and pressure of 525-700 mm Hg in the presence of initiator and suspension stabilizers at water to monomer weight ratio of 0.5-0.33, subsequently adding demineralized water in amount of 4 % by weight of aqueous phase, increasing pressure to 1-1.5 atm and temperature to 130 C. EFFECT: more efficient preparation method.
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