FIELD: chemistry.
SUBSTANCE: present invention relates to a method of polymerising a styrene monomer in the presence of a bromated fire retardant. Described is a method for suspension polymerisation of a styrene monomer to obtain polystyrene, the method comprising steps of: a) heating a polymerisation suspension containing a styrene monomer to at least 60°C, b) feeding an initiator into said heated polymerisation suspension during a polymerisation reaction for a period of 2-4 hours continuously or periodically in at least two portions, wherein said period begins at monomer conversion of 65% or less, and said initiator is characterised by half-life, at temperature at which said initiator is fed, of not more than 60 min, where during the polymerisation reaction, the bromated fire retardant is present in the polymerisation suspension.
EFFECT: polymerising styrene in the presence of a bromated fire retardant to obtain polystyrene, having at least the same molecular weight as polystyrene obtained in the absence of a fire retardant.
11 cl, 2 tbl, 9 ex
