FIELD: chemistry.
SUBSTANCE: described is a foaming polystyrene composition in form of granules, containing: (1) 100 pts. wt polystyrene, preferably with average molecular weight Mw ranging from 150000 to 400000 Da, (2) 3 to 20 pts. wt of foaming agent, which is water or a mixture of water and at least one other foaming agent, for example, hydrocarbon, (3) 0.1 to 12 pts. wt of at least one modified clay, with at least a partial lipophilic property. Also described is a method of producing a foaming polystyrene composition in form of granules, which involves polymerisation of styrene and optionally at least one comonomer, which is brought into an aqueous suspension and mixing by reacting 100 pts. wt styrene and optionally a comonomer or comonomers with at least one radical polymerisation initiator and at least one suspension agent. This method is characterised by that, the reaction process is also carried out in the presence of (a) 4 to 23 pts. wt of foaming agent, which is water or a mixture of water and at least one other foaming agent, for example hydrocarbon foaming agent, and (b) 0.5 to 12 pts. wt of at least one modified clay, with at least a partial lipophilic property. Described also is use of the said foaming polystyrene composition in form of granules in making moulded and foamed objects, preferably with bulk density ranging from 5 to 50 kg/m3, preferably from 5 to 30 kg/m3.
EFFECT: increased effectiveness of the composition.
17 cl, 6 ex
