FIELD: polymer materials.
SUBSTANCE: invention provides granules of foamable vinylaromatic polymers, which contain (a) matrix obtained via polymerization of 50-100% of one or more vinylaromatic monomers with 0-50% of at least one copolymerizable monomer; (b) 1-10% (based on the weight of above polymer) of foaming agent incorporated in polymer matrix; (c) from 2 ppm to 2% (based on the weight of polymer) of anticaking additive distributed over the surface of granules and selected from group IB and VIIIB metal oxides and mixtures thereof. Process of manufacturing above-defined granules is also described.
EFFECT: achieved suppression of conglomeration of swelled granules without loss in ability for subsequent adhesion and foaming.
10 cl, 4 ex
