FIELD: chemistry.
SUBSTANCE: invention describes a foamed vinylaromatic polymer containing a) a matrix obtained via polymerisation of 100 wt % vinylaromatic monomer; b) 1-10 wt % (per amount of polymer (a)) foaming agent incorporated in the polymer matrix; c) 0.01-25 wt % (per amount of polymer (a)) technical carbon, characterised by average diametre between 30 and 2000 nm, specific surface area between 5 and 40 m2/g, sulphur content between 0.1 and 1000 parts per million and ash content between 0.001 and 1%; d) 0-10 wt % (per amount of polymer (a)) graphite; e) 0-10 wt % (per amount of polymer (a)) aluminium; f) 0-10 wt % (per amount of polymer (a)) antimony trisulphide, provided that the total amount of components (a)-(f) equals 100, and that concentration of matrix (a) is not less than 80 wt % and at least one of (d)-(f) is present. The invention also describes a foamed article having density between 5 and 50 g/l, characterised by thermal conductivity between 25 and 50 mW/mK, obtained after foaming at temperature several times higher than the glass transition point of the polymer and granules of the vinylaromatic polymer given above. Described is a method of improving insulating capacity of the foamed vinylaromatic polymer given above.
EFFECT: improved insulating capacity of the foamed product.
13 cl, 6 ex
