A flame-retardant, expandable styrene polymer (EPS) granulates with flame retardant synergist in the coating

A flame-retardant, expandable styrene polymer (EPS) granulates, which as a flame retardant an organic bromine compound having a bromine content of at least 70 wt .-%, and a flame retardant synergist, wherein at least a part of the flame retardant synergist is present in form of a coating, and to processes for their preparation and use for self-extinguishing styrene polymer particle foams.