| abstract |
The foamable extruded polystyrene particles, provided with an ultraviolet absorbing brightener that is incorporated into the particles, wherein the polystyrene particles are rod-shaped, producing extruded particles of granulate with a substantially uniform grain size, wherein the granulate particles have a diameter of 0.3 to 2. mm, preferably 0.5 to 1.2 mm, and a length of 1 to 4 mm, preferably 1.3 to 2.5 mm, containing at least one such brightener, where the brightening ratio is 0.0001 to 0.01 % by weight. |