Patent ID: 9279041
Filing Date: 2016-03-08
CPC Classification: C08J,C08K,C08L

Claim Text:
1. A vinyl aromatic polymer foam obtained from expanded vinyl aromatic polymer particles, wherein the expanded vinyl aromatic polymer particles are obtained from an expandable vinyl aromatic polymer comprising: a) a matrix of a vinyl aromatic polymer, b) 1-10% by weight, calculated with respect to the vinyl aromatic polymer (a), of a blowing agent embedded in the matrix, c) 0.1 to 5% by weight, calculated with respect to the vinyl aromatic polymer (a), of talcum having a D50 particle size, measured by sedigraph (ISO 13317-3), of between 2.3 and 5 μm and a BET specific surface area, measured according to DIN 66131/2, of between 4.2 and 9.5 m d) 0.1 to 6% by weight, calculated with respect to the vinyl aromatic polymer (a), of carbon black with a BET specific surface area, measured according to ASTM D-6556, of between 9 and 65 m e) 0.1 to 1% by weight, calculated with respect to the vinyl aromatic polymer (a), of polyethylene wax homogenously distributed in the matrix, wherein the vinyl aromatic polymer foam has i) a mean cell size between 80 and 200 μm, ii) a standard deviation of the mean cell size lower than 50 μm, iii) a thermal conductivity λ lower than 32 mW/mK (ISO 8301), and iv) a density lower than 22 g/L.