EXPANDED ARTICLES WITH EXCELLENT RESISTANCE TO SOLAR RADIATION AND OPTIMUM THERMOINSULATING AND MECHANICAL PROPERTIES.

摘要

Thermoinsulating expanded articles with improved resistance to solar irradiation, which comprise an expanded polymeric matrix, obtained by expansion and sintering of beads/granules of a vinyl aromatic (co) polymer, in whose interior a filler is homogeneously dispersed, which comprises at least one athermanous material selected from coke, graphite and carbon black and optionally an active inorganic additive within the wave-lengths ranging from 100 to 20,000 cm^-1. The polymeric matrix comprises a copolymer of styrene and at least one vinyl aromatic comonomer substituted in the ring or on the vinyl group and/ or a mixture of polystyrene and up to 10% by weight, with respect to the mixture, of a thermoplastic polymer compatible with polystyrene and having a Tg (glass transition temperature) > 100°C.