Compositions of expandable vinyl aromatic polymers with an improved thermal insulation capacity, process for their production and expanded articles obtained therefrom

摘要

Expandable vinyl aromatic polymers comprising:a matrix obtained by polymerizing 50-100% by weight of one or more vinyl aromatic monomers and 0-50% by weight of at least one co-polymerizable monomer;1-10% by weight, calculated with respect to polymer (a), of an expanding agent embedded in the polymeric matrix;0-25% by weight, calculated with respect to polymer (a), of a filler comprising carbon coke having an average diameter of between 0.5 and 100 μm, with a surface area, measured according to ASTM D-3037/89, ranging from 5 to 200 m²/g;0.05-10% by weight, calculated with respect to polymer (a), of expanded graphite in particle form, with a particle average diameter (size) ranging from 1 to 30 μm, a surface area, measured according to ASTM D-3037/89, ranging from 5 to 500 m²/g and a density ranging from 1.5 to 5 g/cm³.