Patent ID: 8114476
Filing Date: 2012-02-14
Classification: C08J

Abstract:
1. A process for improving the insulating capacity of expanded vinyl aromatic polymers which comprises: 1) preparing beads of expandable vinyl aromatic polymers containing 1-10% by weight, calculated with respect to the polymer, of an expanding agent incorporated in the polymeric matrix, and 0.01-25% by weight, calculated with respect to the polymer, of an athermanous additive comprising carbon black homogeneously distributed in the polymeric matrix with an average diameter ranging from 30 to 2000 nm, a surface area ranging from 5 to 40 m 2) treating the surface of the beads with a liquid lubricating agent selected from the group consisting of: 3) thermally treating the beads with hot air at a temperature ranging from 30 to 60° C.