EXPANDABLE VINYL AROMATIC POLYMERS
World Intellectual Property Organization Patent
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Abstract
The present invention is an expandable vinyl aromatic polymer which comprises: a ) a matrix of a vinyl aromatic polymer, b ) 1-10% by weight calculated with respect to the polymer (a), of an expanding agent englobed in the polymeric matrix, c ) 0.1 to 5% by weight calculated with respect to the polymer (a), of PiB (polyisobutene), homogeneously distributed in the polymeric matrix, d ) 0-20% by weight, calculated with respect to the polymer (a), of one or more fillers, other than PiB, homogeneously distributed in the polymeric matrix, Wherein the proportion of PiB is adjusted to increase the Melt Flow Index (MFI) from an initial index to a final index such as the 10% compression strength of the foam made with said expandable vinyl aromatic polymer of the final index is essentially the same or higher than the foam made with said expandable vinyl aromatic polymer of the initial index. The expandable vinyl aromatic polymer of the invention is produced in the form of beads or granules. In an embodiment the expandable vinyl aromatic polymer comprises carbon black in a proportion sufficient for the foamed material obtained from the expandable vinyl aromatic polymer to have a thermal conductivity λ of about 34 mW/m°K or lower.
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