Process for improving the insulating capacity of expanded vinyl aromatic polymers and the products thus obtained
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United States of America Patent
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Feb 14, 2012
Grant Date -
Jan 27, 2011
app pub date -
Oct 1, 2010
filing date -
Apr 15, 2005
priority date (Note) -
Expired
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Abstract
Process for improving the insulating capacity of expanded vinyl aromatic which includes: 1) preparing beads of expandable vinyl aromatic polymers containing 1-10% by weight, calculated with respect to the polymer, of an expanding agent englobed 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; 2) treating the surface of the beads, before deposition of the coating, with a liquid lubricating agent; and 3) thermally treating the beads with hot air at a temperature ranging from 30 to 60.degree. C.
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