C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08J 9/224 (2006.01)
Patent
CA 2605058
Process for improving the insulating capacity of expanded vinyl aromatic 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 englobed in the polymeric matrix, 0.001-25% by weight, calculated with respect to the polymer (a) , of an athermanous additive comprising carbon black homogeneously distributed in the polymeric matrix,- and 0-10%by weight, calculated with respect to the polymer (a) of graphite, and/or aluminum, and/or antimonium trisulf ide and/or an inorganic derivative of silicon or magnesium; 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~C.
L'invention concerne un procédé qui permet d'améliorer la capacité isolante d'un polymère vinyl-aromatique expansé qui consiste: 1) à préparer des billes de polymères vinyl-aromatiques pouvant être expansées contenant de 1 à 10 % en poids, calculé par rapport au polymère, d'un agent d'expansion englobé dans la matrice polymère, et de 0,001 à 25 % en poids, calculé par rapport au polymère (a), d'un additif athermane comprenant du noir de charbon distribué de manière homogène dans la matrice polymère; 2) à traiter la surface des billes avec un agent lubrifiant liquide, avant le dépôt du revêtement; et 3) à traiter thermiquement les billes à l'air chaud à une température comprise entre 30 et 60 °C.
Ghidoni Dario
Ponticiello Antonio
Simonelli Alessandra
Zamperlin Loris
Fetherstonhaugh & Co.
Polimeri Europa S.p.a.
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