Beads of expandable vinylaromatic polymers and process for...

Details Beads of expandable vinylaromatic polymers and process for... Beads of expandable vinylaromatic polymers and process for...

C - Chemistry, Metallurgy

08

J

C08J 9/224 (2006.01) C08J 9/00 (2006.01)

Patent

CA 2493308

Beads of expandable vinylaromatic polymers which comprise: a) a matrix obtained by polymerizing 50-100% by weight of one or more vinylaromatic monomers and 0-50% by weight of at least one copolymerizable monomer; b) 1-10% by weight, calculated with respect to the polymer (a), of an expanding agent englobed in the polymeric ma trix; c) 2 ppm-2% by weight, calculated with respect to the poly mer (a), of an anti-lumping additive, distributed an the surface of the beads, comprising Oxides of metals of groups IB, IIB and VIIIB.

L'invention concerne des perles de polymères vinylaromatiques expansibles, comprenant : a) une matrice obtenue par polymérisation de 50 à 100 % en poids d'un ou de plusieurs monomères vinylaromatiques et 0 à 50 % en poids d'au moins un monomère copolymérisable ; b) 1 à 10 % en poids, par rapport au poids total du polymère (a), d'un agent d'expansion enrobé dans ladite matrice polymère ; c) 2 ppm-2 % en poids, par rapport au poids total du polymère (a), d'un additif antiagglomérant réparti sur la surface des perles, cet additif comprenant des oxydes de métaux des groupes IB, IIB et VIIIB.

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