Expandable vinylaromatic polymers and process for their...

Details Expandable vinylaromatic polymers and process for their... Expandable vinylaromatic polymers and process for their...

C - Chemistry, Metallurgy

08

J

C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08L 25/04 (2006.01)

Patent

CA 2519911

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 a copolymerizable monomer; b) 1-10 % by weight, calculated with respect to the polymer (a) of an expanding agent englobed in the polymeric matrix; c) 0.01-20 % by weight, calculated with respect to the polymer (a) of carbon black distributed in the polymeric matrix having an average diameter ranging from 30 to 2000 nm, a surface area ranging from 5 to 40 m2/g, a sulfur content ranging from 0.1 to 2000 ppm and an ash content ranging from 0.001 to 1 %.

L'invention concerne des polymères vinylaromatiques expansibles qui comprennent : a) une matrice obtenue par la polymérisation de 50-100 % en poids d'un ou de plusieurs monomères vinylaromatiques et de 0-50 % en poids d'un monomère copolymérisable ; b) 1-10 % en poids, calculé par rapport au polymère (a), d'un agent d'expansion inclus dans la matrice polymère ; c) 0,01-20 % en poids, calculé par rapport au polymère (a) de noir de carbone réparti dans la matrice polymère et qui présente un diamètre moyen compris entre 30 et 2000 nm, une surface comprise entre 5 et 40 m?2¿/g, une teneur en soufre comprise entre 0,1 et 2000 ppm et une teneur en cendres comprise entre 0,001 et 1 %.

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