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) C08J 9/20 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2462137

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) l-10% by weight, calculated with respect to the polymer (a), of an expanding agent englobed in the polymeric matrix; c) 0.05-25% by weight, calculated with respect to the polymer (a), of an inorganic filler homogeneously distributed in the polymeric matrix with a substantially spherical granulometry, an average diameter ranging from 0.01 to 100 ~m, a refraction index higher than l.6 and a white index, as defined in "Colour Index" (third edition published by the Society of Dyers and Colourists, 1982), equal to or lower than 22.

Polymères vinylaromatiques expansibles qui contiennent (a) une matrice obtenue par polymérisation de 50 à 100 % en poids d'un ou plusieurs monomères vinylaromatiques et 0,50 % en poids d'un monomère copolymérisable, (b) 1 à 10 % en poids, calculé par rapport au polymère (a), d'un agent d'expansion englobé dans la matrice polymère, et (c) 0,05 à 25 % en poids, calculé par rapport au polymère (a), d'une charge inorganique répartie de manière homogène dans la matrice polymère, ayant des grains de forme pratiquement sphérique, de diamètre moyen situé entre 0,01 et 100 µm, un indice de réfraction supérieur à 1,6 et indice de blanc, tel que défini dans le "Colour Index" (troisième édition publiée par la Society of Dyers and Colourists, 1982), égal ou inférieur à 22.

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