Compositions based on expandable vinylaromatic polymers with...

Details Compositions based on expandable vinylaromatic polymers with... Compositions based on expandable vinylaromatic polymers with...

C - Chemistry, Metallurgy

08

J

C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08L 25/04 (2006.01) C08L 25/06 (2006.01) C08L 25/08 (2006.01) C08L 71/12 (2006.01)

Patent

CA 2479359

Compositions of expandable vinylaromatic polymers which contain a polymer, of at least one vinylaromatic monomer, having an average molecular weight Mw ranging from 50,000 to 170,000, which comprise: a) 0-50% by weight of a copolymer obtained by polymerizing one or more vinylaromatic monomers and 0.1- 15% by weight of an .alpha.-alkylstyrene; b) 0-10% by weight of a compatible polymer having a crystallinity lower than 10% and a glass transition temperature (Tg) higher than 100~C, the remaining percentage consisting of the vinylaromatic polymer; c) 2-10% by weight, calculated with respect to the total, of an expanding agent; with the proviso that at least one of (a) or (b) is present in the polymeric mixture.

Cette invention a trait à des compositions à base de polymères vinyl-aromatiques, contenant un polymère, issu d'au moins un monomère vinyl-aromatique, dont le poids moléculaire moyen (Mw) est compris entre 50 000 et 170 000. Ces compositions contiennent, en pourcentage pondéral, (a), de 0 à 50 % d'un copolymère obtenu par polymérisation d'un ou de plusieurs monomères vinyl-aromatiques et de 1 à 15 % d'un alkylstyrène-A, (b), de 0 à 10 % d'un polymère compatible dont la cristallinité est inférieure à 100 % et dont la température de transition vitreuse (Tg) est supérieure à 100 ·C, le pourcentage restant étant constitué du polymère vinyl-aromatique et, (c), de 2 à 10 %, pourcentage calculé par rapport au pourcentage total, d'un agent d'expansion, à la condition qu'au moins la substance (a) ou (b) soit présente dans le mélange polymère.

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