Composite material based on vinyl aromatic polymers having...

C - Chemistry – Metallurgy – 08 – J

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C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08K 3/04 (2006.01)

Patent

CA 2684685

Expandable particle composite material suitable for the preparation of expanded materials having a density lower than 40g/l and a content of closed cells of at least 60%, characterized by the presence of heterophase cavities and/or heterophase domains, whose matrix is a synthetic thermoplastic resin having at least 60% by weight of a vinyl aromatic polymer and in which an expanding system is contained, together with a heterogeneously distributed graphite material, having a graphitization degree, calculated by means of the Maire and Mering formula, of at least 0.2.

L'invention concerne un matériau composite particulaire expansible conçu pour préparer des matériaux expansés présentant une densité inférieure à 40g/l et une teneur en cellules fermées d'au moins 60 %. Le matériau de l'invention est caractérisé par la présence de cavités hétérophases et/ou de domaines hétérophases dont la matrice est une résine thermoplastique synthétique présentant au moins 60 % en poids d'un polymère vinyle aromatique et dans lesquels un système d'expansion est contenu conjointement à un matériau de graphite hétérogènement distribué présentant un degré de graphitisation, calculé à l'aide des formules de Maire et de Mering, d'au moins 0,2.

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