Eps particles comprising aluminum platelets and method for...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/00 (2006.01) C08J 9/14 (2006.01) C08J 9/16 (2006.01) C08J 9/20 (2006.01) C08K 3/08 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2360527

This invention relates to expandable polystyrene (EPS) particles with thermal insulation properties. Disclosed are EPS particles capable of being processed into hard foamed plastic material having a fine cell structure and a low density, the EPS particles comprising at least one foaming agent, and, homogeneously distributed throughout the particles, aluminum particles which provide infrared or thermal insulation, wherein the main proportion of the aluminum particles are present as platelets having a largest dimension between 1 and 15 µm. Also disclosed are methods for producing such EPS particles. The disclosed EPS particles are useful as heat insulation plastics, e.g. for the facade walls of buildings, or for cold storage or packing materials.

L'invention concerne des polymères de styrène particulaires, expansibles, qui peuvent être transformés en mousses rigides de faible densité et contiennent à cet effet un agent d'expansion. Ces polymères contiennent au moins de l'aluminium sous forme particulaire qui sert à améliorer leur propriétés d'isolation thermique. Les particules de polymères de styrène présentent, après expansion, une structure cellulaire fine. Les particules d'aluminium sont incorporées en étant réparties de manière homogène, en tant que matériau réfléchissant les rayons infrarouges. La majeure partie de ces particules d'aluminium se présente sous la forme de particules présentant des dimensions comprises entre 1 et 15 mu m. Les particules de polymères de styrène ainsi obtenues peuvent être expansées pour former des mousses de particules de polystyrène qui présentent une masse volumique maximale de 30 g/l et des propriétés d'isolation thermique améliorées.

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