Expandable granulataes based on vinylaromatic polymers...

Details Expandable granulataes based on vinylaromatic polymers... Expandable granulataes based on vinylaromatic polymers...

C - Chemistry, Metallurgy

08

K

C08K 3/04 (2006.01) C08J 9/00 (2006.01) C08J 9/16 (2006.01) C08K 3/30 (2006.01) C08K 3/34 (2006.01) C08L 25/04 (2006.01)

Patent

CA 2625401

Expandable granulates having a composition based on vinylaromatic polymers, essentially consisting of: 65-99.8% by weight of a copolymer obtained by polymerizing 85-100% by weight of one or more vinyl-aromatic monomers having general formula (I) and 0.15% by weight of an alpha-alkylstyrene; 0-25% by weight, calculated with respect to the polymer (a), of carbon black; at least one of the following products: - 0.01-5% by weight of graphite having an average diameter ranging from 0.5 to 50 µm; - 0.01-5% by weight of oxides and/or sulfates and/or lamellar dichalcogenides of metals of groups HA, IHA, HB, IVB or VIIIB, - 0.01-5% by weight of inorganic derivatives of silicon of the lamellar type; 0-5% by weight, calculated with respect to the polymer (a), of a nucleating agent; 1-6% by weight, calculated with respect to the total, of an expanding agent.

Granulés expansibles ayant une composition à base de polymères vinyliques aromatiques, essentiellement constitués de : 65-99,8 % en poids d'un copolymère obtenu en polymérisant 85-100 % en poids d'un ou plusieurs monomères vinyliques aromatiques répondant à la formule générale (I) et 0-15 % en poids d'un alpha-alkylstyrène ; 0-25 % en poids, calculés par rapport au polymère (a), de noir de carbone ; au moins l'un des produits suivants : - 0,01-5 % en poids de graphite ayant un diamètre moyen allant de 0,5 à 50 µm ; - 0,01-5 % en poids d'oxydes et/ou sulfates et/ou dichalcogénures lamellaires de métaux des groupes IIA, IIIA, IIB, IVB ou VIIIB ; - 0,01-5 % en poids de dérivés inorganiques du silicium de type lamellaire ; 0-5 % en poids, calculés par rapport au polymère (a), d'un agent de nucléation ; 1-6 % en poids, calculés par rapport au total, d'un agent d'expansion.

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