IMPROVED EXPANDABLE VINYL AROMATIC POLYMERS

• Main Authors: MICHEL, Jacques, IACOLINA, Amelio, CASSART, Michel, DELEYE, Jean-Claude, VACHAUDEZ, Magali, URBANCZYK, Laetitia
• Format: Patent
• Language: English; French
• Published: 19.04.2018
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

The present invention is related to expandable vinyl aromatic polymers comprising comminuted coke, said comminuted coke having an average stack height (Lc) of carbon crystallites at least 4 nm, a volume median particle diameter (D50) comprised between 1 and less than 5 µm and being characterized by a span (D90 - D10)/D50 below 2.5 Molded parts produced from the expandable vinyl aromatic polymers prove low thermal conductivities for a low foam density. La présente invention concerne des polymères aromatiques de vinyle expansibles comprenant du coke broyé, ledit coke broyé ayant une hauteur moyenne d'empilement (Lc) de cristallites de carbone d'au moins 4 nm, un diamètre médian de particule en volume (D50) compris entre 1 et moins de 5 µm et est caractérisé par un span (D90-D10)/D50 inférieur à 2,5. Les pièces moulées produites à partir des polymères aromatiques de vinyle expansibles selon l'invention présentent de faibles conductivités thermiques pour une mousse basse densité.