PROCESS FOR THE PREPARATION OF EXPANDABLE VINYL AROMATIC POLYMER PARTICLES CONTAINING HEXABROMOCYCLODODECANE

• Main Authors: DENNIS M. HAJNIK, FRED M. SONNENBERG
• Format: Patent
• Language: English
• Published: 30.04.1999
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WORKING-UP

FIRE-RETARDANT EXPANDABLE VINYL AROMATIC POLYMER BEADS ARE PREPARED BY AN AQUEOUS SUSPENSION METHOD WHEREBY MICRONIZED HEXABROMOCYCLODODECANE AND A VOLATILE ALIPHATIC HYDROCARBON FOAMING AGENT ARE INCORPORATED INTO PARTICLES OF A THERMOPLASTIC SUCH AS POLYSTYRENE. THE BEADS ARE USEFUL IN THE PREPARATION OF MOLDED FOAM ARTICLES HAVING EXCELLENT RESISTANCE TO FLAME.