FOAMABLE POLYSTYRENE RESIN PARTICLES FOR PRODUCTION OF BANKING MEMBER AND PROCESS FOR PRODUCTION THEREOF, PREFOAMED PARTICLES FOR PRODUCTION OF BANKING MEMBER, AND BANKING MEMBER

摘要

PROBLEM TO BE SOLVED: To provide a banking member having satisfactory flame retardant performance and excellent mechanical strength and dimensional stability with a flame retardant agent that is highly safe for environments and organisms.;SOLUTION: Foamable polystyrene resin particles for the production of a banking member are obtained by a melt extrusion method in which a flame retardant agent and a foaming agent are added to a polystyrene resin in a resin feed unit and kneaded, the resulting molten resin containing the flame retardant agent and foaming agent is directly extruded into a cooling liquid from small holes in a die attached to the leading end of the resin feed unit, and simultaneously with the extrusion, the extrudates are cut and solidified by cooling by contact with the liquid to obtain foamable polystyrene resin particles, wherein the flame retardant agent contains a bromine atom in the molecule, has a bromine-containing component content of 70 mass%, has a benzene ring in the molecule, and has a 5 mass% decomposition temperature of 200-300°C.;COPYRIGHT: (C)2011,JPO&INPIT