FOAMABLE POLYSTYRENE-BASED RESIN PARTICLES AND METHOD FOR PRODUCING THE SAME, POLYSTYRENE-BASED RESIN PREFOAMED PARTICLES, AND POLYSTYRENE-BASED RESIN FOAMED MOLDING

摘要

PROBLEM TO BE SOLVED: To provide foamable polystyrene-based resin particles which can give foamed moldings having high expansion ratios and excellent in mechanical strengths, to provide a method for producing the same, to provide polystyrene-based resin prefoamed particles, and to provide a polystyrene-based resin foamed molding.;SOLUTION: Foamable polystyrene-based resin particles prepared by granulating a polystyrene-based resin containing a foaming agent is characterized in that the weight-average mol.wt. Mw of the polystyrene-based resin is within 120,000-320,000; the foaming agent contains pentane and butane in an amount of 2-10 pts.mass per 100 pts.mass of the polystyrene-based resin as essential components; and the composition of the foaming agent has a mass ratio within pentane:butane=20:80-80:20.;COPYRIGHT: (C)2013,JPO&INPIT