| 摘要 |
PROBLEM TO BE SOLVED: To provide expandable polystyrene-based resin beads having excellent self-extiguishability, retaining its expandability, moldability and mechanical strength and needing no complicated treatment process. SOLUTION: The expandable polystyrene-based resin beads impregnated with both foaming agent and flame retardant is such as to be coated with a coating agent consisting of a fatty acid metal salt and/or inorganic particles; wherein the amount of the fatty acid metal salt to be used is <=0.3 pt.wt. based on 100 pts.wt. of the polystyrene-based resin beads, while the amount of the inorganic particles to be used <=0.4 pt.wt.
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