PROBLEM TO BE SOLVED: To obtain foamable styrene resin particles which can be foamed to a foaming ratio of 80 or higher, pref. 100 or higher, and can produce a soft molded foam having a still higher foaming ratio and exhibiting, when fusion cut, a good cut surface while hardly allowing a threadlike resin to appear at the surface. ;SOLUTION: This foamable styrene resin particle mainly comprises a styrene resin having a wt. average mol.wt. of 200,000-300,000, contains 2-8wt.% (based on the resin) isobutane as a blowing agent, and contains 0.5-3wt.% (based on the resin) plasticizer which is liq. at normal temp. and boils at 200°C or higher.;COPYRIGHT: (C)1997,JPO
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