| 摘要 |
PROBLEM TO BE SOLVED: To provide an expandable polystyrenic resin particle which gives an expanded molded product having excellent crack resistance and retains high expandability over a long period of time by having excellent retainability of a foaming agent, its production method and the expanded molded product. SOLUTION: The expandable resin particle is produced by including a volatile foaming agent into a polystyrenic resin particle obtained through formation of a polystyrenic resin by impregnating a styrenic monomer into a polyolefinic resin particle followed by polymerizing the monomer. Where 140-600 pts.mass of the monomer on the basis of 100 pts.mass of the polyolefinic resin particle, is used; an average thickness of an outer skin layer is 15-150μm and is observed by that after soaking a section obtained by halving the resin particle through the center from the surface of the particle, into tetrahydrofuran and extracting a polystyrenic resin component therefrom, the cross-section of the section is photographed so as to obtain a scanning electron microscope image, followed by observing the image; and 5.5-13.0 mass% of the foaming agent is contained. COPYRIGHT: (C)2008,JPO&INPIT
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