| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene resin preliminaryexpanded particle capable of producing an in-mold foaming molded product in a wide range of temperature. SOLUTION: The polypropylene resin preliminary expanded particle has two endothermic peaks on the low temperature side and the high temperature side in a DSC curve found by differential scanning calorimetry carried out while raising temperature from 40-220°C, and a shoulder peak on the high temperature side of the endothermic peak in the DSC curve found by differential scanning calorimetry carried out while raising temperature to 220°C again after lowering it from 220-40°C. The area of the shoulder peak is 0.5% or more of the areas of the endothermic peaks. COPYRIGHT: (C)2009,JPO&INPIT
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