| 摘要 |
Improved polypropylene resin foam particles that without detriment to the excellence in properties, such as compression properties and heat resistance, characterizing the polypropylene resin foam particles, can provide a polypropylene resin foam particle molded article with equal properties by an in-mold forming conducted at low heating temperature. There are disclosed polypropylene resin foam particles consisting of a polypropylene resin of 115° to 135°C resin melting point and 500 MPa or higher Olsen flexural modulus. The amount of ash at the surface of the foam particles is 3000 wt.ppm or less (including 0). With respect to the foam particles, in the first DSC curve obtained by heating 1 to 3 mg of polypropylene resin foam particles from room temperature to 200°C at a temperature elevation rate of 10°C/min by the use of a differential scanning calorimeter, there appear not only one or more endothermic peak (Pa) having the peak temperature within a temperature zone not higher than the melting point of the resin but also one or more endothermic peak (Pb) having the peak temperature within a temperature zone exceeding the melting point of the resin and not lower than 130°C. The total calorific value of the endothermic peak (Pb) is in the range of 2 to 12 J/g. Further, there is disclosed a foam particle molded article obtained by molding the above foam particles.
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