| 摘要 |
PROBLEM TO BE SOLVED: To provide polypropylene resin foamed particles having good secondary foamability and excellent fusibility of particles, having a shortened thermoforming cycle and a shortened curing time, and giving foamed molding of improved cracking resistance. SOLUTION: There are provided polypropylene resin foamed particles made from a base resin being a propylene random copolymer or a random block copolymer and have a melt flow rate index of 0.5-6 g/10 min, a Z-average molecular weight of 1.2×106 or above (in terms of the polystyrene), and a melting point of 130 deg.C or above, and give a DSC curve (one obtained when 1-3 mg of the foamed particles are heated from room temperature to 200 deg.C at a rate of temperature rise of 10 deg.C/min on a differential scanning colorimeter) in which at least two endothermic peaks appear, and the absorbed thermal energy of the endothermic peak, among the peaks, appearing at a temperature on the side nearer to the high temperature side than the intrinsic peak is 1-20 J/g. |
