| abstract |
Provided are polypropylene resin foamed particles having a polypropylene-based random copolymer as the base resin. In the polypropylene-based random copolymer, the ratio (Mz/Mn) of the Z-average molecular weight (Mz) and the number average molecular weight (Mn) is from 20 to 300, the melt flow rate is from 5 g/10 min to 20 g/10 min, the melt strength is 2.5 cN or lower, and preferably 1.5 cN or lower, and the flexural modulus is from 600 MPa to 1600 MPa, and preferably 1300 MPa to 1600 MPa. The polypropylene resin foamed particles preferably have at least two heat-of-fusion regions in measurements by differential scanning calorimetry. The molding cycle during in-mold foam molding can be shortened, an in-mold foam molded article such as a returnable container having a beautiful surface can be obtained, and excellent moldability can be obtained even without applying an internal pressure greater than atmospheric pressure or compressing the particles with a gas and filling the mold during in-mold foam molding. |