| 摘要 |
<p>Expandable beads comprising as the base resin a propylene random copolymer prepared by copolymerizing propylene with one or more comonomers selected from the group consisting of ethylene and α-olefins having 4 or more carbon atoms in the presence of a metallocene polymerization catalyst, wherein the propylene random copolymer is an isotactic one having a melting point exceeding 140 °C and a melt flow rate of 12 g/10 min or below. For example, propylene/ethylene random copolymers are suitably usable as the base resin. Products of in-mold expansion are produced by packing the expandable beads in a mold and expanding the beads by steam heating to fuse the beads with each other into a cavity-shaped product.</p> |
