| 摘要 |
<p>Disclosed herein is a production process of foamed polymer particles, wherein particles of a polymer, which contain a silica-alumina adsorbent in which the molar ratio of SiO2/Al2O3 is at least 1.15, are dispersed in a dispersion medium in the presence of carbon dioxide in a closed vessel, the resultant dispersion is heated to a temperature not lower than the softening temperature of the polymer to impregnate the polymer particles with carbon dioxide, and the polymer particles and the dispersion medium are then released into an atmosphere of a pressure lower than the internal pressure of the vessel, thereby expanding the polymer particles. The polymer may be an uncrosslinked propylene polymer, uncrosslinked, linear low-density polyethylene or crosslinked polymer.</p> |
