| 摘要 |
These foamed polypropylene-resin particles are obtained as follows: inside a pressure-resistant vessel, polypropylene-resin particles containing polyethylene glycol and/or glycerin are dispersed in an aqueous dispersion medium; carbon-dioxide gas is introduced into said pressure-resistant vessel as a blowing agent; the polypropylene-resin particles are impregnated with said blowing agent under heat and pressure; and the polypropylene-resin particles are then foamed by being discharged into a pressure region that is at a lower pressure than the interior of the pressure-resistant vessel and is at a temperature that is greater than 80°C but no greater than 110°C. This makes it possible to provide foamed polypropylene-resin particles that: can produce a foamed-in-place molded body using a low molding heated-steam pressure; do not lose moldability even if a high molding heated-steam pressure is used; have a wide molding heated-steam range; exhibit good moldability even when a complicatedly shaped mold, a large mold, or the like is used; and do not decrease much in terms of physical properties such as compressive strength when made into a foamed-in-place molded body. |
