| 摘要 |
<p>Pre-expanded polypropylene resin beads which are more reduced in cell diameter fluctuation and expansion ratio fluctuation than conventional ones. The pre-expanded beads are obtained from: a polypropylene resin composition, as a base resin, which comprises (A) a polypropylene resin and (B) a compound having a triazine skeleton and having a molecular weight of 300 or lower per unit triazine skeleton and may contain as optional ingredients (C) a hydrophilic polymer and (D) an inorganic filler; and water as a blowing agent. Use of the pre-expanded beads in in-mold foaming gives polypropylene resin moldings reduced in color unevenness and weight unevenness.</p> |
