POLYPROPYLENE RESIN PRE-EXPANDED PARTICLES AND IN-MOLD FOAMED ARTICLES PREPARED THEREFROM

摘要

An object of the present invention is to provide an in-mold foamed article having good surface appearances and high rigidity produced by using a common molding machine that withstands a pressure of up to 0.4 MPa. The present invention provides polypropylene resin pre-expanded particles containing a base resin which is a resin having a melt flow rate of 5 g/10 min or more and 20 g/10 min or less and a melting point of 140°C or higher and 155°C or lower and satisfying the conditional formula below, and an in-mold foamed article produced from molding the pre-expanded particles: Heat of crystal fusion J / g ‰¥ 1.2 × Melting point °C - 96