EXPANDED MODIFIED PROPYLENE RESIN PARTICLE

摘要

PROBLEM TO BE SOLVED: To provide expanded modified propylene resin particles which require a markedly shortened water cooling time in in-mold molding. SOLUTION: These particles are uncrosslinked ones based on a modified polypropylene resin obtained by impregnating polypropylene resin particles with a vinyl monomer and grafting the monomer onto the particles and having a ratio of the polypropylene resin content to the content of the polymer comprising the vinyl monomer of (97-65)/(3-35) by weight and having a bulk density of 0.045 g/cm<3> or below and a mean cell diameter of 200μm or above.