| 摘要 |
PROBLEM TO BE SOLVED: To provide a polypropylene-based resin prefoamed particle which can be molded at a low heating molding pressure and which is excellent in surface beauty and size shrinkability since a particle gap at a surface of obtained inmold foamed molding is small. SOLUTION: Dispersed liquid comprising polypropylene-based resin particles, a foaming agent, water, a dispersant and a dispersion assistant is charged in a pressure resistant container, is heated to predetermined temperature and then a mixture in the container is emitted under atmosphere of lower pressure than that in the pressure resistant container to obtain the polypropylene-based resin prefoamed particles. In the polypropylene-based resin prefoamed particle, a polypropylene-based resin composition constituting the polypropylene-based resin particle comprises (A) 100 pts.wt. of polypropylene-based resin having melting point of≤145°C and a melt flow rate of≥2.00 g/10 minute and (B) 1 to 10 pts.wt. of polyolefin oligomer which is obtained by polymerization of ethylene and/or propylene as a main monomer and which has 1,500 to 25,000 molecular weight. COPYRIGHT: (C)2009,JPO&INPIT
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