POLYPROPYLENE-BASED RESIN PARTICLE FOR SEED POLYMERIZATION, PRODUCTION METHOD THEREFOR, COMPOSITE RESIN PARTICLE, FOAMABLE COMPOSITE RESIN PARTICLE, PRELIMINARILY FOAMABLE PARTICLE, AND FOAMED MOLDING

摘要

PROBLEM TO BE SOLVED: To provide polypropylene-based resin particles for seed polymerization, which can give a foamed molding having a high multiple, having black color, excellent in appearance, and having high slow retardancy.

SOLUTION: The polypropylene-based resin particles for seed polymerization is characterized by including 2-10 pts.mass of carbon black in 100 pts.mass of resin particles containing the polypropylene-based resin as a resin component, and having a carbon black dispersion structure having an average area of 1.0×104to 9.9×104nm2in a transmission electron microscope photograph obtained by photographing a 10 μm×10 μm portion of the resin particle surface at a magnification of 2000.

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