| 摘要 |
PROBLEM TO BE SOLVED: To provide polypropylene-based resin-foamed particles capable of producing a molded article thereof excellent in foamability, molding fusion property and stably expressing an electrostatic diffusion property having the surface resistivity of specific range while maintaining excellent characteristics peculiar to the above resin; and also to provide a molded article of polypropylene-based resin-foamed particles formed through in-mold molding of the particles.SOLUTION: A polypropylene-based resin-foamed particle having electrostatic diffusion property has: a polypropylene-based resin-foamed core layer formed by foaming the composite resin particles in which a polyolefin-based resin-covered layer including a conductive carbon black is covered on a polypropylene-based resin core layer to become an apparent density of 10-120 kg/m; and a polyolefin-based resin-covering layer covering the above foamed core layer. The polyolefin-based resin composing a polyolefin-based resin-covering layer of the foamed particle is the mixture resin of a polypropylene-based resin (A) and a polyethylene-based resin (B), and the reains (A) and (B) form the continuous and dispersing phases, respectively, in the polyolefin-based resin-covering layer. The conductive carbon black is unevenly distributed to a dispersing phase side, and the weight ratio (A:B) of resins (A) and (B) is 99.5:0.5 to 50:50. The blending amount of the carbon black is 5-30 pts.wt. based on 100 pts.wt. of the mixture of resins (A) and (B). |
