Patent ID: 9449735
Filing Date: 2016-09-20
CPC Classification: C08J,H01B

Claim Text:
1. A polyolefin-based resin expanded beads molded article obtained by in-mold molding of multi-layered polyolefin-based resin expanded beads each having an polyolefin-based resin expanded core layer and a polyolefin-based resin cover layer covering the polyolefin-based resin expanded core layer, wherein the polyolefin-based resin cover layer comprises a mixture of a polyolefin-based resin (A), a polymeric antistatic agent (B) which is a block copolymer of a polyether block and a polyolefin block, and an electrically conductive carbon black (C), wherein a weight ratio (A:B) of the polyolefin-based resin (A) to the polymeric antistatic agent (B) is 99.5:0.5 to 55:45, and the electrically conductive carbon black (C) is present in an amount of 5 to 30 parts by weight per 100 parts by weight of the total of the polyolefin-based resin (A) and the polymeric antistatic agent (B), wherein the cover layer has a structure in which the polyolefin-based resin (A) forms a continuous phase and the polymeric antistatic agent (B) forms dispersed phases that are dispersed in the continuous phase with the electrically conductive carbon black (C) being unevenly distributed to the dispersed phases, and wherein the polyolefin-based resin expanded beads molded article has a surface resistivity of 1×10