Foamed polyolefin resin beads
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[0148](1) Comparative example 1 shows foamed resin beads with an apparent density of 60 kg / cm3 in which the foamed resin beads had a usual single layer structure, a resin 2 (zPP with a melting point of 142° C.) was used as the polyolefin resin constituting foamed resin beads (corresponding to the core layer of the sheath-core structure), and 10% by weight of PEEA was mixed as the antistatic agent. The molded foamed article produced from the foamed resin beads had poor fusion properties and the desired antistatic properties were not obtained, either.
Example
[0149](2) Comparative example 2 shows foamed resin beads in which the blending amount of the antistatic agent was increased to 15% by weight in the foamed resin beads of Comparative example 1. The foamed resin beads were significantly shrunk immediately after foaming and expanding. In the case of the molded foamed article produced by molding in a mold the foamed resin beads at a molding pressure of 0.34 MPa, the desired antistatic performance was obtained. However, fusion properties were significantly reduced. The molding pressure was set to 0.36 MPa in order to improve the fusion properties. However, the molded foamed article was significantly shrunk by excessive heating and a good molded foamed article was not given.
Example
[0150](3) Comparative example 3 shows foamed resin beads in which the polyolefin resin was changed to a resin 1 (mPP with a melting point of 142° C.) and the antistatic agent was changed from PEEA (polyether ester amid type) to PEO (polyolefin-polyethylene oxide block copolymer type) in the foamed resin beads of Comparative example 1. In the case of the molded foamed article obtained from the foamed resin beads, the desired antistatic performance was obtained, however, the fusion properties were still insufficient. As with Comparative example 2, the molded foamed article was significantly shrunk by excessive heating and a good molded foamed article could not be produced when the molding pressure was increased.
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