| 摘要 |
PROBLEM TO BE SOLVED: To reduce resin particles remaining in a pressure-resistant container after releasing and to efficiently produce especially polyolefin-based resin pre-foamed particles having antistatic characteristic, in a method for producing the polyolefin-based resin pre-foamed particles, comprising releasing an aqueous dispersion containing polyolefin-based resin particles from a pressure-resistant container. SOLUTION: This method for producing polyolefin-based resin pre-foamed particles comprises the steps of: charging polyolefin-based resin particles containing a specified hydroxyalkyl monoethanolamine in an amount of 0.05-5 parts by weight to 100 parts by weight of a polyolefin-based resin together with an aqueous dispersion medium having a pH of 2-6, calcium phosphate as a dispersant, and a foaming agent in a pressure-resistant container to obtains an aqueous dispersion; incorporating the foaming agent into each polyolefin-based resin particle by pressurizing the dispersion in a temperature range of -20 to +20°C with respect to the melting point of the polyolefin-based resin particles, and releasing the aqueous dispersion under an atmosphere having pressure lower than that in the pressure-resistant container. COPYRIGHT: (C)2009,JPO&INPIT
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