| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing preliminarily foamed particles of a polyolefin-based resin, which are stably dispersed in a dispersion medium and characterized in that a dispersing agent sticking on the surface of each particle does not inhibit mutual fusion during molding and does not contaminate or corrode a mold. SOLUTION: In the method for producing the preliminarily foamed particles of a polyolefin-based resin, comprising charging a dispersion containing polyolefin-based resin particles, water, a dispersing agent and a dispersing aid, and a foaming agent into a pressure-resistant container, then heating the inside of the pressure-resistant container to a prescribed temperature under pressure, and releasing the dispersion into an atmosphere having pressure lower than that in the pressure-resistant container while keeping the temperature and pressure constant, the dispersing agent is an inorganic sulfate and the dispersing aid is an anionic surfactant having a 10-18C straight carbon chain as a hydrophobic group. COPYRIGHT: (C)2009,JPO&INPIT
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