| 摘要 |
PROBLEM TO BE SOLVED: To provide a frozen-stored expandable composite resin particle comprising a polyolefin resin and a polystyrene resin and containing pentane, wherein, even if the expandable composite resin particles are pre-expanded without being thawed after frozen-stored, the pre-expanded particle becomes not in a state having a core, or has a low mixing ratio of the pre-expanded particle in a state having a core. SOLUTION: The wet manufacturing method for the expandable composite resin particles comprises a step of adding pentane as an expanding agent to composite resin particles comprising a polyolefin resin and a polystyrene resin at a temperature within the range of (T+10)°C to (T+40)°C, T(°C) being the boiling point of pentane, in an aqueous medium to impregnate the resin particles with 7.5-11.0 wt.% of pentane, and a step of freezing the pentane-impregnated composite resin particles taken out of the aqueous medium. COPYRIGHT: (C)2011,JPO&INPIT |
