| 摘要 |
PURPOSE:To obtain resin particles which do not adhere to one another during pre-expanding and in which pre-expanded particles are fused to one another during molding, by coating or impregnating expandable polystyrene resin particles with hydrogenated hardened rice bran oil. CONSTITUTION:Resin particles are obtd. by coating or impregnating expandable polystyrene resin particles with hydrogenated hardened rice bran oil. The amount of the oil is 0.01-2.00wt% based on that of the resin particle. When the amount is less than 0.01wt%, no sufficient effect can be obtd. The amount exceeding 2wt% gives no increased benefits and a large quantity thereof has an adverse effect. Since the hydrogenated hardened rice bran oil is a long-chain substance having a large MW, it easily forms a film on the surfaces of the expandable polystyrene resin particles. Thus even when it is added during the course of the impregnation with a blowing agent or a polymn. reaction, an effect can be obtd., because the oil is liable to exist on the surfaces of the particles or in the vicinity of the surfaces thereof.
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