PROBLEM TO BE SOLVED: To provide an expandable polystyrene-based resin particle for low density expansion molding capable of maintaining high expandability even by a small amount of organic solvent and plasticizer, and a low density polystyrene-based resin expansion molded article.;SOLUTION: The expandable polystyrene-based resin particle includes a copolymer of an acrylate and a styrene-based monomer. The expandable polystyrene-based resin particle for low density expansion molding satisfies the relationship that the absorbance ratio (A) obtained by determining absorbance D1,730 at 1,730 cm-1 and absorbance D1,600 at 1,600 cm-1 of an infrared spectrum obtained by analyzing the surface of the resin particle by ATR infrared spectroscopic analysis and calculated from D1,730/D1,600 and the absorbance ratio (B) obtained by determining the absorbance D1,730 and the absorbance D1,600 by analyzing the central part of the resin particle and calculated from D1,730/D1,600 are (A)(B) and (A) is less than 0.05.;COPYRIGHT: (C)2011,JPO&INPIT
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机译：要解决的问题：提供一种用于低密度膨胀成型的可发泡聚苯乙烯基树脂颗粒，即使在少量有机溶剂和增塑剂的情况下也能保持高膨胀性，以及一种低密度的聚苯乙烯基树脂膨胀模制品。所述可发性聚苯乙烯类树脂颗粒包括丙烯酸酯和苯乙烯类单体的共聚物。用于低密度膨胀成型的可发泡聚苯乙烯基树脂颗粒满足以下关系：通过确定在1,730 cm -1 的吸光度D1,730和在1,600 cm <的吸光度D1,600获得的吸光度比（A）通过ATR红外光谱分析法分析树脂颗粒表面而获得的红外光谱的Sup> -1 ，由D1,730 / D1,600和通过确定吸光度D1获得的吸光度比（B）计算得出， 730和通过分析树脂颗粒的中心部分并根据D1,730 / D1,600计算得出的吸光度D1,600分别为（A）<（B）和（A）小于0.05 .;版权：（C）2011 ，JPO＆INPIT
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