It is low, the foaming Characteristic polystyrene type resin grain and the production manner for density foaming, low the density polystyrene type resin preexpansion grain and it is low being the foaming Characteristic polystyrene type resin grain which

摘要

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