STYRENE RESIN COMPOSITION, BIAXIALLY STRETCHED STYRENE RESIN SHEET, AND MOLDED ARTICLE OF THE STYRENE RESIN COMPOSITION OR THE BIAXIALLY STRETCHED STYRENE RESIN SHEET

摘要

Disclosed is a styrene resin composition which is capable of improving moldability in various molding methods, while maintaining the practical strength of a molded article which is obtained using a styrene-acrylic resin composition. The styrene resin composition is obtained by copolymerizing a hyperbranched macromonomer, a styrene monomer and an acrylate ester at a specific ratio, and has a specific weight average molecular weight and a specific molecular weight distribution. Also disclosed is a biaxially stretched styrene resin sheet using the styrene resin composition, which has excellent optical characteristics. The styrene resin sheet exhibits sufficient reproducibility of a mold shape and punchability of a molded article in a radiation heating vacuum pressure molding method, and is capable of providing a good molded article that is free from thickness unevenness. In addition, the styrene resin sheet is capable of having a heating time of one second or more, and exhibits excellent productivity during the secondary processing.