| 摘要 |
PROBLEM TO BE SOLVED: To provide a styrene-based resin composition that prevents thermal discoloration in a high-temperature heat history in molding and processing, etc., is especially suitable for optical uses of light guide plate, etc., and has excellent colorless transparency.SOLUTION: The styrene-based resin composition includes (1) a styrene-based resin having a weight-average molecular weight of 150,000-700,000, a cyclic phosphite compound of a specific structure and a hindered phenol-based antioxidant (wherein the content of the phosphite compound of a specific structure is 0.08-0.40 mass%). |
