| 摘要 |
PROBLEM TO BE SOLVED: To provide a polystyrene resin composition with low water absorption, excellent in suppressing warpage or a dimensional change in a molded article, and excellent in optical characteristics, and to provide a light guide plate obtained by molding the polystyrene resin composition.SOLUTION: The polystyrene resin composition comprises a polystyrene resin, a phosphorus-based antioxidant, a phenol-based antioxidant and 4-t-butylcatechol. The content of the phosphorus-based antioxidant is 0.02 parts by mass to 0.2 parts by mass with respect to 100 parts by mass of the polystyrene resin; the content of the phenol-based antioxidant is 0.02 parts by mass to 0.2 parts by mass with respect to 100 parts by mass of the polystyrene resin; the content of the 4-t-butylcatechol is 1 μg to 6 μg per 1 g of the polystyrene resin composition. |
