| 摘要 |
The present invention addresses the problem of providing a transparent styrene-based optical resin composition that minimizes a shortcoming of styrene-based resins, namely that environmental changes such as changes in temperature or humidity, or immersion in water cause the clouding (bleaching) of molded products thereof. The present invention provides a styrene-based optical resin composition that contains a styrene-based resin having a weight-average molecular weight of 150,000-700,000 and a hydrophilic additive, and is characterized in that the hydrophilic additive: is at least one substance selected from among polyoxyethylene surfactants having an average added mole number of ethylene oxide of 3-150 and/or polyethylene glycols having an average molecular weight of 200-10,000; has an HLB value of 5-20; and composes 0.4-2.0 mass% of the 100 mass% of the styrene-based resin composition. |
