| 摘要 |
PURPOSE:To obtain an optical disk having low birefringence and moisture absorption, high transparency, etc., and faint color, by using a resin produced by adding a specific amount of antioxidant to a copolymer containing cyclohexyl methacrylate, a styrene (derivative), etc., as essential components. CONSTITUTION:(A) A copolymer composed essentially of (A1) 40-80(wt)% cyclohexyl methacrylate, (A2) 10-60%, preferably 30-50% styrene and/or styrene derivative and (A3) 0.5-10% acrylic acid ester (e.g. methyl acrylate, ethyl acrylate, etc.) is compounded with (B) 0.01-1.5%, preferably 0.02-0.5% antioxidant (phenolic antioxidant), and the obtained resin is molded by injection molding or compression molding. |
