| 摘要 |
PURPOSE:To obtain the title resin being a copolymer consisting of a specific ratio of methyl methacrylate unit, bromophenyl methacrylate unit, etc., having intrinsic viscosity being in a specific range, having excellent optical properties and heat resistance and free from problems such as stain of mold and bleeding. CONSTITUTION:The objective resin being a copolymer consisting of 55-85wt.%, preferably 60-80wt.% methyl methacrylate unit, 15-35wt.%, preferably 20-30wt.% bromophenyl methacrylate unit expressed by the formula (i is 3-5) and 0-10wt.%, preferably 2-8wt.% polymerizable other vinyl compound unit (e.g. ethyl methacrylate), being 0.35-0.60dl/g, preferably 0.40-0.55dl/g in intrinsic viscosity measured at 20 deg.C in chloroform. |
