abstract |
[PROBLEMS] To provide a methacrylic resin composition that has practically sufficient optical properties, is excellent in heat resistance, heat and humidity resistance, thermal stability, and molding processability, and has a sufficiently high mechanical strength. A methacrylic acid ester monomer unit (A): 50 to 99.9% by mass, a structural unit (B) having a ring structure in the main chain: 0.1 to 30% by mass, and a methacrylic acid ester unit 100 parts by weight of methacrylic resin (I) containing 0 to 20% by mass of other vinyl monomer units (C) that can be copolymerized into a monomer and satisfying the following condition (i); One or more compounds selected from glycerin fatty acid esters, sorbitan fatty acid esters, polyether compounds, fatty acid metal salts, trimellitic acid esters and pyromellitic acid esters (D) 0.001 to 1 mass And A methacrylic resin composition containing: Condition (i) The weight average molecular weight measured by gel permeation chromatography (GPC) is 650,000 to 300,000. [Selection figure] None |