Surface-coated aluminum oxide nanoparticles capable of being uniformly blended into polycarbonate resin in a good dispersed state while maintaining a molecular weight of the polycarbonate resin at a specific level or more. Surfaces of the surface-coated aluminum oxide nanoparticles are coated with a dispersant and a silylation reagent. In a case where a monochromated Al-Ka ray is irradiated onto a sample surface by using an X-ray photoelectron spectroscope, when a surface element composition is calculated from an obtained photoelectron peak area, contents (atm%) of nitrogen atoms, thiol-derived sulfur atoms, and halogen atoms in the surface-coated aluminum oxide nanoparticles are individually 2 or less, and when the surface element composition is calculated from obtained photoelectron peak areas of Al2p and Si2s, a concentration (mol%) of silicon atoms with respect to aluminum atoms is 0.05 to 30.
                            表面涂层的
纳米氧化铝颗粒能够以良好的分散状态均匀地混合到聚
碳酸酯
树脂中,同时将聚
碳酸酯
树脂的分子量保持在特定
水平或更高。表面涂层
纳米氧化铝颗粒的表面涂有分散剂和
硅烷化试剂。在使用 X 射线光电子能谱仪将单色 Al-Ka 射线照射到样品表面的情况下,根据获得的光电子峰面积计算表面元素组成时,表面中氮原子、
硫醇衍生的
硫原子和卤素原子的含量(atm%)、当根据所获得的 Al2p 和 Si2s 的光电子峰面积计算表面元素组成时,表面包覆的氧化铝纳米颗粒中的氮原子、
硫醇衍生的
硫原子和卤素原子的含量(atm%)单独为 2 或更少;当根据所获得的 Al2p 和 Si2s 的光电子峰面积计算表面元素组成时,
硅原子相对于铝原子的浓度(mol%)为 0.05 至 30。