| 摘要 |
PROBLEM TO BE SOLVED: To provide surface-coated aluminum oxide nanoparticles which can be evenly incorporated into a polycarbonate resin in a satisfactorily dispersed state while keeping the molecular weight of the polycarbonate resin on at least a specific level, and a highly transparent polycarbonate resin composition which contains the surface-coated aluminum oxide nanoparticle and is excellent in mechanical strength, dimensional stability and thermal stability. SOLUTION: The surface-coated aluminum oxide nanoparticles have their surfaces coated with a dispersant and a silylating agent. When a sample surface is irradiated with a monochromatized Al-Kαline using an X-ray photoelectron spectroscope to calculate surface element proportions from the areas of the resultant photoelectron peaks, the contents (atm%) of nitrogen atoms, sulfur atoms derived from thiol groups and halogen atoms are each 2 or lower. When surface element proportions are calculated from the areas of the resultant photoelectron peaks attributable to Al2p and Si2s, the concentration of silicon atoms (mol%) is 0.05-30 based on the aluminum atoms. COPYRIGHT: (C)2008,JPO&INPIT
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