Dispersion liquid of core-shell type composite oxide fine particles, process for producing the dispersion liquid, and coating composition containing the fine particles

摘要

Core-shell type composite oxide fine particles are described in which the core particles are oxide fine particles or composite oxide fine particles that do not contain silicon and/or aluminum as main components, and the surface of the core particles is covered with a shell including a composite oxide that contains silicon and aluminum as main components, the shell containing silicon and aluminum in a weight ratio in terms of oxides, SiO2/Al2O3, in the range of 2.0 to 30.0. A dispersion liquid of the core-shell type composite oxide fine particles exhibits very high stability.

主权项

1. A dispersion liquid of core-shell type composite oxide fine particles comprising core-shell type composite oxide fine particles which comprises a core particle and shell and in which the surface of the core particle is covered with the shell, the core particle comprises an oxide fine particle or a composite oxide fine particle that does not contain silicon and/or aluminum as main component, and the shell comprises a composite oxide containing silicon and aluminum as main components and the shell comprises the silicon and aluminum in a weight ratio in terms of oxides, SiO2/Al2O3, in the range of 6.4 to 30.0, wherein the core-shell type composite oxide fine particles have a surface negative charge per unit surface area in the range of 0.5 to 1.5 μeq/m2 as measured at pH 6.