| abstract |
Disclosed is a high-refractive-index metal oxide composite colloidal particle sol containing titanium oxide, in which discoloration of colloidal particles due to photoexcitation is almost completely suppressed and excellent in light resistance and weather resistance. It has a primary particle size of 2 to 50 nm, a SnO 2 / TiO 2 molar ratio of 0.1 to 1.0, a ZrO 2 / TiO 2 molar ratio of 0.1 to 0.4, and WO 3 This is based on titanium oxide-tin oxide-zirconium oxide-tungsten oxide composite colloidal particles having a / TiO 2 molar ratio of 0.03 to 0.15. [Selection figure] None |