| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing rutile type titanium oxide fine particles having high purity and a high refractive index without using a tin compound or without firing at a high temperature. SOLUTION: The method for producing rutile type titanium oxide fine particles includes steps of: (a) mixing and reacting titanium alkoxide and hydrogen peroxide in a 2 to 50 molar ratio (M<SB>HP</SB>)/(M<SB>Ti</SB>) of the molar number of hydrogen peroxide (M<SB>HP</SB>, in terms of H<SB>2</SB>O<SB>2</SB>) to the molar number of titanium alkoxide (M<SB>Ti</SB>, in terms of TiO<SB>2</SB>); and (c) subjecting the mixture to hydrothermal treatment at 100 to 350°C, wherein the method includes a step of (b) ageing the mixture at 50 to 100°C, subsequent to the step (a). The obtained rutile type titanium oxide fine particles have an average particle width (W) ranging from 2 to 50 nm, an average length (L) ranging from 2 to 500 nm and an aspect ratio (W)/(L) ranging from 1 to 10. COPYRIGHT: (C)2009,JPO&INPIT
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