| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a binder capable of coating a metal oxide sol without requiring specific treating facilities, in forming a film for sufficiently exhibiting optical functions of a metal oxide sol selected from titanium, cerium, niobium and tantalum with respect to a binder for the metal oxide sol. SOLUTION: Since this binder for a metal oxide sol is selected from titanium, cerium, niobium and tantalum, comprising a basic alkali metal stannate having a composition in a range of M/Sn (M is an alkali metal) of 0.05-0.5 (molar ratio), in forming a film for sufficiently exhibiting optical functions of a metal oxide sol, the metal oxide sol can be coated with requiring specific treating facilities.</p> |
