| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing efficiently a silica aerogel film having a low refractive index and excellent scratch resistance, an anti-reflection coating formed by such silica aerogel, and an optical element having such anti-reflection coating. <P>SOLUTION: A method for producing a silica aerogel film includes processes to prepare an alkaline sol by hydrolyzing and polymerizing alkoxysilane in the presence of a base catalyst, adding an acid catalyst to the alkaline sol to carry out further hydrolysis and polymerization to prepare a first acidic sol, hydrolyzing and polymerizing alkoxysilane in the presence of an acid catalyst to prepare a second acidic sol, applying a mixture of the first and second acidic sols to a substrate, and drying it. <P>COPYRIGHT: (C)2009,JPO&INPIT |
