PRECURSOR SOL OF ALUMINUM OXIDE AND METHOD FOR PRODUCING OPTICAL MEMBER

摘要

A precursor sol (2) of aluminum oxide includes a solvent and particles containing a hydrolysate of an aluminum compound and/or a condensate of the hydrolysate, in which the particles have an average particle size of 2.5 nm to 7 nm. A method for producing an optical member includes the steps of feeding the precursor sol (2) of aluminum oxide described above onto a base (1) to form an aluminum oxide film (3) and immersing the aluminum oxide film (3) in hot water with a temperature of 60°C to 100°C to form a textured structure (5) comprising aluminum oxide boehmite.