Anti-fogging coating and optical part using the same

摘要

Disclosed herein is an anti-fogging coating formed on the surface of an optical substrate (1), wherein the anti-fogging coating comprises a water-absorbing film (2) and a porous film (3) in the order near to the surface of the substrate. The porous film is an inorganic oxide formed by vacuum deposition. It protects the water-absorbing film from abrasion and allows water to reach the water-absorbing film. The coating has anti-reflecting properties. The water-absorbing film is obtained by polycondensation of a hydrolyzate of an inorganic alkoxide in the presence of a polyacrylic acid compound.