Optical element having antireflection film

#The present invention relates to an optical element having an antireflection film. It relates to an optical element having an antireflection film that has excellent adhesiveness between a plastic substrate and the antireflection film, abrasion resistance, heat resistance, alkali resistance and impact resistance.

#Heretofore known are optical elements having an antireflection film provided on a plastic substrate. Also known are optical elements having a thin metal film layer provided on the surface of a plastic substrate for enhancing the adhesiveness between the plastic substrate and the antireflection film. For example, Japanese Patent Laid-Open No. 186202/1987 discloses an antireflection film for an optical element having a thin metal film layer provided on the surface of a plastic substrate, in which the metal layer is made of a metal selected from the group consisting of copper (Cu), aluminum (Al), nickel (Ni), gold (Au), chromium (Cr), palladium (Pd) and tin (Sn).

#However, these optical elements having an antireflection film are unsatisfactory with respect to their heat resistance and impact resistance. Therefore, it is desirable to provide optical elements having an antireflection film that have improved physical properties such as heat resistance, abrasion resistance, alkali resistance and impact resistance.

#The invention is described in more detail with reference to the following Examples, which, however, are not intended to restrict the scope of the invention.

#The physical properties of the optical elements obtained in the following Examples and Comparative Examples were evaluated according to the methods mentioned below.

#(1) Luminous Transmittance: