Importance

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Abstract

A two-layer antireflective coating composition stacked on a substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass and comprising a bottom layer containing less than 10% by weight of titanium dioxide equivalent weight and a titanium-free top layer containing polysiloxane resin; and a process for preparing said antireflective coating with improved adhesion on a substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass. The thicknesses of each of said coating layers is in accordance with preselected equations, and the refractive indices of a said coating layers satisfy the following requirements: n.sub.s n.sub.t wherein n.sub.s represents the refractive index of the substrate consisting of allyl diglycol carbonate polymer (CR-39) or glass, n.sub.b represents the refractive index of the bottom layer, and n.sub.t represents the refractive index of the top layer.

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First Claim