Abstract: This document discloses a clear, polymeric composition that provides both abrasion resistance and non-fogging properties. The composition may be applied to plastic or glass with or without the use of a solvent carrier, or may be cast into a molded article. The fully cured composition provides a fog-free surface that repels condensation while the interior of the polymeric deposition provides a hydrophilic environment for the absorption of water vapor. This combination of properties is highly efficacious and permanent, functioning independent of any additional non-fogging additives. The current invention is composed of an isocyanate prepolymer and a water-soluble polyhydroxl polymer. An absence or surfactants or crosslinking additives/chain extenders makes the current invention innovative amongst prior art, relying totally upon the inventors' use of certain unique material combinations.

Abstract: A method and apparatus for the stabilizing of napthopyran and spiroxazine photochromic dye in a coating or plastic media is presented. As prolonged exposure to light causes degradation of the photochromic properties of the dyes, a two-tiered layering system is utilized in which a hindered amine stabilizer (HALS) and/or an ultraviolet light (UV) absorber, is placed as a clear coat layer above a bottom layer containing the photochromic dyes. The bottom layer is constructed containing the photochromic dyes by either a coating of a surface of a lens or an imbuing of the photochromic dyes into the lens material, and can further optionally contain a HALS and/or UV blocking compound itself.