Lens with photochromic elastomer film and method of making it
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United States of America Patent
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Aug 10, 2004
Grant Date -
Sep 26, 2002
app pub date -
Mar 21, 2001
filing date -
Mar 21, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A photochromic lens consists of a lens coated with an elastomeric film having a photochromic dye dispersed therein. The elastomeric provides abrasion resistance and some impact resistance to the lens. The photochromic lens is characterized by lower spectral transmission when activated, and shorter activation and deactivation times than previously known photochromic lenses. A method for making the photochromic lens consists of dissolving one or more photochromic dyes in an elastomeric pre-polymer solution, immersing the lens in the solution so that the lens becomes coated with the prepolymer solution, and treating the lens, for example, by heating, to cause said prepolymer to form an elastomeric film on the lens. Preferably, the pre-polymer solution is a polyurethane pre-polymer.
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