| abstract |
A flat or curved photochromic laminate structure (2) and a plastic photochromic lens blank can be produced in a simple and efficient manner from low-cost polymeric sheet materials. These laminates can be used to provide goggles, face shields, windows, window coverings, skylights and optical lenses having efficient, uniform and high quality photochromic properties. The use of a polyesterurethane as the binder for the photochromic material has been found to improve the performance of the photochromic material. The laminate structure (2) can comprise protective exterior layers (4, 8) on either side of a photochromic layer (6). The laminate (2) can be hard coated on one or both surfaces with an abrasion resistant coating, antireflective coating, and/or an anti-fog hard coating. |