Resources Contact Us Home
Photochromic articles with reduced temperature dependency and methods for preparation

Image Number 2 for United States Patent #7320826.

Described are photochromic articles that include a substrate, a temperature dependent reducing amount of at least one organic photochromic material (b) that changes from more absorbing to less absorbing of radiation in its activating spectral absorbance as the temperature increases from C. to C. and at least one other photochromic material (c) that is different from photochromic material (b). In the article, photochromic material (b) is interposed between photochromic material (c) and a source of activating radiation. The photochromic article demonstrates a more consistent photochromic response, for example, an optical density response loss of 50 percent or less over a temperature range of from C. to C. as measured in the Photochromic Temperature Dependence Test. Methods for producing the aforedescribed articles are also disclosed.

  Recently Added Patents
AIN buffer N-polar GaN HEMT profile
Linerless labels
Process for brominating unsaturated organic compounds with removal of quaternary ammonium or quaternary phosphonium monochlorides
Adaptive non-positive inductor current detector (ANPICD)
Reception method and reception apparatus
Image signal processing apparatus and image signal processing method
  Randomly Featured Patents
Read-out method and apparatus
Apparatus having an electrical machine
Audio video shelving unit
Printing members for direct imaging and methods of producing same
Process for preparing curable compounds
Watch case
Waste basket liner system
Ice nucleation active microorganism
Method for diagnosing acute lymphomic leukemia (ALL) using miR-146a
Method for producing conductor bars and stator winding for an electric machine