Patents Assigned to Signet Armorlite
  • Polyurethane-based photochromic optical materials
    Patent number: 8633292
    Abstract: A photochromic composition for making optical materials comprising a polyurethane prepolymer formed by combining an isocyanate and a compound having an active hydrogen containing group, a polysilsequioxane and a photochromic compound. The photochromic composition may also include a monomer that has both an active hydrogen containing group and an unsaturated group. The polysilsesquioxane is incorporated as a copolymer and/or as a polysilsequioxane-chemically modified polyurethane.
    Type: Grant
    Filed: March 26, 2009
    Date of Patent: January 21, 2014
    Assignee: Signet Armorlite
    Inventors: Geoffrey Yuxin Hu, Thomas J. Engardio