Patent ID: 6399682
Filing Date: 2002-06-04
Classification: C08F,C08K,G02B

Abstract:
A photochromic transparent organic material comprising:an optical quality polymer matrix comprising a polymer selected from the group consisting of (a) homopolymers of ethoxylated bisphenol A dimethacrylate having the following formula (I): in which R is H or CH3 and m and n independently represent 1 or 2, and (b) copolymers comprising ethoxylated bisphenol A dimethacrylate containing, at most, 30 weight percent of an aromatic monomer bearing vinyl, acrylic, or methacrylic functionality; andat least one coloring agent selected from the group consisting of spiroxazines, spiropyrans, and chromenes; wherein said at least one coloring agent is substantially uniformly distributed in said polymer matrix.