Patent ID: 8293438
Filing Date: 2012-10-23
Classification: G03C

Abstract:
1. A photochromic composite comprising: a photochromic polymer comprising a photochromic moiety covalently bound to a backbone portion, wherein the photochromic polymer has a glass transition temperature ranging from about 30° C. to about 150° C.; and a polymer binder, wherein the polymer binder and the backbone portion of the photochromic polymer are similar type polymers, and wherein the polymer binder and the backbone portion each comprises at least one similar functional group, wherein the backbone portion is prepared by polymerizing a monomer mixture, the monomer mixture comprising (a) a first monomer selected from the group consisting of terephthalic acid, dimethyl terephthalate, terephthaloyl chloride, isophthalic acid, dimethyl isophthalate, isophthaloyl chloride, phthalic acid, dimethyl phthalate, phthaloyl chloride, and mixtures thereof, and (b) a second monomer selected from the group consisting of ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol, heptylene glycol, diethylene glycol, dipropylene glycol, cyclohexyldimethanol, and mixtures thereof.