Patent ID: 8216765
Filing Date: 2012-07-10
Classification: G03C

Abstract:
1. A reusable and reimageable medium comprising: a substrate; and an imaging layer coated on or impregnated into said substrate, wherein the imaging layer comprises a photochromic polymer, wherein the photochromic polymer 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, terphthalovl 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, cyclohexydimethanol, and mixtures thereof, wherein the photochromic polymer has a glass transition temperature ranging from about 30° C. to about 150° C., and wherein at least a part of the imaging layer converts to a colored state when both UV light and temperatures ranging from about 30° C. to about 100° C. are applied to the coated substrate.