Patent ID: 7907346
Filing Date: 2011-03-15
Classification: C08G,C09K,G02B,Y10T

Abstract:
1. A photochromic polyester comprising a reaction product of: (a) a hyperbranched polyester polyol comprising, on average, more than two hydroxyl groups; and (b) a photochromic group comprising a group that is adapted to react with a hydroxyl group of the hyperbranched polyester polyol, said group that is adapted to react with a hydroxyl group of the hyperbranched polyester polyol being at least one of isocyanate (—NCO), carboxylic acid (—C(═O)OH), alkyl ester (—C(═O)R), amide (—C(═O)NR wherein the photochromic group is selected from the group consisting of benzopyrans, naphtho[1,2-b]pyrans, naphtho[2,1-b]pyrans, indeno-fused naphthopyrans, heterocyclic-fused naphthopyrans, spiro-9-fluoreno[1,2-b]pyrans, phenanthropyrans, quinopyrans, fluoroanthenopyrans, spiropyrans, benzoxazines, naphthoxazines, spiro-oxazines, fulgides, and fulgimides.