PHOTOCHROMIC POLYURETHANES

摘要

The present invention relates to a novel photochromic polyurethane comprising an isocyanate reactive mixture comprising: i) from about 20 to about 60% by weight of one or more polyols having a functionality of from 1.8 to 4 and molecular weights of from 500 to 6000 g/mole; ii) from about 5 to about 35% by weight of one or more diols or triols or mixtures thereof having a functionality of from 1.8 to 3 and molecular weights of from 62 to 499; b) an aliphatic polyisocyanate having a functionality ranging from about 2 to about 3; and c) a photochromic compound selected from a group consisting of spirooxazines, fulgides, fulgimides, and naphthopyrans, wherein the photochromic compound is present in an amount of 0.01 to 5 parts per hundred parts by weight of the isocyanate reactive mixture.