Patent Number: 6,166,129

Title: Photochromic polyurethanes

Abstract: The present invention relates to a novel photochromic polyurethane consisting essentially of an isocyanate reactive mixture consisting essentially of: i) from about 40 to about 85% by weight of one or more polyols having a nominal functionality of from 2 to 4 and molecular weights of from 500 to 6000 g/mole; ii) from about 15 to about 60% by weight of one or more diols or triols or mixtures thereof having a functionality of from 2 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.

Inventors: Rosthauser; James W. (Pittsburgh, PA), Haider; Karl W. (McKees Rocks, PA), Krishnan; Sivaram (Pittsburgh, PA), Rieck; James N. (Wheeling, WV)

Assignee: Bayer Corporation

International Classification: C08K 3/20 (20060101); C08K 3/00 (20060101); C08K 5/34 (20060101); C08K 5/35 (20060101); C08J 3/00 (20060101); C08K 5/00 (20060101); C08L 75/00 (20060101); C08J 003/00 (); C08K 003/20 (); C08K 005/34 (); C08K 005/35 (); C08L 075/00 ()

Expiration Date: 12/26/2017