Photochromic polyurethane laminate
A photochromic polyurethane laminate wherein the photochromic polyurethane layer of the laminate has been crosslinked with an isocyanate-active prepolymer using a crosslinking agent. The crosslinking agent is formulated to have at least three functional groups that are reactive with functional groups of the polyurethane or of the isocyanate-active prepolymer. A method of making the photochromic polyurethane laminate includes steps of causing the crosslinking.
1. A photochromic polyurethane laminate comprising:
a crosslinked photochromic polyurethane layer prepared from a composition comprising:
a polyurethane;
an isocyanate prepolymer;
a crosslinking agent comprising a molecule having at least one functional amine group and at least one functional hydroxyl group; and
a photochromic agent;
a first resin layer attached to a first side of the crosslinked photochromic polyurethane layer; and
a second resin layer attached to a second side of the crosslinked photochromic polyurethane layer.
2. The photochromic polyurethane laminate according to claim 1 , wherein the polyurethane is formed from a polycaprolactone diol.