Photochromic polyurethane laminate

摘要

A process for producing a transparent photochromic polyurethane laminate is disclosed. The process comprises preparing a solvent casting solution by dissolving a solid thermoplastic polyurethane, at least one isocyanate polyurethane prepolymer, and at least one photochromic compound in a solvent; casting the solution on a surface to form a cast film; evaporating the solvent from the cast film to a substantially dry state to form a photochromic polyurethane film; transfer-laminating the photochromic polyurethane film between two transparent resin sheets; and curing the photochromic polyurethane film, thereby forming a photochromic polyurethane laminate.