Patent ID: 8906183
Filing Date: 2014-12-09
Classification: B29D,B29K,B32B,C08G,C08J,C08K,C08L,G02B,G02C,Y10T

Abstract:
1. A process for producing a transparent photochromic polyurethane laminate, comprising: a) preparing a solvent casting solution by dissolving a solid thermoplastic polyurethane having a molecular weight in a range of about 9,000 to 100,000 grams per mole, at least one isocyanate polyurethane prepolymer, and at least one photochromic compound, in a solvent; b) casting the solution on a release liner film to form a cast film; c) evaporating the solvent from the cast film to a substantially dry state to form a photochromic polyurethane film; d) transfer-laminating the photochromic polyurethane film between two transparent resin sheets; e) curing the photochromic polyurethane film, thereby forming a photochromic polyurethane laminate.