Photochromic polyurethane laminate

摘要

A photochromic polyurethane laminate wherein the photochromic polyurethane layer of the laminate has been crosslinked with a 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.

主权项

1. A method of making a photochromic polyurethane laminate comprising:
providing a polyurethane; preparing a solution from said polyurethane; adding an isocyanate prepolymer into said solution; introducing di(trimethylolpropane) as a crosslinking agent into said solution; introducing at least one photochromic dye into said solution; forming a crosslinked photochromic polyurethane layer from said solution; placing said crosslinked photochromic polyurethane layer between a first and a second resin sheet to form a multilayer laminate; and curing said laminate.