Photochromic polyurethane laminate

摘要

Photochromic polyurethane laminates and methods for the formation of same wherein a photochromic polyurethane layer of the laminate is interposed between two primer coated transparent resin sheets.

主权项

1. A method of making a photochromic polyurethane laminate comprising:
(a) forming a photochromic polyurethane composition from the steps comprising:
forming an isocyanate-terminated prepolymer by reacting a polyol with an aliphatic diisocyanate or an cycloaliphatic diisocyanate;forming a hydroxyl-terminated polyurethane by reacting a polyol with an aliphatic diisocyanate or a cycloaliphatic diisocyanate and a chain extender; andreacting the isocyanate-terminated prepolymer and the hydroxyl-terminated polyurethane to form a reaction mixture;adding one or more photochromic compounds to the reaction mixture; (b) forming a photochromic polyurethane film from said photochromic polyurethane composition; (c) forming a polyurethane primer by reacting an isocyanate-terminated prepolymer that is distinct from the isocyanate-terminated prepolymer employed to form the photochromic polyurethane composition with at least one component selected from a group consisting of a hydroxyl-terminated chain extender and a hydroxyl-terminated crosslinking agent; (d) coating a first side of a first transparent resin sheet and a first side of a second transparent resin sheet with the polyurethane primer; and (e) laminating said photochromic polyurethane film between the first sides of said first and said second transparent resin sheets.