Photochromic Polyrethane Laminate

摘要

Photochromic polyurethane laminates and methods for the formation of same 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.

主权项

1. A photochromic polyurethane laminate for use in an optical article comprising:
a first resin sheet; a second resin sheet; a photochromic polyurethane layer disposed between said first and second resin sheet; said photochromic polyurethane layer formed from a composition comprising a prepolymer, di(trimethylolpropane), and one or more photochromic compounds; said prepolymer formed from a composition comprising:
a polycarbonate polyol;an aliphatic diisocyanate.