Photochromic polyurethane laminate
AssigneeHOYA Optical Labs of America, Inc.
InventorsHannah Vu, Hideyo Sugimura, Ping Fan, Hao Vu
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Abstract
A photochromic polyurethane laminate wherein the photochromic polyurethane layer of the laminate has been crosslinked with an 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.
Claims19
A photochromic polyurethane laminate comprising:
- a crosslinked photochromic polyurethane layer prepared from a composition comprising:
- a polyurethane;
- an isocyanate prepolymer;
- a crosslinking agent comprising a heat-activated urea compound having two or more functional urea groups;
- and
- a photochromic agent;
- a first resin layer attached to a first side of the crosslinked photochromic polyurethane layer;
- and
- a second resin layer attached to a second side of the crosslinked photochromic polyurethane layer.
A photochromic polyurethane laminate comprising:
- a first resin layer;
- a second resin layer;
- and
- a crosslinked photochromic polyurethane layer disposed between the first and the second resin layers, the crosslinked photochromic polyurethane layer formed of a composition comprising:
- a polyurethane;
- an isocyanate prepolymer;
- a crosslinking agent comprising a heat-activated urea compound having at least two urea functional groups that react with hydroxyl groups of the polyurethane;
- and
- at least one photochromic compound.
A photochromic polyurethane laminate comprising:
- a first resin layer;
- a second resin layer;
- and
- a crosslinked photochromic polyurethane layer disposed between the first resin layer and the second resin layer, the crosslinked photochromic polyurethane layer formed of a composition comprising:
- a thermoplastic polyurethane prepared from a composition comprising an aliphatic diisocyanate, a diol and a chain extender;
- an isocyanate prepolymer prepared from a composition comprising an aliphatic diisocyanate and a diol;
- a crosslinking agent comprising a heat-activated urea compound;
- and
- at least one photochromic compound.
Dependencies are inferred from the claim text.