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US 9,869,801 B2Granted
Photochromic polyurethane laminate
AssigneeVision Ease, LP
InventorsHannah Vu, Hideyo Sugimura, Ping Fan, Hao Vu
Life of this patent
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Abstract
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.
Claims12
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 having functional groups that react with one of a hydroxyl group of the polyurethane or an isocyanate group of the isocyanate prepolymer, the crosslinking agent employed in the composition at a weight percent of less than one and greater than or equal to 0.04;
- and
- at least one photochromic compound.
6 more elements
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 multifunctional alcohol having more than three functional hydroxyl 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.
6 more elements
A photochromic polyurethane laminate comprising:
- a crosslinked photochromic polyurethane layer prepared from a composition comprising:
- a polyurethane;
- an isocyanate prepolymer;
- a crosslinking agent comprising an oligomer having three or more functional hydroxyl groups, the crosslinking agent employed in the composition at a weight percent of less than one and greater than or equal to 0.04;
- 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.
6 more elements
Dependencies are inferred from the claim text.