Photochromic polyurethane laminate

Patent metadata

Field	Value
Publication number	US-9869801-B2
Application number	US-201514864748-A
Country	US
Kind code	B2
Filing date	Sep 24, 2015
Priority date	Apr 17, 2009
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

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.

First claim

What is claimed is:

1. 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.

2. The photochromic polyurethane laminate according to claim 1 , wherein at least three functional groups of the crosslinking agent are reactive with hydroxyl groups in said polyurethane.

3. The photochromic polyurethane laminate according to claim 1 , wherein at least three functional groups of the crosslinking agent are reactive with isocyanate groups of the isocyanate prepolymer.

4. The photochromic polyurethane laminate according to claim 1 , wherein said crosslinking agent comprises a multifunctional alcohol having three or more functional hydroxyl groups.

5. The photochromic polyurethane laminate according to claim 1 , wherein said crosslinking agent comprises an oligomer having three or more functional hydroxyl groups.

6. The photochromic polyurethane laminate according to claim 1 , wherein the polyurethane is a thermoplastic polyurethane.

7. The photochromic polyurethane laminate according to claim 1 , wherein the polyurethane comprises a polymerized solution of a prepolymer and a chain extender.

8. The photochromic polyurethane laminate according to claim 1 , wherein said crosslinking agent is di(trimethylolpropane) or trimethylolpropane.

9. 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.

10. The photochromic polyurethane laminate according to claim 9 , wherein the polyurethane is formed from a polycaprolactone diol.

11. 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.

12. The photochromic polyurethane laminate according to claim 11 , wherein the polyurethane is formed from a polycaprolactone diol.

Assignees

• Vision Ease Lp

Inventors

• Vu Hannah
• Sugimura Hideyo
• Fan Ping
• Vu Hao

Classifications

• B29L2011/0016

  Lenses · CPC title

• C08G18/758 Primary

  containing two or more cycloaliphatic rings · CPC title

• Y10T428/31551

  Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.] · CPC title

• C08G18/3206

  aliphatic · CPC title

• C08G18/10

  Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step · CPC title