Ligand exchange thermochromic systems and high ε ligands for same

• US 8,431,045 B2
• Filed: 05/22/2012
• Issued: 04/30/2013
• Est. Priority Date: 09/01/2006
• Status: Active Grant

• Current Assignee: Pleotint LLC
• Original Assignee: Pleotint LLC
• Inventors: Byker, Harlan J., Ogburn, Paul H. Jr., Vander Griend, Douglas A., Veldkamp, Brad S., Winkle, Derick D.
• Primary Examiner(s): Joyner, Kevin
• Application Number:
  US13/477,736
• Publication Number:
  US 20120292581A1
• Time in Patent Office: 343 Days
• Field of Search: 252/408.1, 252/582
• US Class Current: 252/408.1
• CPC Class Codes: B32B 17/10005 laminated safety glass or glazing
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10174 Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
• CPC Class Codes: B32B 17/10477 thermochromic
• CPC Class Codes: B32B 17/10651 comprising colorants, e.g. dyes or pigments
• CPC Class Codes: B32B 17/10678 comprising UV absorbers or stabilizers, e.g. antioxidants
• CPC Class Codes: B32B 17/10761 containing vinyl acetal
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 2369/00 Polycarbonates
• CPC Class Codes: C09K 2211/187 of the iron group metals, i.e. Fe, Co or Ni
• CPC Class Codes: C09K 9/02 Organic tenebrescent materials
• CPC Class Codes: G02F 1/0147 based on thermo-optic effects G02F1/132 takes precedence

Abstract

Ligand exchange of thermochromic, LETC, systems exhibiting a reversible change in absorbance of electromagnetic radiation as the temperature of the system is reversibly changed are described. The described LETC systems include one or more than one transition metal ion, which experiences thermally induced changes in the nature of the complexation or coordination around the transition metal ion(s) and, thereby, the system changes its ability to absorb electromagnetic radiation as the temperature changes. In accordance with certain aspects of the present invention, thermochromic systems are disclosed comprising a transition metal ion with particularly useful ligands, such as phosphine compounds, tridentate ligands that coordinate through three nitrogen atoms, bidentate ligands, or ortho hindered pyridine monodentate ligands.

Claims

1. A thermochromic system which comprises:

a) a transition metal ion

b) a phosphine compound of the following structure

2. The thermochromic system of claim 1 wherein the thermochromic system additionally comprises iodide.

3. The thermochromic system of claim 1 wherein the transition metal ion is selected from the group consisting of Fe(II), Co(II), Ni(II), Cu(II) and mixtures thereof.

4. The thermochromic system of claim 1 wherein the phosphine compound is selected from the group consisting of ethyldiphenylphosphine, triphenylphosphine, tricyclohexylphosphine and mixtures thereof.

5. The thermochromic system of claim 1 wherein the thermochromic system additionally comprises a diol, a triol, or a polyol.

6. The thermochromic system of claim 1 wherein the thermochromic system additionally comprises a polymer.

7. The thermochromic system of claim 6 wherein the polymer is poly(vinyl butyral-co-vinyl acetate-co-vinyl alcohol).