Polymer formulations for use with electro-optic media

Patent metadata

Field	Value
Publication number	US-10150899-B2
Application number	US-201715689399-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Jul 23, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

Polymer formulations including urethane acrylates, adhesion promoters, and conductive monomers. By selecting suitable conductive monomers, it is possible to achieve formulations having a volume resistivity from 10 6 to 10 10 Ohm·cm after being conditioned for one week at 25° C. and 50% relative humidity. Such formulations are suitable for incorporation into electro-optic materials, such as electro-optic displays or variable transmission films, e.g., for architectural applications. In other embodiments, the formulations additionally include metal oxide nanoparticles to alter the refractive index and/or conductivity.

First claim

The invention claimed is:

1. A conductive adhesive composition comprising:
a urethane acrylate;
an adhesion promoter;
a conductive monomer comprising alkoxylated acrylate;
an ionic liquid comprising a phosphate, a borate, a sulfonamide, or a cyanamide;
and, wherein the composition has a volume resistivity from 10 6 to 10 10 Ohm·cm after being conditioned for one week at 25° C. and 50% relative humidity.

2. The composition of claim 1 , wherein the ionic liquid is present at less than 0.1 wt. % of the ionic liquid/wt. % of the composition.

3. The composition of claim 1 , further comprising a photoinitator.

4. The composition of claim 1 , further comprising cross-linkers.

5. The composition of claim 1 , further comprising metal oxide particles.

6. The composition of claim 5 , wherein the metal oxide particles have an average particle size of 100 nm or less.

7. The composition of claim 5 , wherein the metal oxide particles comprise a metal with an atomic number greater than 18.

8. The composition of claim 7 , wherein the metal is selected from the group consisting of titanium, copper, indium, zinc, nickel, tin, lanthanum, cerium, and zirconium.

9. The composition of claim 5 , wherein the composition comprises between 0.01 wt. % and 25 wt. % of the metal oxide particles/wt. % of the composition.

10. The composition of claim 1 , wherein the composition contains less than 1% metal.

11. The composition of claim 1 , wherein the molecular weight of the conductive monomer is less than 1000 g/mol.

12. The composition of claim 1 , further comprising a nonconductive monomer that has a volume resistivity of greater than 10 10 Ohm·cm when cured as a homopolymer.

13. The composition of claim 1 , wherein the composition has an index of refraction of 1.0 to 2.0 for visible light.

14. An active material comprising:
an electro-optic medium;
a light-transmissive electrode; and
the conductive adhesive composition of claim 1 .

15. The active material of claim 14 , further comprising a second light-transmissive electrode.

16. A method for fabricating an electro-optic display comprising:
providing an electro-optic medium;
contacting the electro-optic medium with the conductive adhesive composition of claim 1 ; and
curing a coating, thereby creating a smooth surface.

Assignees

• E Ink Corp

Inventors

• Widger Peter Carsten Bailey
• Mccullough Lynne A
• Dewitte Russell J
• Paolini Jr Richard J
• Fauvell Thomas
• Nguyen Jonathan Kim
• BZOWEJ Eugene

Classifications

• G02F2202/28

  Adhesive materials or arrangements · CPC title

• G01N23/223

  by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence · CPC title

• G02F1/167

  by electrophoresis · CPC title

• C09J175/16

  having terminal carbon-to-carbon unsaturated bonds · CPC title

• G01N2223/633

  thickness, density, surface weight (unit area) · CPC title