Methods for making two-phase light-transmissive electrode layer with controlled conductivity

Patent metadata

Field	Value
Publication number	US-2019072803-A1
Application number	US-201816181857-A
Country	US
Kind code	A1
Filing date	Nov 6, 2018
Priority date	Jan 17, 2014
Publication date	Mar 7, 2019
Grant date	—

Abstract

A method of making a two-phase light-transmissive electrode layer comprising a first phase made of a highly electronically-conductive matrix and a second phase made of a polymeric material composition having a controlled volume resistivity.

First claim

1 . A method of making a two-phase light-transmissive electrode layer for incorporation into an electro-optic assembly, the method comprising:
coating a composition comprising a light-transmissive polymeric material and a conductive additive onto a substrate, the substrate contacting a highly electronically-conductive matrix; and drying the composition to create a two-phase light-transmissive electrode layer.

2 . The method of claim 1 , further comprising roll milling the composition comprising the light-transmissive polymeric material and the conductive additive prior to coating.

3 . The method of claim 1 , further comprising removing the substrate after drying to produce a light-transmissive two-phase electrode layer without a substrate.

4 . The method of claim 1 , wherein the conductive additive is a salt, a polyelectrolyte, a polymer electrolyte, or a solid electrolyte.

5 . The method of claim 1 , wherein the conductive additive is polyethylene glycol.

6 . The method of claim 1 , wherein the volume resistivity of the composition comprising a light-transmissive polymeric material and a conductive additive is 1×10 7 to 1×10 12 Ohm-cm.

7 . The method of claim 1 , wherein the highly electronically-conductive matrix comprises carbon nanotubes, silver nanowires, a metal coated open foam structure, or a printed mesh of wires.

8 . The method of claim 1 , wherein the light-transmissive polymeric material comprises a polyurethane, a vinyl acetate, a vinyl acetate ethylene, an epoxy, or a polyacrylic.

9 . The method of claim 1 , wherein the light-transmissive polymeric material comprises a conductive polymer selected from PEDOT-PSS, polyacetylene, polyphenylene sulfide, and polyphenylene vinylene.

10 . The method of claim 1 , wherein the substrate is a polymeric film having a thickness in the range of about 1 to about 25 mil (25 to 634 μm).

Assignees

• E Ink Corp

Inventors

• Paolini Jr Richard J
• Telfer Stephen J

Classifications

• G02F1/155

  Electrodes · CPC title

• G02F2001/1678

  characterised by the composition or particle type · CPC title

• G02F2202/36

  Micro- or nanomaterials · CPC title

• G02B26/026

  based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays (based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167) · CPC title

• G02F1/1508

  using a solid electrolyte · CPC title