Particles for electrophoretic displays comprising a core and a random-copolymer coating

Patent metadata

Field	Value
Publication number	US-10126625-B2
Application number	US-201314389793-A
Country	US
Kind code	B2
Filing date	Mar 28, 2013
Priority date	Apr 4, 2012
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

This invention relates to particles comprising a core particle and a polymeric shell, electrophoretic fluids comprising such particles, and electrophoretic display devices comprising such fluids.

First claim

The invention claimed is:

1. An electrophoretic fluid comprising particles comprising a core particle and a polymeric shell adsorbed onto the core particle wherein the polymeric shell consists of a random copolymer having monomer or macromonomer building blocks, and the random copolymer comprises at least one charged or chargeable, optionally hydrocarbon insoluble, structural unit and at least one hydrocarbon soluble, stabilising structural unit consisting of acrylated or methacrylated polycondensates of fatty acids.

2. The electrophoretic fluid according to claim 1 , wherein the charged or chargeable, optionally hydrocarbon insoluble, structural unit of the random copolymer amounts 20-95% by weight of the total random copolymer.

3. The electrophoretic fluid according to claim 1 , wherein the charged or chargeable, optionally hydrocarbon insoluble, structural unit of the random copolymer comprises 2-(tert-Butylamino)ethyl methacrylate, 2-(Diethylamino)ethyl methacrylate, 2-(Dimethylamino)ethyl methacrylate, 2-methacryloxy ethyl trimethyl ammonium chloride (MOTAC), and/or acryloxy ethyl trimethyl ammonium chloride (AOTAC).

4. The electrophoretic fluid according to claim 1 , wherein the hydrocarbon soluble, stabilising structural unit of the random copolymer consists of acrylated or methacrylated polycondensates of fatty acids.

5. The electrophoretic fluid according to claim 1 , wherein the hydrocarbon soluble, stabilising structural unit of the random copolymer consists of acrylated or methacrylated polycondensates of 12-hydroxystearic acid.

6. The electrophoretic fluid according to claim 1 , wherein the core particle is an organic or inorganic pigment.

7. The electrophoretic fluid according to claim 1 , wherein the core particle is an organic or inorganic pigment comprising titanium dioxide in the rutil, anatase, or amorphous modification or carbon black.

8. The electrophoretic fluid according to claim 1 , wherein the hydrocarbon soluble, stabilising structural unit of the random copolymer consists of acrylated or methacrylated polycondensates of fatty acids based on the following monomers: 2-hydroxydecanoic acid, 2-hydroxyoctanoic acid, 2-hydroxyoctanoic acid, 3-hydroxydecanoic acid, 3 hydroxyoctanoic acid, 10-hydroxydecanoic acid, 12-hydroxyoctadecanoic acid, 12-hydroxyoctadecanoic acid, 12-hydroxystearic acid, 15-hydroxypentadecanoic acid, 16-hydroxyhexadecanoic acid, 2-hydroxyhexadecanoic acid, 2-hydroxytetradecanoic acid, 2-hydroxydodecanoic acid, 2-hydroxyhexanoic acid, DL-α-hydroxystearic acid, DL-β-hydroxylauric acid, DL-β-hydroxymyristic acid, DL-β-hydroxypalmitic acid, 2-hydroxy dodecanoic acid, 15-hydroxy-hexadecanoic acid, 17-hydroxy-octadecanoic acid, and 12-hydroxy-9-cis-octadecenoic acid.

9. The electrophoretic fluid according to claim 1 , wherein the random copolymer consists of acrylated or methacrylated polycondensates of 12-hydroxystearic acid, 2-tert-butylaminoethylmethacrylate, and optionally, (2,3-epoxypropyl)-methacrylat.

Assignees

• Merck Patent Gmbh

Inventors

• Greinert Nils
• Bauer Thomas
• Koch Matthias
• Hechler Wolfgang
• Rentschler Thomas
• Smith Nathan

Classifications

• B01J13/10

  Complex coacervation, i.e. interaction of oppositely charged particles · CPC title

• C09C1/3676

  Treatment with macro-molecular organic compounds · CPC title

• C09C3/10

  Treatment with macromolecular organic compounds {(C09C3/006 takes precedence)} · CPC title

• C09B67/0013

  with polymeric coatings · CPC title

• C01P2006/40

  Electric properties · CPC title