Functionalized quinacridone pigments

Patent metadata

Field	Value
Publication number	US-10196523-B2
Application number	US-201715667037-A
Country	US
Kind code	B2
Filing date	Aug 2, 2017
Priority date	Nov 11, 2015
Publication date	Feb 5, 2019
Grant date	Feb 5, 2019

Abstract

Quinacridone pigments that are surface-functionalized with glycidyl methacrylate, maleic anhydride, or 4-methacryloxyethyl trimellitic anhydride to create a functionalized pigment. The functional groups are then activated to bond hydrophobic polymers, thereby coating the pigment with the hydrophobic polymers. The quinacridone pigments can be used for a variety of applications. They are well-suited for use in electro-optic materials, such as electrophoretic media for use in electrophoretic displays.

First claim

The invention claimed is:

1. A pigment comprising Formula VI:

wherein R 1 is a hydrogen, a C 1 -C 3 alkyl group, a halogen, a hydroxyl, or —COCR 3 CR 4 COOH;
R 2 is a hydrogen, C 1 -C 3 alkyl group, or a halogen;
R 3 is hydrogen or a hydrophobic polymer having a molecular weight between 5 kD and 100 kD; and
R 4 is hydrogen or a hydrophobic polymer having a molecular weight between 5 kD and 100 kD.

2. The pigment of claim 1 , wherein the hydrophobic polymer is a polymer comprising lauryl acrylate, lauryl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, hexyl acrylate, hexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, n-octadecyl acrylate, n-octadecyl methacrylate, or a combination thereof.

3. The pigment of claim 1 , comprising Formula VII:

wherein m and n are independently integers between 10 and 200.

4. The pigment of claim 1 , comprising Formula VIII:

wherein m and n are independently integers between 10 and 200.

5. The pigment of claim 1 , wherein R 2 is —H or R 2 is —CH 3 .

6. An electrophoretic a medium comprising a pigment of claim 1 .

7. An electro-optic display comprising a pigment of claim 1 .

8. A front plane laminate comprising a pigment of claim 1 .

Assignees

• E Ink Corp

Inventors

• Wu Ziyan
• Feick Jason D

Classifications

• C09D11/033

  characterised by the solvent · CPC title

• C08F120/18

  with acrylic or methacrylic acids · CPC title

• G02F1/167

  by electrophoresis · CPC title

• C09B69/109 Primary

  containing other specific dyes · CPC title

• C09D4/00

  Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16} · CPC title