Method of making functionalized quinacridone pigments

Patent metadata

Field	Value
Publication number	US-11084935-B2
Application number	US-202016846467-A
Country	US
Kind code	B2
Filing date	Apr 13, 2020
Priority date	Nov 11, 2015
Publication date	Aug 10, 2021
Grant date	Aug 10, 2021

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 VII:

wherein R 1 is a hydrogen, a C 1 -C 3 alkyl group, a halogen, a hydroxyl, or —COCR 3 CR 4 COOH;
each R 2 is independently a hydrogen, C 1 -C 3 alkyl group, or a halogen; and
m and n are independently integers between 10 and 200.

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

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

4. An electo-optic display comprising a pigment of claim 1 .

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

6. A pigment comprising Formula VIII:

wherein each R 2 is independently a hydrogen, C 1 -C 3 alkyl group, or a halogen; and
m and n are independently integers between 10 and 200.

7. The pigment of claim 6 , wherein each R 2 is independently —H or —CH 3 .

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

9. An electo-optic display comprising a pigment of claim 6 .

10. A front plane laminate comprising a pigment of claim 6 .

Assignees

• E Ink Corp

Inventors

• Wu Ziyan
• Feick Jason D

Classifications

• 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

• C09D11/107

  from unsaturated acids or derivatives thereof · CPC title

• C09D5/24

  Electrically-conducting paints {(conductive materials H01B1/00)} · CPC title

• C07D471/04

  Ortho-condensed systems · CPC title

• C09B69/109 Primary

  containing other specific dyes · CPC title