Colored pigment particles for electrophoretic displays

Patent metadata

Field	Value
Publication number	US-2016018716-A1
Application number	US-201314771400-A
Country	US
Kind code	A1
Filing date	Feb 28, 2013
Priority date	Feb 28, 2013
Publication date	Jan 21, 2016
Grant date	—

Abstract

Electrophoretic displays with an electrophoretic medium having charged pigmented microparticles are disclosed. The microparticles are charged linking molecules polymerized with chromophores of various colors so that microparticles in a variety of colors may be produced. Methods for producing the microparticles and using the microparticles in an electrophoretic display are also disclosed. Such microparticles may be provided separately, or kits may be provided for producing the microparticles.

First claim

1 . An electrophoretic display comprising:
at least one first electrode layer; and an electrophoretic medium disposed adjacent at least one first electrode layer, wherein the electrophoretic medium comprises:
at least one electrically charged particle disposed in a transparent fluid and capable of moving through the transparent fluid upon application of an electrical field to the transparent fluid, wherein at least one charged particle comprises an alternating copolymer of a chromophore and a charged linker molecule.

2 . The electrophoretic display of claim 1 , further comprising at least one microcapsule having the transparent fluid and at least one charged particle retained therein.

3 . The electrophoretic display of claim 1 , wherein the charged linker molecule comprises cations selected from a group comprising quaternary ammonium, quaternary phosphonium, quaternary arsonium, quaternary stibonium, and ternary sulfonium cations.

4 - 6 . (canceled)

7 . The electrophoretic display of claim 1 , wherein the chromophore is a dicarbonyl moiety, a diamine moiety, a dicarboxylic acid, a diacyl halide, a dianhydride, a diester, or a combination thereof.

8 . The electrophoretic display of claim 1 , wherein:
the charged linker molecule comprises at least one of a quaternary ammonium substituent and a quaternary phosphonium substituent; the chromophore is a dicarbonyl moiety, a dicarboxylic acid, a diacyl halide, a dianhydride, a diester or a combination thereof; and the particle is red colored, yellow colored, blue colored, or green colored.

9 - 15 . (canceled)

16 . The electrophoretic display of claim 1 , wherein the particle is a red colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, and each X is individually a C 2 to C 10 alkylene.

17 - 20 . (canceled)

21 . The electrophoretic display of claim 1 , wherein the particle is a yellow colored cationic microparticle having the structure

where M is N or P, each R is individually a C 1 to C 10 alkyl, and each A, X and Q are individually a C 1 to C 10 alkylene.

22 - 24 . (canceled)

25 . The electrophoretic display of claim 1 , wherein the particle is a yellow colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, and each A, X and Q are individually C 1 to C 10 alkylene.

26 - 29 . (canceled)

30 . The electrophoretic display of claim 1 , wherein the particle is a blue colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, each R 1 is individually a C 1 to C 10 alkylene, and each R 2 is individually a C 2 to C 10 alkylene.

31 - 33 . (canceled)

34 . The electrophoretic display of claim 1 , wherein the particle is a blue colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, each R 1 is individually a C 1 to C 10 alkylene, and each R 2 is individually a C 2 to C 10 alkylene.

35 . The electrophoretic display of claim 1 , wherein the transparent fluid comprises at least one of: linear or branched hydrocarbon oil, halogenated hydrocarbon oil, silicone oil, water, decane epoxide, dodecane epoxide, cyclohexyl vinyl ether, naphthalene, tetrafluorodibromoethylene, tetrachloroethylene, trifluorochloroethylene, 1,2,4-trichlorobenzene, carbon tetrachloride, decane, dodecane, tetradecane, xylene, toluene, hexane, cyclohexane, benzene, an aliphatic hydrocarbon, naphtha, octamethyl cyclosiloxane, cyclic siloxanes, poly(methyl phenyl siloxane), hexamethyldisiloxane, polydimethylsiloxane, and poly(chlorotrifluoroethylene) polymer.

36 . The electrophoretic display of claim 1 , wherein at least one electrically charged particle comprises a plurality of the electrically charged particles and the display further comprises:
a first substrate with at least one first electrode layer disposed on the first substrate; a second substrate spaced apart from and opposing the first electrode layer on the first substrate and defining a space between the first substrate and the second substrate; a second electrode layer disposed on an inner surface of the second substrate towards the first electrode layer; and a plurality of microcapsules received in the chamber and sandwiched between the first and second electrode layers, wherein the microcapsules contain the electrophoretic medium therein.

37 . The electrophoretic display of claim 36 , incorporated into one of a cellular telephone, an e-book reader, a tablet computer, a portable computer, a smart card, a sign, a watch or a shelf label.

38 . The electrophoretic display of claim 1 , wherein the display is flexible or non-flexible.

39 - 66 . (canceled)

67 . A charged pigment particle comprising an alternating copolymer of a chromophore and a charged linker molecule, wherein the charged linker molecule comprises cations selected from the group consisting of quaternary ammonium, quaternary phosphonium, quaternary arsonium, quaternary stibonium, and ternary sulfonium cations.

68 - 70 . (canceled)

71 . The charged pigment particle of claim 67 , wherein the chromophore is a dicarbonyl moiety, a diamine moiety, a dicarboxylic acid, a diacyl halide, a dianhydride, a diester, a dialdehyde, a diketone or a combination thereof.

72 - 78 . (canceled)

79 . The charged pigment particle of claim 67 , wherein the particle is a red colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, and each X is individually a C 2 to C 10 alkylene.

80 - 87 . (canceled)

88 . The charged pigment particle of claim 67 , wherein the particle is a blue colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, each R 1 is individually a C 1 to C 10 alkylene, and each R 2 is individually a C 2 to C 10 alkylene.

89 - 95 . (canceled)

96 . The charged pigment particle of claim 67 , wherein the particle is a blue colored cationic microparticle having the structure:

where M is N or P, each R is individually a C 1 to C 10 alkyl, each R 1 is individually a C 1 to C 10 alkylene, and each R 2 is individually a C 2 to C 10 alkylene.

97 - 104 . (canceled)

105 . The charged pigment particle of claim 67 , wherein the particle is a yellow colored cationi

Assignees

• Empire Technology Dev Llc

Inventors

• Klein Josef Peter

Classifications

• G02F1/167 Primary

  by electrophoresis · CPC title

• C09B1/36

  Dyes with acylated amino groups · CPC title

• C09B5/62

  Cyclic imides or amidines of peri-dicarboxylic acids of the anthracene, benzanthrene, or perylene series · CPC title

• C09B43/32

  by reacting carboxylic or sulfonic groups, or derivatives thereof, with amines; by reacting keto-groups with amines · CPC title

• C09B1/16

  Amino-anthraquinones {(C09B1/007 takes precedence)} · CPC title