Electrophoretic particle, method of manufacturing electrophoretic particle, electrophoresis dispersion liquid, electrophoresis sheet, electrophoresis device, and electronic apparatus

Patent metadata

Field	Value
Publication number	US-10113072-B2
Application number	US-201615255890-A
Country	US
Kind code	B2
Filing date	Sep 2, 2016
Priority date	Sep 18, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

An electrophoretic particle includes a base particle (particle), a first compound, a second compound, and a third compound bonded to the base particle. The first compound is a polymer having a dispersion portion derived from a first monomer, and a bonding portion derived from a second monomer, and is connected to the base particle at the bonding portion. The second compound includes a non-polar group and a second functional group and is connected to the base particle at the second functional group. The third compound includes a charging group and a second functional group and is connected to the base particle at the second functional group.

First claim

What is claimed is:

1. An electrophoretic particle, comprising:
a particle including a first functional group on a surface; and
a first compound, a second compound, and a third compound bonded to the particle,
wherein the first compound is a block copolymer that includes a dispersion portion derived from a first monomer including a site that contributes to dispersibility in a dispersion medium, and a bonding portion derived from a second monomer including a second functional group having reactivity with the first functional group, and is connected to the particle by reacting the functional group and the second functional group in the bonding portion,
the second compound has a lower molecular weight than the first compound, includes a non-polar group and the second functional group, and is connected to the particle by the second functional group reacting with the first functional group, and
the third compound has a lower molecular weight than the first compound, includes a charging group and the second functional group, and is connected to the particle by the second functional group reacting with the first functional group.

2. The electrophoretic particle according to claim 1 ,
wherein the second compound is a silane coupling agent that includes the non-polar group and the second functional group.

3. The electrophoretic particle according to claim 1 ,
wherein the second compound is a block copolymer that includes a non-polar portion derived from a third monomer including the non-polar group, and the bonding portion derived from the second monomer including the second functional group.

4. The electrophoretic particle according to claim 1 ,
wherein the non-polar group is a hydrocarbon group.

5. The electrophoretic particle according to claim 1 ,
wherein the molecular weight of the second compound is 100 or more to 1,000 or less.

6. The electrophoretic particle according to claim 1 ,
wherein the third compound is a silane coupling agent that includes the charging group and the second functional group.

7. The electrophoretic particle according to claim 1 ,
wherein the third compound is a block copolymer that includes a charging portion derived from the third monomer including the charging group, and the bonding portion derived from the second monomer including the second functional group.

8. The electrophoretic particle according to claim 1 ,
wherein the charging group includes at least one of a polarization group and an ionic group.

9. The electrophoretic particle according to claim 1 ,
wherein the molecular weight of the third compound is 100 or more to 1,000 or less.

10. The electrophoretic particle according to claim 1 ,
wherein, in the first compound, the bonding portion is formed by 1 or more to 10 or less units derived from the second monomer.

11. The electrophoretic particle according to claim 1 ,
wherein, in the first compound, the first monomer is a silicone macromonomer represented by the following general formula (I).

[in the formula, R 1 is a hydrogen atom or a methyl group, R 2 is a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R 3 is a structure including one type from an alkyl group having 1 to 6 carbon atoms and an ether group of ethylene oxide or propylene oxide, and n is an integer of 0 or more].

12. The electrophoretic particle according to claim 1 ,
wherein the weight average molecular weight of the dispersion portion is 10,000 or more to 100,000 or less.

13. The electrophoretic particle according to claim 1 ,
wherein, when the weight average molecular weight of the dispersion portion is A and the molecular weight of the second compound is B, A/B is 10 or more to 1,000 or less.

14. A method of manufacturing an electrophoretic particle according to claim 1 , the method comprising:
connecting the third compound to the particle by reacting the first functional group included in the surface of the particle and the second functional group included in the third compound;
connecting the first compound to the particle at the bonding portion by reacting the first functional group included in the surface of the particle and the second functional group included in the first compound; and
connecting the second compound to the particle by reacting the first functional group included in the surface of the particle and the second functional group included in the second compound.

15. A method of manufacturing an electrophoretic particle according to claim 2 , the method comprising:
connecting the third compound to the particle at the bonding portion by reacting the first functional group included in the surface of the particle and the second functional group included in the third compound;
connecting the first compound to the particle at the bonding portion by reacting the first functional group included in the surface of the particle and the second functional group included in the first compound; and
connecting the second compound to the particle by reacting the first functional group included in the surface of the particle and the second functional group included in the second compound.

16. An electrophoresis dispersion liquid, comprising:
the electrophoretic particles according to claim 1 ; and
a dispersion medium.

17. The electrophoresis dispersion liquid according to claim 16 ,
wherein the dispersion medium is silicone oil.

18. An electrophoresis sheet, comprising:
a substrate; and
a structure that is provided on the substrate, and that accommodates the electrophoresis dispersion liquid according to claim 16 .

19. An electrophoresis device, comprising:
the electrophoresis sheet according to claim 18 .

20. An electronic apparatus comprising:
the electrophoresis device according to claim 19 .

Assignees

• Seiko Epson Corp
• E Ink Corp

Inventors

• Inoue Keiichi
• Yokokawa Shinobu
• Nakamura Kiyoshi
• Ushiyama Tomoyuki
• Nakazawa Masahiko

Classifications

• C08G77/20

  containing silicon bound to unsaturated aliphatic groups · CPC title

• C09D183/14

  in which at least two but not all the silicon atoms are connected by linkages other than oxygen atoms (C09D183/10 takes precedence) · CPC title

• G02F1/167 Primary

  by electrophoresis · CPC title

• C09D5/44

  for electrophoretic applications (processes for coating by electrophoresis C25D13/00) · CPC title

• G02F1/172

  based on a suspension of orientable dipolar particles, e.g. suspended particles displays · CPC title