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

Patent metadata

Field	Value
Publication number	US-10150877-B2
Application number	US-201615185747-A
Country	US
Kind code	B2
Filing date	Jun 17, 2016
Priority date	Jun 30, 2015
Publication date	Dec 11, 2018
Grant date	Dec 11, 2018

Abstract

According to the invention, an electrophoretic dispersion liquid includes at least one type of an electrophoretic particle, and a dispersion medium, in which the content of transition metal of group 8 elements derived from a catalyst which is used to generate at least one of a block copolymer (a particle surface treatment agent) used to form the electrophoretic particle and the dispersion medium is in a range of greater than 0 ppm to equal to or less than 2 ppm in the electrophoretic dispersion liquid.

First claim

What is claimed is:

1. An electrophoretic dispersion liquid comprising:
at least one type of electrophoretic particles; and
a dispersion medium,
wherein
the content of transition metal of group 8 elements is in a range of greater than 0 ppm to equal to or less than 2 ppm in the electrophoretic dispersion liquid,
at least one of the particle surface treatment agent and the dispersant is a siloxane-based compound which is a polymer compound,
the siloxane-based compound which is used as the particle surface treatment agent is a block copolymer which contains a dispersion portion which is formed by polymerizing first monomers and a bonding portion which is formed by polymerizing second monomers having a functional group, and is bonded to the electrophoretic particle when the functional group and a hydroxyl group are reacted with each other in the bonding portion, and
the first monomer is a silicone macromonomer expressed by the following Formula (I):

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

2. The electrophoretic dispersion liquid according to claim 1 ,
wherein the transition metal of group 8 element is derived from a catalyst which is used to generate at least one of a particle surface treatment agent used to form the electrophoretic particle and a dispersant added to the dispersion medium.

3. The electrophoretic dispersion liquid according to claim 1 ,
wherein the transition metal of group 8 element is at least one of a period 5 element and a period 6 element.

4. The electrophoretic dispersion liquid according to claim 1 ,
wherein in the electrophoretic dispersion liquid, the transition metal of group 8 element is present in a state where at least one of a complex and salt which contain the transition metal of group 8 element is formed.

5. The electrophoretic dispersion liquid according to claim 1 ,
wherein the siloxane-based compound used as the dispersant is a modified silicone compound.

Assignees

• E Ink Corp

Inventors

• Komatsu Harunobu
• Nakazawa Masahiko
• Nakamura Kiyoshi
• Nakahara Hiroki

Classifications

• C09D5/4419 Primary

  with polymers obtained otherwise than by polymerisation reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G02F2001/1678

  characterised by the composition or particle type · CPC title