Seiko Epson Corporation

Nippon Shokubai Co., Ltd.

E Ink Corporation

Harunobu Komatsu

Hitoshi Yamamoto

Mitsuo Kushino

Tomoyuki Kuwamoto

Kozo Shitagami

Teruki Matsushita

Masahiko Nakazawa

Akira Matsumoto

Hiroki Nakahara

Takeo Kawase

Soichi Yamazaki

Koichi Terao

Shinobu Yokokawa

Hironobu Hashimoto

Koji Horiba

Nikako Tsukiji

Ken Ikuma

Kiyoshi Nakamura

Takashi Teshima

Keiichi Inoue

Takashi Hiraiwa

Masashi Kanai

Kenji Fukasawa

Yasushi Yamazaki

Takashi Aoki

Tomoko Koyama

Yuji Misawa

Atsushi Kitabayashi

Kei Kamakura

Shinji Takasaki

Hironobu Akutagawa

Akira Masumoto

Teruki Matsuhita

A dispersion liquid includes water, a coloring material, and a dispersion resin that disperses the coloring material, and the dispersion resin has a constituent unit A containing a hydrophobic monomer, a constituent unit B containing an unsaturated aliphatic dicarboxylic acid monomer, and a constituent unit C containing an acrylamide monomer having a sulfonic acid group. The weight-average molecular weight of the dispersion resin is from 10,000 to 100,000, the content of the constituent unit A is 40 mol % or more relative to the total amount of the dispersion resin, and the content of the constituent unit B is 4 mol % or more relative to the total amount of the dispersion resin.

Dispersion resin and dispersion liquid and ink using the same

An ink jet composition of the present disclosure includes water; a polyester resin having sulfo groups; and a colorant, the colorant is contained in particles formed from a material containing the polyester resin, and the particles have an average particle diameter of 100 nm or less and are contained in the ink jet composition at a content rate of 15 percent by mass or more.

Ink jet composition and ink jet recording method

An ink jet composition of the present disclosure includes: water; a polyester resin having sulfo groups; a colorant; and a high molecular weight dispersant having anionic groups, the colorant is contained in particles formed from a material containing the polyester resin, and a rate X1 [percent on molar basis] of the sulfo groups to all constituent monomers of the polyester resin is lower than a rate X2 [percent on molar basis] of the anionic groups to all constituent monomers of the high molecular weight dispersant.

An ink jet composition of the present disclosure includes: water; a polyester resin having sulfo groups; and a colorant, the colorant is contained in particles formed from a material containing the polyester resin, and the sulfo groups have a high abundance ratio at a surface of each of the particles as compared to that at a center thereof.

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.

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

An electrophoretic particle includes a particle and a coating layer, in which the coating layer includes at least one of dispersibility and chargeability, and includes a polymer that connects to the particle, where the polymer includes a first functional group and is connected to the particle via a connected body, the connected body has a molecular weight of 500 or less and includes a second functional group and a third functional group, and the particle, the connected body and the polymer are connected via the chemical bond formed by reacting the first and second functional groups and the chemical bond formed by reacting the hydroxyl group and the third functional group.

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

A method of manufacturing an electrophoretic particle is a method of manufacturing an electrophoretic particle including a particle and a particle surface treatment agent which is bonded to the particle, the method including preparing a mixture containing a plurality of the particles, the particle surface treatment agent, an unreacted product of a raw material used at the time of generating the particle surface treatment agent, and a reaction by-product generated at the time of generating the particle surface treatment agent, the mixture having a content of the particle surface treatment agent which is set to be equal to or greater than 70% by weight in the mixture except for the plurality of particles; and bonding the particle surface treatment agent to a surface of the particle in the mixture.

Method of manufacturing electrophoretic particle, electrophoretic particle, electrophoretic dispersion liquid, electrophoretic sheet, electrophoretic device, and electronic apparatus

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

An electrophoresis dispersion liquid according to the aspect of the invention contains at least one type of electrophoretic particles and a dispersion medium and, in the electrophoresis dispersion liquid, the content of the electrophoretic particles is 10 weight % or more to 30 weight % or less. Furthermore, the electrophoretic particles have base particles and a polymer (particle surface treatment agent) linked with the base particles and, in the electrophoretic particles, the content of the polymer is 5 weight % or more to 15 weight % or less.

Electrophoresis dispersion liquid

An electrophoresis display apparatus of this disclosure is provided with a pair of substrates, an electrophoresis layer including electrophoresis particles and a dispersion medium in which the electrophoresis particles are dispersed, a barrier wall which is arranged between the pair of substrates and divides a cell in which the electrophoresis layer is arranged, and a sealing member which seals the electrophoresis layer arranged in the cell, in which the sealing member includes a first layer and a second layer laminated on the first layer, and in which the electric resistance of the second layer is lower than that of the first layer.

Electrophoresis display apparatus and method of manufacturing electrophoresis display apparatus

An electrophoresis particle of the embodiment includes a mother particle and a covering layer which covers at least a part of the mother particle, wherein the covering layer includes a shell which is consisted of an organic polymer and which cellulary engulfs the mother particle and a polymer which is bonded on the surface of the shell and the polymer is one that a monomer has been polymerized using living radical polymerization, setting the polymerization initiating group as the starting point.

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

An electrophoretic particle of the invention include: a mother particle; and a covering layer, wherein the covering layer includes a plurality of polymers, each of which includes a polymerization initiator which includes a polymerization initiation group linked to a surface of the mother particle and polymerization parts in which monomers are polymerized from the polymerization initiation group as a starting point, wherein each of the polymer include the polymerization initiator, a first polymerization part, which is coupled to the polymerization initiator, in which first monomers that includes monomers with cross-linking groups are polymerized, and a second polymerization part in which second monomers that does not include monomers with cross-linking groups are polymerized, and the polymers are linked to each other at the cross-linking groups of the first polymerization parts via cross-linking agent.

Electrophoretic particle, manufacturing method of electrophoretic particle, electrophoretic dispersed liquid, electrophoretic sheet, electrophoretic apparatus, and electronic equipment

The following is included: loading cells spatially defined by partitions with a dispersion liquid containing electrophoretically mobile particles and a dispersion medium for dispersing the electrophoretically mobile particles, and covering the exposed surface of the dispersion liquid loaded in the cells with a sealing coating to seal the dispersion liquid in the cells. The dispersion medium is a lipophilic hydrocarbon solvent, and the sealing coating is made from a material containing a water-soluble polymer.

Method for manufacturing electrophoretic display apparatus

An electrophoretic display device includes a circuit substrate and an opposed substrate arranged to face each other, a dispersion liquid interposed between the circuit substrate and the opposed substrate, a plurality of platforms arranged to be spaced apart from each other with a slit therebetween in a display region on the circuit substrate, a plurality of reflectors respectively formed on top faces of the plurality of platforms, a slit electrode located in each slit, an opposed electrode formed on the opposed substrate, and an electrophoretic layer filled with a dispersion liquid which contains black particles having a different color from that of the reflectors and being dispersed in a dispersion medium.

Electrophoretic display device and electronic apparatus

A display device includes a display layer provided with a cell in which first particles, second particles, and third particle with colors different to each other are contained, a front side electrode provided on the front side of the display layer, and a first and second back side electrodes provided corresponding to the cell on the back side of the display layer. The first particles are charged. The second particles have a color in a complementary color relation to that of the first particles, are charged with the opposite polarity to that of the first particles, and have a smaller amount of charge than that of the first particles. In the display device, a part where the first particles and the second particles are disproportionately located is set with the third particles dispersed in the cell, to change a color in the cell viewed from the front side electrode side.

Growing community of inventors

Matsumoto, Japan

Harunobu Komatsu