Seiko Epson Corporation

E Ink Corporation

Tomoyuki Ushiyama

Kei Hiruma

Mitsunobu Nakatani

Hiroaki Kida

Kiyoshi Nakamura

Shinobu Yokokawa

Keiichi Inoue

Shintaro Asai

Masahiko Nakazawa

Kenta Tsukada

Masaru Terada

Hiroshi Takiguchi

A water-based composition of the present disclosure includes a metal pigment, a polyoxyalkylene amine compound, and a water-based medium, in which the metal pigment is formed of a plurality of metal particles, the metal particles are surface-modified by a surface treatment agent, and a content of the polyoxyalkylene amine compound is 0.1 parts by mass or more and 50 parts by mass or less with respect to 100 parts by mass of the metal particles.

Water-based composition and coloring method

An ink jet ink composition contains a metal pigment and at least one liquid medium selected from the group consisting of organic solvents and water. The metal pigment is surface-modified with a surface treatment agent. The metal pigment is in the form of scale-like particles and has a volume average particle size Dof 1.0 μm or less. The ratio D/Z of the volume average particle size Dof the metal pigment to the average thickness Z of the metal pigment particles is 17 or more, and the ratio D/L of the volume average particle size Dto the nozzle diameter L of the ink jet head is 0.050 or less.

Ink jet ink composition and ink jet printing method

A metal pigment composition of the present disclosure is a coloring composition or a composition to be used for preparation of the coloring composition and includes: a metal pigment; a polyoxyalkyleneamine compound; and a liquid medium component, the metal pigment includes metal particles, the metal particles are surface-modified with a surface treatment agent, and the surface treatment agent is at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2)(A-R—O)P(O)(OH)  (1)(A-R)P(O)(OH)  (2).

Metal pigment composition and coloring method

A coloring composition of the present disclosure includes a metal pigment; an acrylic-based resin having an acid value of 200 mgKOH/g or less; and a liquid medium component, the metal pigment includes metal particles, the metal particles are surface-modified with a surface treatment agent, and the surface treatment agent includes at least one selected from the group consisting of a compound represented by the following formula (1) and a compound represented by the following formula (2).(RO)P(O)(OH)  (1)(R)P(O)(OH)  (2)

Coloring composition and coloring method

An ink jet printing method includes a metallic ink application step of ejecting a metallic ink composition containing a metallic pigment from an ink jet head to apply the metallic ink composition onto a printing medium, a heating step of heating the metallic ink composition applied on the printing medium with an infrared heater, and a coloring ink application step of ejecting a coloring ink composition containing a coloring material from an ink jet head to apply the coloring ink composition onto the metallic ink composition on the printing medium. Each of the metallic ink composition and the coloring ink composition is a water-based ink or a solvent-based ink.

Ink jet printing method and ink jet printing apparatus

A recording method of the present disclosure, which is a recording method of performing recording on a recording medium by using a recording device including an ink jet head, includes ejecting a composition for ink jet from the ink jet head, in which the composition for ink jet contains a metal pigment, the metal pigment is formed of a plurality of scaly metal particles, the ink jet head includes a circulation flow path for circulating the composition for ink jet, and an average thickness of the metal particles determined by atomic force microscopy is 19 nm or less.

Recording method and recording device

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.

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

An electrophoretic particle includes a base particle (particle) that includes a first functional group, and a first compound and a second compound bonded to the base particle. The first compound is a polymer that includes a dispersion portion derived from a first monomer that contributes to dispersibility and a bonding portion derived from a second monomer including a second functional group having reactivity to the first functional group, and is connected to the base particle at 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 base particle at the second functional group.

An electrophoresis dispersion liquid includes first electrophoretic particle of a scattering system having an ionic group on a surface thereof; second electrophoretic particle of a coloring system having a polarization group on the surface thereof; and a dispersion medium. It is preferable that the ionic group is an acidic group, and further includes a ring structure that forms an acidic group and a salt. It is preferable that the polarization group is an organic group having a main skeleton, and a substituent bonded to the main skeleton.

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Chino, Japan

Tomoyuki Ushiyama