Seiko Epson Corporation

Soichi Yamazaki

Ken Ikuma

Hiroshi Kato

Naoyuki Toyoda

Hiroaki Kumeta

Shunsuke Uchizono

Hiroyuki Murakami

Manabu Taniguchi

Ayako Nishiki

Harunobu Komatsu

Hideki Okada

Koichi Terao

Koji Horiba

Nikako Tsukiji

Masahide Nakamura

Miharu Kanaya

Takatomo Fukumoto

Akio Ito

Daisuke Ishihara

Yoshitaka Miyajima

Rie Miyazaki

Toshikazu Ono

An ink jet ink composition includes: a colorant; silica particles; 1-(2-hydroxyethyl)-2-pyrrolidone; and water, and the silica particles have in a TEM image thereof, a Di (diameter of the maximum inscribed circle)/Dc (diameter of the minimum circumscribed circle) of 0.7 or more.

Ink jet ink composition and recording method

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.

A white pigment composition contains titanium oxide having an average particle diameter Dof less than 100 nm; and hollow particles having an average particle diameter Dof 100 nm or more.

White pigment composition and recorded matter

An ink for ink jet recording according to an embodiment is an ink for ink jet recording containing pigment, colloidal silica, amine, and amino acid.

Ink for ink jet recording, ink jet recording apparatus, and ink jet recording method

An aqueous ink jet ink composition contains pigment particles, inorganic oxide particles, and resin particles. The content of the inorganic oxide particles is 1.0% to 10.0% relative to the total mass of the ink composition. The ink composition satisfies the following relationship:

Aqueous ink jet ink composition and ink jet printing method

An ink jet printing ink composition contains a pigment, colloidal silica, trimethylglycine, and water, and in which a content of the colloidal silica is lower than or equal to a content of the trimethylglycine.

Ink jet printing ink composition and ink jet printing method

An ink composition contains pigment particles, inorganic oxide particles, and a lactam solvent. The content of the inorganic oxide particles is 5.0% to 10.0% relative to the total mass of the ink composition. The ink composition satisfies the following relationship:

An ink for ink jet recording according to an embodiment is an ink for ink jet recording containing pigment, colloidal silica, and amino acid.

An ink jet recording apparatus includes a line head including a region of nozzles that are formed in an intersecting direction intersecting a transport direction of a recording medium and eject an ink, the region covering a printing region of the recording medium in the intersecting direction, a drying unit that dries the recording medium, a transport unit that transports the recording medium, and a control unit. The ink contains colloidal silica, and the control unit controls the drying unit and the transport unit such that drying of the ink is started within 0.4 second after the ink is attached to the recording medium.

Ink jet recording apparatus and ink jet recording method

Provided is an ink set including black ink and color ink, in which the black ink contains carbon black having a carboxyl group on a surface thereof, a resin particle having a carboxyl group on a surface thereof, betaine, an alkali ion, and water, the alkali ion contains a potassium ion, a sodium ion, and an organic alkali compound, and a content of the potassium ion is the largest among the alkali ions.

Ink set and recording apparatus

According to the invention, there is provided an ink set which contains at least one ink selected from a group of a black pigment ink, a self-dispersing color pigment ink, and a resin-dispersion color pigment ink. The moisture quantity of the black pigment ink is from 68 mass % to 75 mass %. The moisture quantity of the self-dispersing color pigment ink is from 62 mass % to 72 mass %. The moisture quantity of the resin-dispersion color pigment ink is from 68 mass % to 75 mass %.

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Shiojiri, Japan

Soichi Yamazaki