Seiko Epson Corporation

Eiko Epson Corporation

Keitaro Nakano

Takashi Oyanagi

Hiroaki Kida

Hiroshi Fukumoto

Toru Saito

Chigusa Sato

Toshiyuki Yoda

Midori Sekine

Hitoshi Tsuchiya

Mitsuaki Yoshizawa

Kyohei Tanaka

Hiroki Nakane

Tetsuya Aoyama

Jun Ito

Mikito Nakajima

Chiyoshige Nakazawa

Atsushi Yoshida

Kazushige Inoue

Tsuyoshi Sano

Masaaki Ando

Yuko Hishida

Kiyohiko Takemoto

Toyohiko Mitsuzawa

Nobuhito Takahashi

Masahiro Ueda

Hiroshi Takiguchi

Masaaki Itano

Masaki Uchiyama

Keita Ichihara

Yoshiyuki Suzuki

Tomohiro Numajiri

Takashi c/o Seiko Epson Corporation Oyanagi

A photo-curable ink jet ink set includes an undercoating photo-curable ink jet ink containing a (meth)acrylic acid ester having a vinyl ether group expressed by general formula (I), and an overcoating photo-curable ink jet ink. The undercoating photo-curable ink jet ink has a higher surface tension than the overcoating photo-curable ink jet ink.

Photo-curable ink jet ink set and ink jet recording method using the same

There is provided a maintenance liquid, which is used in maintenance of a device equipped with a discharge head for discharging an ultraviolet ray curable-type composition containing the acyl phosphine oxide-based photopolymerization initiator toward an attachment object, including a polymerizable compound in which a saturation solubility of an acyl phosphine oxide-based photopolymerization initiator at 20° C. is equal to or greater than 5.0% by mass.

Maintenance liquid and maintenance method

A radiation-curable ink jet composition includes a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component, a photopolymerization initiator, and titanium oxide as a white color material. The content of the monofunctional monomer component is 90 mass % or more based on the total amount of the polymerizable compound component, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 48° C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.

Radiation-curable ink jet composition and ink jet method

The present invention provides a photocurable ink composition for ink jet recording with excellent curability. The photocurable ink composition for ink jet recording includes polymerizable compounds, a photopolymerization initiator, and a colorant, wherein the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by general formula (I):CH═CR—COOR—O—CH═CH—R  (I)(wherein Ris a hydrogen atom or a methyl group, Ris a divalent organic residue having 2 to 20 carbon atoms, and Ris a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms) and phenoxyethyl (meth)acrylate.

Photocurable ink composition for ink jet recording and ink jet recording method

Provided is an ink jet recording method including: discharging first ultraviolet curable ink of a radical polymerization reaction type which contains a radical photopolymerization initiator and a radical polymerization compound and in which transmittance at a wavelength of 395 nm is equal to or less than 1%, onto a recording medium; and curing the first ultraviolet curable ink which is landed on the recording medium by irradiating the ink with ultraviolet light, in which a light source which initially emits the ultraviolet light in the curing of the ink is an ultraviolet light emitting diode in which peak intensity of the irradiated ultraviolet light is equal to or more than 800 mW/cm.

Ink jet recording method, ultraviolet curable ink, and ink jet recording apparatus

An ink set of radiation curable ink jet inks each of which contains polymerizable compounds, includes a color ink and a clear ink, the polymerizable compounds contained in the clear ink include a monomer A having a hydroxy group and a monomer B having a volume of 0.26 nmor more and a height direction area of 0.25 nmor more with respect to a long side each of which is defined by the Van der Waals radii, and a total content of the monomer A and the monomer B is 80 percent by mass or more with respect to a total mass of the polymerizable compounds contained in the clear ink.

Ink set and ink jet method

There is provided a maintenance liquid, which is used in maintenance of a device equipped with a discharge head for discharging an ultraviolet ray curable-type composition containing the acyl phosphine oxide-based photopolymerization initiator toward an attachment object, including a polymerizable compound in which a saturation solubility of an acyl phosphine oxide-based photopolymerization initiator at 20&#xb0; C. is equal to or greater than 5.0% by mass.

Provided is an ink set of radiation-curable ink jet compositions each including a polymerizable compound component. The ink set includes a color ink and a clear ink as the radiation-curable ink jet compositions. The polymerizable compound component contained in the clear ink includes a monomer A having a volume of 260 angstromor more and an area of 25 angstromor more in the height direction with respect to a long side defined by a van-der-Waals radius, and the content of the monomer A contained in the clear ink is 80 mass % or more based on the total amount of the polymerizable compound component.

An ink jet method includes an ejecting step of ejecting a radiation-curable ink jet composition from an ink jet head and an irradiating step of irradiating the ejected radiation-curable ink jet composition with an ultraviolet ray at an irradiation intensity of 3 to 10 W/cmby using a light emitting diode. The radiation-curable ink jet composition contains monofunctional monomers including a nitrogen-containing monofunctional monomer. The amount of the nitrogen-containing monofunctional monomer relative to the total amount of the radiation-curable ink jet composition is 5 to 40 mass %.

Ink jet method and ink jet apparatus

A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the polymerizable compound. The monofunctional monomer component includes a nitrogen-containing monofunctional monomer component, and the content of the nitrogen-containing monofunctional monomer component is 14 mass % or less based on total amount of the radiation-curable ink jet composition. The weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42&#xb0; C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.

Radiation-curable ink jet composition and recording method

A radiation-curable ink jet composition comprises a polymerizable compound component including a monofunctional monomer component and a multifunctional monomer component. The content of the monofunctional monomer component is 87 mass % or more based on the total amount of the polymerizable compound component, the monofunctional monomer component includes a monofunctional acrylate containing a polycyclic hydrocarbon group, and the weighted average of the glass transition temperatures of homopolymers of the respective polymerizable compounds is 42&#xb0; C. or more when the mass ratios of the contents of the respective polymerizable compounds are weighted.

The present invention provides a photocurable ink composition for ink jet recording with excellent curability. The photocurable ink composition for ink jet recording includes polymerizable compounds, a photopolymerization initiator, and a colorant, wherein the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by general formula (I):CH&#x2550;CR&#x2014;COOR&#x2014;O&#x2014;CH&#x2550;CH&#x2014;R&#x2003;&#x2003;(I)(wherein Ris a hydrogen atom or a methyl group, Ris a divalent organic residue having 2 to 20 carbon atoms, and Ris a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms) and phenoxyethyl (meth)acrylate.

A radiation-curable ink jet ink set includes a radiation-curable dark-colored ink having a surface tension &#x3b3;1 and a radiation-curable light-colored ink having a surface tension &#x3b3;2. The surface tensions of the radiation-curable inks satisfy &#x3b3;1&#x3e;&#x3b3;2.

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Matsumoto, Japan

Keitaro Nakano