Seiko Epson Corporation

Toshiyuki Yoda

Toru Saito

Keitaro Nakano

Hitoshi Tsuchiya

Naoki Koike

Kiyoshi Nakamura

Hiroaki Kida

Kyohei Tanaka

Tetsuya Aoyama

Midori Sekine

Hiroshi Fukumoto

Masaaki Ando

Keita Hanawa

Yuko Hishida

Takuya Ota

Shohei Namikoshi

Yoshinobu Yoshida

An ink jet recording method includes ejecting a radiation-curable ink jet composition to a recording medium from an ink jet head, and curing the ink jet composition ejected to the recording medium by irradiating with radiation from a LED irradiator having a peak wavelength of 250 to 310 nm to form a cured coating film. The ink jet composition contains a polymerizable compound and an α-hydroxyketone-based initiator.

Ink jet recording method and ink jet recording apparatus

A radiation-curable ink jet composition used in an ink jet printing apparatus including an ink jet head using a material with an SP value of 7.0 (J/cm)to 8.0 (J/cm)in a flow path is provided. The radiation-curable ink jet composition contains polymerizable monomers A including at least one polymerizable monomer B with an SP value of 7.0 (J/cm)or less or 8.0 (J/cm)or more and at least one polymerizable monomer C with an SP value of more than 7.0 (J/cm)to less than 8.0 (J/cm). The amount of the at least one polymerizable monomer B is 20% by mass or more relative to the total mass of the ink jet composition, and the amount of the at least one polymerizable monomer C is 22.5% by mass or less relative to the total mass of the ink jet composition.

Radiation-curable ink jet composition and ink jet printing apparatus

An ink jet recording apparatus including an ink jet head for ejecting and attaching a radiation-curable ink jet composition to a recording medium, an inert gas supply portion for supplying an inert gas to the recording medium to which the radiation-curable ink jet composition is attached, and an irradiation portion for applying radiation to the radiation-curable ink jet composition attached to the recording medium under supply of an inert gas, wherein the inert gas supply portion slantingly ejects the inert gas toward just under the irradiation portion.

Ink jet recording apparatus having an inert gas supply portion

A radiation curable ink jet composition includes polymerizable compounds; and a photopolymerization initiator, the polymerizable compounds include a vinyl ether group-containing (meth)acrylate represented by the following general formula (I), a content of the vinyl ether group-containing (meth)acrylate with respect to a total mass of the radiation curable ink jet composition is 15 percent by mass or more, and the photopolymerization initiator includes ethyl (2,4,6-trimethylbenzoyl)phenylphosphinate.HC═CR—CO—OR—O—CH═CH—R  (I)In the above formula, Rrepresents a hydrogen atom or a methyl group, Rrepresents a divalent organic residue having 2 to 20 carbon atoms, and Rrepresents a hydrogen atom or a monovalent organic residue having 1 to 11 carbon atoms.

Radiation curable ink jet composition and ink jet method

A radiation-curing ink jet ink composition includes a urethane (meth)acrylate including one (meth)acryloyl group, the amount of the urethane (meth)acrylate being 5.0% by mass or more and 30.0% by mass or less of the total amount of the ink composition, and a (meth)acrylate including an aromatic ring and one (meth)acryloyl group, the amount of the (meth)acrylate being 4.0% by mass or more and 50.0% by mass or less of the total amount of the ink composition.

Ink composition

A radiation-curable ink jet composition includes a multifunctional monomer and a vinyl methyl oxazolidinone. The content of the multifunctional monomer is 5 to 50 mass % based on the total amount of the radiation-curable ink jet composition.

Radiation-curable ink jet composition and ink jet method

An ink jet method records a radiation-curable ink composition containing a polymerizable compound. The radiation-curable ink composition includes a first ink composition and a second ink composition. The ink jet method includes a first discharging step of discharging the first ink composition with an ink jet head to adhere the composition to a recording medium, a first curing step of irradiating the first ink composition adhered to the recording medium with radioactive rays, a cooling step of cooling the recording medium, a second discharging step of discharging the second ink composition with the ink jet head to adhere the composition to the cooled recording medium at least in a part of the region where the first ink composition adhered; and a second curing step of irradiating the second ink composition adhered to the recording medium with radioactive rays.

Ink jet method and ink jet recording apparatus

A radiation-curable ink jet composition includes vinyl methyl oxazolidinone and a vinyl ether group-containing (meth)acrylate represented by the following formula (1):HC&#x2550;CR&#x2014;CO&#x2014;OR&#x2014;O&#x2014;CH&#x2550;CH&#x2014;R(where, Ris a hydrogen atom or a methyl group, Ris a divalent C2-C20 organic residue, and Ris a hydrogen atom or a monovalent C1-C11 organic residue).

A radiation-curable ink jet composition includes a monofunctional (meth)acrylate monomer and vinyl methyl oxazolidinone.

A UV-curable ink jet ink composition includes: 10.00% by mass or more and 60.00% by mass or less, relative to a total mass of the ink composition, of a compound represented by formula (A); 10.00% by mass or more and 50.00% by mass or less, relative to the total mass of the ink composition, of one or more monofunctional monomers having an alicyclic hydrocarbon group or a cyclic ether group; 0.05% by mass or more and 0.50% by mass or less, relative to the total mass of the ink composition, of one or more fluorescent brighteners including a compound represented by formula (b1), (b2), (b3), or (b4); and 3.00% by mass or more and 8.00% by mass or less, relative to the total mass of the ink composition, of one or more acylphosphine oxide polymerization initiators.

UV-curable ink jet ink composition

A radiation curable ink comprises a compound represented by the following Formula (I): a compound represented by the following Formula (II): and a compound represented by the following Formula (III): 

Radiation curable ink

A radiation-curable ink jet composition contains at least one monomer A represented by general formula (I): CH&#x2550;CR&#x2014;COOR&#x2014;O&#x2014;CH&#x2550;CH&#x2014;R, wherein Rrepresents a hydrogen atom or a methyl group, Rrepresents a divalent organic moiety having a carbon number of 2 to 20, and Rrepresents a hydrogen atom or a monovalent organic moiety having a carbon number of 1 to 11. The composition also contains a cyclic, linear, or branched monomer B containing a (meth)acryloyloxy or (meth)acryloyl group in which the total number of nitrogen atoms and oxygen atoms other than the oxygen atoms contained in the (meth)acryloyloxy or (meth)acryloyl group is at least 2, and at least one monomer C represented by the following general formula (II): 

Radiation-curable ink jet composition and ink jet printing method

A radiation curable ink jet composition contains an acrylate oligomer (A), a monofunctional monomer (B), and a predetermined monomer (C), in which the acrylate oligomer (A) has 1 to 3 acryloyl groups, the glass transition temperature of a homopolymer of the monofunctional monomer (B) is &#x2212;20&#xb0; C. or more and 30&#xb0; C. or less, and the content of the monofunctional monomer (B) is 40% by mass or more based on the entire radiation curable ink jet composition.

Radiation curable ink jet composition and recording method

A radiation-curable ink jet composition contains monomer A represented by formula (1), a mono-, bi-, or trifunctional urethane (meth)acrylate oligomer, and an N-vinyl compound:CH&#x2550;CR&#x2014;COOR&#x2014;O&#x2014;CH&#x2550;CH&#x2014;R&#x2003;&#x2003;(1)where Rdenotes &#x2014;H or &#x2014;CH, Rdenotes an organic residue having 2 to 20 carbon atoms, and Rdenotes a hydrogen atom or an organic residue having 1 to 11 carbon atoms.

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Matsumoto, Japan

Toshiyuki Yoda