Seiko Epson Corporation

Hiroyuki Kajimoto

Toru Saito

Hiroaki Kida

Chigusa Sato

Jun Ito

Toshiyuki Miyabayashi

Hiroki Nakane

Satoru Miura

Taketoshi Kagose

Shoki Kasahara

Provided is an ultraviolet-curable ink jet ink composition with excellent curability and storage stability, the composition containing a monomer A represented by 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 C-Cdivalent organic residue, and Rrepresents a hydrogen atom or a C-Cmonovalent organic residue); a (meth)acrylated amine compound; a hindered amine compound other than the (meth)acrylated amine compound; and a photopolymerization initiator.

Ultraviolet-curable ink jet ink composition

Provided are a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 20 to 50 mass % of the total reaction components, and a black pigment (F1); and a radiation-curable ink composition including phenoxyethyl acrylate (A) in an amount of from 20 to 55 mass % of the total reaction components, a multifunctional acrylate (B) in an amount of from 10 to 50 mass % of the total reaction components, and a yellow pigment (F2).

Radiation-curable ink composition, ink jet recording method, and recorded matter

The ink jet recording apparatus comprises a recording head provided with a nozzle forming surface provided with nozzles which discharge an ink composition containing inorganic pigments, and a liquid repelling film which is provided on the nozzle forming surface; a maintenance unit for preserving the recording head; and a movement section which is arranged at a position which faces the nozzle forming surface and the maintenance unit and which relatively moves the nozzle forming surface and the maintenance unit.

Ink jet recording apparatus

A radiation-curable ink composition includes an acrylate monomer of which homopolymer has a glass transition temperature of not higher than 0&#xb0; C. in an amount of 20% by mass or more and 65% by mass or less based on the total amount of reaction components; a monofunctional acrylate having an alicyclic structure; and a multifunctional acrylate having an alicyclic structure.

Radiation-curable ink composition, ink jet recording process, and recorded matter

A radiation-curable ink composition contains (A) aminoacrylate at 1 mass % to 10 mass %, inclusive, (B) phenoxyethyl acrylate at 20 mass % to 50 mass %, inclusive, and (C) tetraethylene glycol diacrylate at 1 mass % to 20 mass %, inclusive, in its reaction component, as well as (E) bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide at 3 parts by mass to 8 parts by mass, inclusive, (F) 2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide at 3 parts by mass to 5 parts by mass, inclusive, in 100 parts by mass of the reaction component, and (G) diethylthioxanthone at 1 part by mass to 3 parts by mass, inclusive, in 100 parts by mass of the reaction component.

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Matsumoto, Japan

Hiroyuki Kajimoto