Sakata Inx Corporation

Koki Ogasahara

Okinori Nakashima

Yoshiyuki Aoki

Ryohei Miyake

Jun Kinjoh

Ryoichi Nitta

Takuya Myose

Jun Kawabata

A photocurable inkjet printing ink composition satisfies requirements A to F: A: the total content of compounds selected from vinyl methyl oxazolidinone, N,N-dimethylacrylamide, benzyl acrylate, and N-vinylcaprolactam, is 30.0% by mass or higher; B: the total content of compounds selected from saturated hydrocarbon group-containing monofunctional monomers with 6 or more carbon atoms and saturated hydrocarbon group-containing polyfunctional monomers with 6 or more carbon atoms is 15.0% by mass or higher in the photocurable inkjet printing ink composition; C: the content of bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide is 3.5% by mass or higher; D: the total content of ethoxy (2,4,6-trimethylbenzoyl)phenylphosphine oxide and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide is 6.0 to 12.0% by mass, and their ratio is 0.3 to 1.5; E: the content of amine-modified oligomer is 0.5 to 15.0% by mass in the photocurable inkjet printing ink composition; and F: a colorant is included.

Photocurable inkjet printing ink composition

An object is to provide a nonaqueous inkjet ink composition offering excellent solid filling property and anti-mottling property, as well as excellent ink stability, discharge stability, and scratch resistance, even when printed at high speed on printing targets whose printing face is constituted by a polyvinyl chloride, ethylene-vinyl acetate-based copolymer, or other vinyl-based polymer, etc. As a solution, a nonaqueous inkjet ink composition is provided that contains acrylic-based resin, organic coloring pigment and/or carbon black, alumina, pigment dispersant, and organic solvent, wherein the organic solvent comprises propylene carbonate, diethylene glycol dialkyl ether, and dipropylene glycol alkyl ether acetate, and alumina is contained by 5 to 30 parts by mass relative to 100 parts by mass representing the total of organic coloring pigment and carbon black.

Nonaqueous inkjet ink composition

Provided is an ink composition for photo-curable inkjet printing, comprising a pigment, a photopolymerizable compound, and a photopolymerization initiator, wherein the photopolymerizable compound comprises 5 to 30% by mass of an amine-modified oligomer and 5 to 30% by mass of N,N-dimethylacrylamide, wherein the photopolymerization initiator comprises at least any one of ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide, and wherein a total amount of ethoxy(2,4,6-trimethylbenzoyl)phenylphosphine oxide and bis(2,4,6-trimethylbenzoyl)phenylphosphine oxide is 12% by mass or less.

Ink composition for photocurable inkjet printing

An active energy ray-curable inkjet ink composition contains a pigment which contains Pigment Orange 71 and Pigment Violet 19 which is 30.0 to 85.0% by mass relative to a total mass of Pigment Violet 19 and Pigment Orange 71, and a photopolymerizable compound which contains, in a total amount of all polymerizable components,(A) 0.20 to 15.0% by mass of a multifunctional amine-modified oligomer; (B) 50.0% by mass or more of a monofunctional monomer; (C) 35.0% by mass or more of a monofunctional monomer whose glass transition temperature is 20° C. or more; (D) 35.0% by mass or more of a monofunctional monomer whose glass transition temperature is 10° C. or less; (E) 2.0 to 11.0% by mass of a multifunctional monomer whose glass transition temperature is 10° C. or less; and (F) 10.0 to 25.0% by mass of a nitrogen-containing monofunctional monomer.

Active energy ray-curable inkjet ink composition

A nonaqueous inkjet ink composition contains acrylic-based resin, pigment, pigment dispersant, and organic solvent, wherein the nonaqueous inkjet ink composition is characterized in that it contains propylene carbonate, diethylene glycol dialkyl ether, as well as tetraethylene glycol dialkyl ether, as the organic solvent, and is compounded in a manner that the propylene carbonate accounts for 1.0 to 20.0% by mass in the ink composition and the content of the diethylene glycol dialkyl ether relative to the propylene carbonate content, or 'diethylene glycol dialkyl ether/propylene carbonate,' falls between 9.0 and 20.0.

A continuous-type inkjet ink composition includes a polyvinyl butyral resin (Resin 1) and a rosin ester resin (Resin 2), and organic solvents, wherein the content of Resin 1 in the inkjet ink composition is 1.0 to 8.0 percent by mass, and the content ratio of Resin 1 and Resin 2 satisfies 'Resin 1:Resin 2=20:1 to 10:8' based on ratio by mass, and the total quantity of organic solvents regulated by industrial health and safety regulation is 5 percent by mass or less in the inkjet ink composition. The composition demonstrates excellent discharge stability and jetting property as well as excellent adhesion to various types of base printing materials including polyolefin films with no surface treatment.

Continuous-type inkjet ink composition

An object is to provide a continuous inkjet ink composition that has excellent storage stability and anticorrosion effect on a metal member, and that allows printing with good image quality. As a solution, a continuous inkjet ink composition is provided that includes a pigment, a resin, a metal salt of thiocyanic acid at 0.05 to 1.7% by mass in the composition, and tetraalkylammonium hexafluorophosphate at 0.05 to 2.7% by mass in the composition.

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Osaka, Japan

Koki Ogasahara