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Actinic radiation curable magenta ink composition, actinic radiation curable ink jet recording magenta ink and method for image formation and ink jet recording apparatus using said ink, and actinic ra
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An ink composition, ink jet recording technology, applied in the directions of reproduction/marking method, printing, ink, etc., can solve the problems of uneven color density, clogging, and large performance fluctuation of printed products
Inactive Publication Date: 2007-11-07
KONICA MINOLTA MEDICAL & GRAPHICS INC
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[0008] However, these printing inks also have problems with the dispersion of pigments.
Moreover, when the dispersion is unstable, the performance fluctuation during long-term storage is large, and as a result, there is a problem that the color density of the printed matter is uneven during printing.
In addition, when the dispersibility is unstable, there are also problems such as the following when performing high-definition printing; in gravure printing, the pores of the thin lines on the cylinder plate (Silinda-plate) are clogged, in flexographic printing Clogging of fine lines of metal ink rollers
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Embodiment 1
[0107] [Preparation of dispersion liquid]
[0108] Dispersion liquids A to E were prepared as follows.
[0109]
[0110] Each of the following compounds was put into a stainless steel beaker and dissolved under heating and stirring for 1 hour while heating on a 65° C. hot plate.
[0111] Solspray 32000 (a dispersant manufactured by Abishia Co., Ltd., acid value 24.8 mgKOH / g, amine value 27.1 mgKOH / g) 8 parts
[0112] Tetraethylene glycol diacrylate (2 functional) 72 parts
[0113] After cooling to room temperature, 20 parts of the following pigment 1 were added thereto, put into a glass bottle together with 200 g of zirconia beads with a diameter of 1 mm, and plugged and sealed, and the zirconia beads were removed after dispersing with a paint shaker for 6 hours to prepare Dispersion A (comparative).
[0206] Using each of the pigment dispersions described in Example 1, the pigment concentration (addition amount of the dispersion) was adjusted as follows to prepare flexographic printing inks 6 to 10.
[0207] (Ink for flexographic printing 6)
[0208] Dispersion A 40.0 parts
[0209] Photopolymerizable compound (lauryl acrylate: monofunctional) 9.9 parts
[0210] Photopolymerizable compound (tetraethylene glycol diacrylate: bifunctional) 20.0 parts
[0211] Photopolymerizable compound (trimethylolpropane triacrylate: trifunctional) 25.0 parts
[0212] Modified silicone oil (SDX-1843: manufactured by Asahi Denka Kogyo Co., Ltd.) 0.1 part
[0213] Photoradical initiator (Irgakiyua 184: manufactured by Chiba Specialty Chemical Co., Ltd.) 2.5 parts
[0214] Photoradical initiator (Irgacyua 819: manufactured by Chiba Specialty Chemicals Co., Ltd.) 2.5 parts
[0215] (Inks for Flexographic Printing 7)
[0216] Dispersion B 35.0 parts
[0217] Photopolymerizable compound (la...
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Abstract
This invention provides an actinic radiation curable magenta ink composition having excellent storage stability, an actinic radiation curable ink jet recording magenta ink possessing excellent ejection stability and storage stability and a method for image formation and an ink jet recording apparatus using said ink, and an actinic radiation curable printing magenta ink having excellent storage stability. The actinic radiation curable magenta ink composition comprises at least one quinacridone pigment, a dispersant, a photopolymerizable compound, and a photoinitiator. When the actinic radiation curable magenta ink composition is bar coated onto a pore-type medium having a porosity of 50 to 70% and a 60-degree gloss value, as specified in JIS K 5600, of the surface of not less than 30, to form a coating which is then left to stand for 30 min, the 60-degree gloss value as specified in JIS K 5600 is 95 to 140.
Description
technical field [0001] The present invention relates to an active ray-curable magenta ink composition excellent in storage stability, an active ray-curable inkjet recording magenta ink excellent in both ejection stability and storage stability, an image forming method using the ink, and an inkjet ink Active light-curable printing magenta ink with excellent storage stability for recording devices. Background technique [0002] In recent years, the inkjet recording method has been used in various printing fields such as photography, various types of printing, logos, special printing such as color filters, etc., because images can be produced easily and inexpensively. In particular, it uses a recording device that controls fine recording dots, inks that have improved color reproduction, durability, and ejection adaptability, and dramatically improved ink absorption, color rendering properties, and surface gloss. It is also possible to obtain image quality comparable to silver ...
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