Dainippon Ink and Chemicals, Incorporated

Hisao Yamaguchi

Yutaka Yamada

Osamu Oshima

Naohito Saito

The object of the present invention is to provide an active energy ray-curable ink-jet printing ink, including: a coloring agent; a compound having an ethylenic double bond; and a photo-polymerization initiator, wherein the photo-polymerization initiator includes a compound represented by general formula (1): (wherein A represents any one of &#x2014;O&#x2014;, &#x2014;CH&#x2014;, &#x2014;CH(CH)&#x2014;, and &#x2014;C(CH)&#x2014;; and each of Rand Rindependently represents a hydrogen atom, a methyl group, or a trimethylsilyl group), and an &#x3b1;-aminoketone-based compound and/or an acyl phosphine oxide-based compound, and 40% by mass or more of the compound represented by general formula (1) is included with respect to the total photo-polymerization initiator.

Active energy ray-curable ink-jet printing ink

An ink composition for ultraviolet curable ink-jet recording including carbon black, a photopolymerizable compound and a photopolymerization initiator, comprising at least one selected from the group consisting of non-metallic phthalocyanine sulfonic acids, metal phthalocyanine sulfonic acids in which the central metal is Cu, Fe, Ni, Co, or Ti, and metal salts thereof, and a polymer dispersant containing a basic functional group. The photopolymerizable compound may dissolve the polymer dispersant.

Ink composition for ultraviolet curable ink-jet recording

An ultraviolet-curable white ink composition for ink jet recording is provided which has good dispersibility and good redispersibility and has excellent ejection stability, and provides excellent visibility of printed matter having a base material which forms a black or dark background. In an ultraviolet-curable ink composition for ink jet recording comprising titanium oxide, a polymeric dispersant having a basic functional group, a photopolymerizable compound and a photopolymerization initiator, the titanium oxide is surface-treated with silica and alumina and the weight of the silica, which coexists with the titanium oxide, is larger than that of the alumina.

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Ageo, Japan

Hisao Yamaguchi