Toshiba Tec Kabushiki Kaisha

Kabushiki Kaisha Toshiba

Yukiko Kawakami

Toru Ushirogouchi

Kazuhiko Ohtsu

Ryozo Akiyama

Mitsuru Ishibashi

Hiroshi Kiyomoto

Masashi Hiroki

A photosensitive inkjet ink is provided, which includes a photo-acid generating agent, pigment, and an organic dispersion medium containing at least two kinds of polymerizable compounds selected from the group consisting of an oxetane compound and a vinyl ether compound, at least one kind of the polymerizable compounds being a monofunctional compound at a concentration of 20 to 70% based on a total weight of the organic dispersion medium, and the vinyl ether compound at a concentration of 30% or more based on a total weight of the organic dispersion medium. The vinyl ether compound is selected from the following chemical formula. 

Photosensitive inkjet ink

An inkjet ink is provided, which includes a pigment dispersion containing an organic dispersant, a black pigment having an average particle diameter of not more than 200 nm, and a resinous dispersing agent, the organic dispersant being formed of at least one polymerizable compound, and the black pigment being included therein at an amount ranging from 2 to 30% by weight based on the organic dispersant, and an ionic compound. A &#x3b6;-potential of the black pigment to the at least one polymerizable compound of the organic dispersant is confined within the range of &#x2212;10 mV to +100 mV.

Inkjet ink

There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1): R&#x2014;R&#x2014;(R)p (wherein R(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R(s) is vinyl ether group or a group having a vinyl ether skeleton, Ris a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).

There is provided an inkjet ink comprising a photo-acid generating agent which is capable of generating an acid as it is irradiated with light, a color component, and an acid-polymerizable compound which can be polymerized in the presence of an acid, wherein at least 40% of the acid-polymerizable solvent is a vinyl ether compound represented by the following general formula (1):R&#x2014;R&#x2014;(R)&#x2003;&#x2003;(1) (Wherein R(s) is a group selected from the group consisting of a vinyl ether group, a group having a vinyl ether skeleton, an alkoxy group, substituted hydroxyl group and hydroxyl group wherein at least one of R(s) is vinyl ether group or a group having a vinyl ether skeleton, Ris a group comprising a substituted or unsubstituted cyclic skeleton and having a valence of (p+1), and p is a positive integer including zero).

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Mishima, Japan

Yukiko Kawakami