Canon Kabushiki Kaisha

Ryosuke Nagao

Takeshi Miyazaki

Masashi Hirose

Yasuaki Murai

Minako Kawabe

Kaoru Takahashi

Satoshi Kudo

Junichi Sakai

Kei Inoue

Jun Yoshizawa

Hideki Yamakami

Yoshihide Aikawa

Yutaka Tani

Kuniaki Fujimoto

Yukako Tamanuki

Yoshio Kinoshita

Masahiro Suenaga

Otome Yamashita

Otome Mori

Kenta Ohtsuka

Provided is an aqueous ink for ink jet that has excellent storage stability and whose viscosity does not easily increase even in a case where the ink is stored in a severe environment such as a high temperature condition. This aqueous ink for ink jet contains a coloring material and a block copolymer. The block copolymer includes an A block having a segment A having no acid group and a group represented by Formula (1) bonded to one terminal of the segment A, and a B block having a segment B having an acid group and a group represented by Formula (2) bonded to one terminal of the segment B.  (In Formula (1), Rrepresents an alkylene group, and M represents a hydrogen atom, an alkali metal, ammonium or organic ammonium. In Formula (2), Rand Reach independently represent an alkyl group or the like.)

Aqueous ink, ink cartridge and ink jet recording method

There are provided a new compound which has the following general formula (1) and which is useful as a coloring material, an ink containing the compound, an ink cartridge containing the ink and an ink jet recording method including ejecting the ink from a recording head of an ink jet system to record an image on a recording medium. 

Compound, ink, ink cartridge and ink jet recording method

Provided is an ink capable of recording an image that is excellent in ozone resistance, hardly causes blurring or color change even in a high-humidity environment, and is excellent in humidity resistance. The ink includes a coloring material and a lithium ion. The coloring material includes a compound represented by the following general formula (I) and a content of the lithium ion in the ink is 3.5 times or more in terms of molar ratio with respect to a content of the compound represented by the general formula (I). 

Ink, ink cartridge and ink jet recording method

The present invention is a colorant compound represented by the following general formula (1): wherein at least one of R, R, Rand Ris an acylamino group represented by the following general formula (2): wherein Rdenotes one of an alkyl group, a cycloalkyl group, an aryl group, an arylalkyl group, an alkenyl group and a heterocyclic group; and '*' denotes a bonding site with an aromatic ring of the general formula (1).

Colorant compound

Growing community of inventors

Kawasaki, Japan

Ryosuke Nagao