Venable LLP
Ink, ink cartridge, and ink jet recording method
An aqueous ink for ink jet includes a coloring material, a solvent, and a surfactant having an HLB value of 9.0 or less. The solvent includes a solvent A having a solubility in water at 20° C. of 5.00 g/100 g-H2O or less and a solvent B other than the solvent A. The solvent A includes an alcohol having a vapor pressure at 20° C. of 0.5 mmHg or less and a surface tension of 30.0 mN/m or more. The content of the alcohol in the aqueous ink is 0.7 or more times the solubility in water at 20° C. in an equal amount to the aqueous ink. The solvent B has a partition coefficient (PB) satisfying the following equation (1). 1.44 Log PA−0.1x−3.4≤Log PB≤−0.6  (1)
Canon Kabushiki Kaisha
B C C B C
B41J C09D C09D B41J C09D
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Masanobu Yutaka Yohei Shoji Takaharu Hidetaka Akihiro Masahiro
Ootsuka Yoshimasa Masada Koike Aotani Kawamura Taya Terada