Ink, image recording process, ink cartridge, recording unit, ink set, crust-preventing method and image forming apparatus
First Claim
1. An ink for ink-jet recording, comprising a coloring material and an aqueous medium, wherein the coloring material comprises a self-dispersing carbon black, including a hydrophilic group bound to the surface thereof directly or through another atomic group, the ink further comprising potassium ions in an amount of 0.6 wt % or more based on the weight of the self-dispersing carbon black, wherein the density of said hydrophilic group is at least 1.8 μ
- mol/m2.
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Accused Products
Abstract
An ink comprises a coloring material and an aqueous medium wherein the coloring material contains a self-dispersing type carbon black, in which self-dispersing carbon black a hydrophilic group combines with the surface of a carbon black directly or through another atomic group, and which ink contains potassium ion in an amount of 0.6% or more of the weight of the carbon black.
65 Citations
44 Claims
- 1. An ink for ink-jet recording, comprising a coloring material and an aqueous medium, wherein the coloring material comprises a self-dispersing carbon black, including a hydrophilic group bound to the surface thereof directly or through another atomic group, the ink further comprising potassium ions in an amount of 0.6 wt % or more based on the weight of the self-dispersing carbon black, wherein the density of said hydrophilic group is at least 1.8 μ
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44. An image recording apparatus, comprising an ink container containing ink and a recording head for ejecting the ink in the form of ink droplets, the recording head provided with an ejection-energy-generating element for applying ejection-energy to the ink,
the ink comprising a coloring material and an aqueous medium wherein the coloring material comprises a self-dispersing carbon black, including a hydrophilic group bound to the surface thereof directly or through another atomic group, and wherein the ink comprises potassium ions in an amount of 0.6 wt % or more based on the weight of the self-dispersing carbon black, and the recording head includes at least one site selected from the group consisting of: -
(i) a site where the direction of a main flow of the ink changes at an angle of at least 90°
, the site being located upstream of the ejection-energy generating element; and
(ii) a site where the width of a main flow of the ink is 20 μ
m or less.
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Specification