Ink, method for improving intermittent dischargeability of ink-jet recording apparatus, method for recording image, recording unit, ink cartridge, ink set, and image recording apparatus
First Claim
1. An ink containing a coloring material and an aqueous medium, the coloring material comprising a self-dispersing carbon black in which at least one hydrophilic group is bonded to the surface of the carbon black directly or through another atomic group,wherein a Ka value of the ink determined by a Bristow'"'"'s test method is less than 1.5, and the total amount of monovalent cations in the ink is in a range of 0.05 to 1 mole/liter.
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Abstract
An ink contains a coloring material and an aqueous medium. The coloring material is composed of a self-dispersion-type carbon black. At least one hydrophilic group is bonded to the surface of the carbon black directly or through another atomic group. A Ka value of the ink determined by a Bristow'"'"'s test method is less than 1.5, and the total amount of monovalent cations in the ink is in a range of 0.05 to 1 mole/liter. This ink exhibits superior ink-jet recording characteristics.
39 Citations
23 Claims
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1. An ink containing a coloring material and an aqueous medium, the coloring material comprising a self-dispersing carbon black in which at least one hydrophilic group is bonded to the surface of the carbon black directly or through another atomic group,
wherein a Ka value of the ink determined by a Bristow'"'"'s test method is less than 1.5, and the total amount of monovalent cations in the ink is in a range of 0.05 to 1 mole/liter.
- 7. A method for improving intermittent dischargeability of an ink in an ink-jet recording apparatus having a means for applying energy to an ink in an ink channel of an ink-jet recording head so as to discharge the ink from an orifice, wherein the ink contains a self-dispersing carbon black and an aqueous medium, a Ka value of the ink determined by a Bristow'"'"'s test method is less than 1.5, and the total amount of monovalent cations in the ink is in a range of 0.05 to 1 mole/liter.
Specification