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US 2003/0117475 A1Published application
Water base ink for ink-jet recording
AssigneeBrother Kogyo Kabushiki Kaisha
InventorsNoriaki Satoh, Masashi Tsuda, Shunichi Higashiyama
Life of this patent
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Abstract
An ink for ink-jet recording comprises water, a basic dye, and a specified pH-adjusting agent. Those usable as the pH-adjusting agent include, for example, monoethanolamine, diethanolamine, ammonium hydrogencarbonate, and sodium carbonate. An image, which is excellent in chromaticness and color feature, can be formed. Further, metal portions, especially an ink tank, a head, and ink flow passages thereof are prevented from corrosion which would be otherwise caused by the ink.
Claims9
An ink for ink-jet recording comprising:
- water;
- a basic dye;
- and
- at least one pH-adjusting agent selected from compounds represented by the following general formulas (1) to (3):
- 4
- wherein each of R1, R2, and R3 is independently H, an alkyl group, or an alkyl group partially substituted with OH;
- MOH (2)
- wherein M represents a monovalent metal;
- and
- ACO3 (3)
- wherein A represents a monovalent metal or a group having ammonium.
8 more elements
Dependencies are inferred from the claim text.