Ink, ink set, ink cartridge, recording unit, color-image recording apparatus, image recording process, color-image forming process, and method for improving density of ink-jet recorded image
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United States of America Patent
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Feb 18, 2003
Grant Date -
N/A
app pub date -
Sep 14, 2000
filing date -
Sep 17, 1999
priority date (Note) -
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Abstract
An ink is provided which suppresses the influence of the kinds of recording media on the image quality, is excellent in image quality, effectively inhibits the occurrence of bleed upon the formation of color images, is excellent in long-term shelf stability and stably forms high quality images. The ink contains at least one salt selected from the group consisting of (M.sup.1).sub.2 SO.sub.4, CH.sub.3 COO(M.sup.1), Ph-COO(M.sup.1), (M.sup.1)NO.sub.3, (M.sup.1)Cl, (M.sup.1)Br, (M.sup.1)I, (M.sup.1).sub.2 SO.sub.3 and (M.sup.1).sub.2 CO.sub.3, wherein M.sup.1 represents an alkali metal, ammonium or organic ammonium, and Ph represents a phenyl group, and a self-dispersing anionic carbon black having a functional-group density of at least 1.8 (.mu.mol/m.sup.2) on its surface.
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