Ink, image recording process, ink cartridge, recording unit, ink set, crust-preventing method and image forming apparatus
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United States of America Patent
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Apr 15, 2003
Grant Date -
Mar 28, 2002
app pub date -
Jun 18, 2001
filing date -
Jun 23, 2000
priority date (Note) -
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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.
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