Aqueous ink, ink jet recording method, ink cartridge, recording unit, ink jet recording apparatus and image forming method
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United States of America Patent
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Sep 11, 2007
Grant Date -
Jun 22, 2006
app pub date -
Feb 17, 2006
filing date -
Aug 27, 2004
priority date (Note) -
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Abstract
An object of the present invention is to provide an aqueous ink which can form a more excellent image in bleeding resistance, character quality and print density than the image formed by using an aqueous ink containing a conventional self-dispersion pigment and a salt. The aqueous ink includes a self-dispersion pigment and a salt, in which the self-dispersion pigment is a pigment containing a pigment particle having a --R--(COOM.sub.1).sub.n group bonded to a surface of the pigment particle, wherein R represents an alkylene group or an aromatic ring; M.sub.1 represents a hydrogen atom, an alkali metal, an ammonium or an organic ammonium; and n is an integer of 2 or more.
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