Inks comprising modified pigments and methods for making and using the same
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United States of America Patent
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Apr 24, 2012
Grant Date -
May 29, 2008
app pub date -
Oct 31, 2007
filing date -
Oct 31, 2006
priority date (Note) -
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Abstract
An ink composition that includes a self-dispersing pigment that has about 0.02 to about 1.0 mMoles of S and about 0.2 to about 2.0 mMoles of active hydrogen per gram of pigment, water, and an organic solvent. A method of making an ink composition that includes sulfonating a pigment, subsequently oxidizing the pigment to produce a modified pigment, and incorporating the modified pigment into an ink.
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