Aqueous ink, ink cartridge and ink jet recording method
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United States of America Patent
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Jan 3, 2017
Grant Date -
Dec 31, 2015
app pub date -
Jun 25, 2015
filing date -
Jun 30, 2014
priority date (Note) -
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Abstract
The invention provides an aqueous ink containing a self-dispersible pigment having a carboxylic acid group bonded directly or through another atomic group to a particle surface of a pigment and a lactone group bonded to the particle surface of the pigment, wherein, as determined by a selective neutralization method, an introduced amount of the carboxylic acid group is 0.60 mmol/g or more and a ratio of an introduced amount (mmol/g) of the lactone group to the introduced amount (mmol/g) of the carboxylic acid group is 0.20 time or less.
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