Black ink composition, ink set, and image forming method
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United States of America Patent
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Sep 2, 2014
Grant Date -
Oct 4, 2012
app pub date -
Mar 22, 2012
filing date -
Mar 29, 2011
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Abstract
A black ink composition includes a resin-coated carbon black containing a water-soluble resin and carbon black, a water-soluble polymerizable compound, a polymerization initiator, and water, wherein an average primary particle diameter of the carbon black is 20 nm or more, and an absorbance ratio of absorbance at a wavelength of 350 nm with respect to absorbance at a wavelength of 600 nm (absorbance at a wavelength of 350 nm/absorbance at a wavelength of 600 nm), when the black ink composition is diluted 5,000-fold with water, is 1.9 or lower.
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