Ink, ink cartridge, and ink jet recording method
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United States of America Patent
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Apr 30, 2013
Grant Date -
Aug 4, 2011
app pub date -
Jan 27, 2011
filing date -
Jan 29, 2010
priority date (Note) -
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Abstract
An ink contains a plurality of pigments and a plurality of polymers. The plurality of pigments include C.I. pigment yellow 4 and C.I. pigment yellow 128. The plurality of polymers include a polymer A and a polymer B. The C.I. pigment yellow 74 is dispersed by the polymer A. The C.I. pigment yellow 128 is dispersed by the polymer B. A hydrogen bond parameter YA of a unit having the smallest hydrogen bond parameter of the constitutional units of the polymer A and a hydrogen bond parameter YB of a unit having the smallest hydrogen bond parameter of the constitutional units of the polymer B satisfy the relationship of YA
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