Liquid ink composition and method of producing a liquid ink composition
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United States of America Patent
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Aug 21, 2007
Grant Date -
Apr 7, 2005
app pub date -
Sep 22, 2004
filing date -
Oct 2, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid ink composition includes a colorant, a charge control agent, an organosol, a carrier liquid, and a storage stabilizer. The storage stabilizer is a metal salt of a metal cation and an organic anion having 15 to 30 carbon atoms. The liquid ink composition is produced by a method of adding the storage stabilizer in an effective amount to improve the dispersibility and storage stability at high temperatures without deteriorating the electrical property and the optical density of the liquid ink composition. The storage stabilizer can be a metal salt of C.sub.15 to C.sub.30 alkyl carboxylate or a metal salt of a C.sub.15 to C.sub.30 alkyl sulfonate.
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