Phthalocyanine dyes suitable for use in offset inks
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United States of America Patent
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Jul 14, 2009
Grant Date -
Apr 17, 2008
app pub date -
Sep 4, 2007
filing date -
Oct 16, 2006
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Abstract
An IR-absorbing phthalocyanine dye suitable for formulation in a solvent-based or oil-based ink vehicle is disclosed. The phthalocyanine comprises one or more sulfonate groups and a counterion of at least one sulfonate group is a phosphonium cation. Phosphonium salts of sulfonated gallium naphthalocyanines exemplify such dyes.
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