Scratch color-developable ink and invisible information printed sheet
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United States of America Patent
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Oct 9, 2012
Grant Date -
Jan 28, 2010
app pub date -
Dec 19, 2007
filing date -
Dec 19, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Disclosed are a scratch color-developable ink comprising an electron-donating colorless or light-color dye precursor, an electron-accepting color developer and a varnish, wherein a solid particle component contained therein has an average particle diameter of 0.3 to 25 μm, a scratch color-developable ink comprising an electron-donating colorless or light-color dye precursor, an electron-accepting color developer and a varnish, wherein an azaphthalide compound is contained as the electron-donating colorless or light-color dye precursor, and an invisible information printed sheet obtained by printing invisible information on a support with the above scratch color-developable ink.
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