Colored liquid composition for editing pen
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United States of America Patent
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Oct 10, 2006
Grant Date -
Apr 8, 2004
app pub date -
Dec 20, 2001
filing date -
Dec 22, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The colored liquid composition of the invention for a highlighter comprises a coloring element and water, the water content by weight lies in the range 10% to 30%. In addition, it comprises at least 40% of a liquid component having surface tension greater than 40 mN/m. In a variant, the coloring element is a tracer solvent having a fluorescent appearance under basic pH, in particular hydroxypyrenetrisulfonic acid, the pH of the composition lying in the range 8 to 9, and the component having surface tension greater than 40 mN/m is triethanolamine. Under such circumstances, the composition contains an acid to neutralize the triethanolamine in part in order to obtain the basic pH, for example hydrochloric acid.
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