Method for de-coloring shellac, de-colored shellac, compositions comprising same, and uses therefor
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United States of America Patent
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Mar 1, 2016
Grant Date -
Mar 6, 2014
app pub date -
Jul 15, 2013
filing date -
Sep 5, 2012
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Abstract
A method for producing de-colored shellac by dissolving colored shellac in an aqueous solution comprising an alkaline agent; contacting the colored shellac in the aqueous solution with a sufficient amount of a chlorite salt to achieve de-coloration of the shellac; precipitating the de-colored shellac by neutralizing the aqueous solution with an acid; and recovering the precipitated de-colored shellac from said aqueous solution. The de-colored shellac produced is non-toxic and suitable for human use. Dental compositions comprising the de-colored shellac are disclosed, as well as uses of the de-colored shellac as a food product coating, a nail polish or varnish, and a wood varnish.
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