Coating for humidity indicator, method for production of the coating, and humidity indicator using the coating
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United States of America Patent
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Feb 24, 2015
Grant Date -
May 14, 2009
app pub date -
Apr 25, 2007
filing date -
Apr 26, 2006
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Abstract
Disclosed is a humidity indicator which contains no heavy metal and has good visibility of a color change that occurs when the humidity is increased. The humidity indicator can be produced by applying an aqueous coating comprising a leuco dye, an acidic compound which is in a solid state at ambient temperature, a deliquescent substance and an aqueous resin emulsion onto a substrate such as a resin film, a nonwoven fabric or a paper, and heating and drying the resulting product.
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