Method of Coloring Hair with Washfast Yellow Imidazolium Direct Dye Compounds
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United States of America Patent
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Mar 20, 2018
Grant Date -
Mar 22, 2018
app pub date -
Sep 16, 2016
filing date -
Sep 16, 2016
priority date (Note) -
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Abstract
Described herein is a method of dyeing the hair. The method includes applying to the hair a hair color composition including one or more direct dye compounds and rinsing the hair with water. The one or more direct dye compounds each include a yellow chromophore, one or two permanent cations, one to four incipient cations, and one or more hydrophobic moieties. The incipient cations are pendant to the core structure and are neutral. The one or more direct dye compounds enter the hair shaft after the hair color composition is applied to the hair. The hair color composition has a pH of from about 7 to about 11. The pH of the hair after rinsing is from about 3.5 to about 6. The rinsing of the hair causes one or more of the one to four incipient cations to change from neutral to positively charged inside of the hair shaft.
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