Catalyzed bismuth dye system for human hair

Details Catalyzed bismuth dye system for human hair Catalyzed bismuth dye system for human hair

A - Human Necessities

61

K

167/302

A61K 7/13 (1985.01)

Patent

CA 1197466

INVENTORS HERBERT LAPIDUS AND ALBERT SHANSKY FOR: CATALYZED BIZMUTH DYE SYSTEM FOR HUMAN HAIR ABSTRACT A dyeing system for human hair is provided comprising a bismuth salt, a sulfur source, such as elemental sulfur or thiosulfate, a complexing agent such as triethanolamine, product enhancers, and a catalyst which has a chemical structure having either an oxygen atom possessing a resonating double bond or an oxygen atom of an ether group attached to a carbon atom, such catalyst being characterized by a high degree of solubility in water and having a molecular weight of from about 50 to about 170. The ability of human hair to be effectively colored by a bismuth containing dyeing system involves a complex interaction of a number of components in the dyeing system and requires the presence of an excess of sulfur ions in order to provide the necessary sulfur for the formation of bismuth sulfide or trisulfide in the hair fibers. The catalyst component described hereinbefore provides a convenient means whereby the negative oxygen of the catalyst may attract the positive bismuth ion and the positive carbon of the catalyst may attract the negative sulfur ion. After penetration of the hair fiber and subsequent exsiccation, the attracted ions will unite to form the colored bismuth sulfide or trisulfide component within the hair fiber. This invention provides for a novel system for dyeing human hair comprising a bismuth salt and a catalyst component in admixture with a composition comprising triethanolamine, at least one sulfur containing component, Triton X 100* , and water. * a trade mark

407606

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