Patent · US Expired

Oxidation hair dyes comprising diamino-substituted pyridines and amino-substituted aromatics as precursors

US4784667A · kind A · utility

5Cited by

1References

8Claims

0Family size

Assignee

Henkel Kommanditgesellschaft auf Aktien · DE

Inventors

Norbert Maak · Neuss, DE
Peter Flemming · Oak Park, US
Dieter Schrader · Goldkronach, DE

Key dates

Filing date	Oct 7, 1985
Grant date	Nov 15, 1988
Priority date	—
Expiry date	Oct 7, 2005

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K8/4926
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

This invention is directed to oxidation hair dye compositions and their use in the dyeing of human hair. The compositions consist essentially of precursors comprising 2,3-diamino-6-methoxy-pyridines and aromatic amines or diamines. The combination of oxidation dye precursors according to the invention gives bright, deep blue dye finishes having high stability to heat and light.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.