Patent · US Expired

Composition and method for the oxidative dyeing of hair

US4883656A · kind A · utility

49Cited by

0References

10Claims

0Family size

Assignee

Wella GmbH · DE

Inventors

Eugen Konrad · Darmstadt, DE
Herbert Mager · Freiberg, DE
Axel Hoffmann · Berlin, DE

Key dates

Filing date	Nov 12, 1987
Grant date	Nov 28, 1989
Priority date	—
Expiry date	Nov 12, 2007

Classification

Technology area (CPC A)Human Necessities
CPC primaryA61K8/4973
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

A composition and method for the oxidative dyeing of hair based on a combination of coupler substance and developer substance, wherein they contain PA0 (A) 5-amino-2-methylphenol as coupler substance and PA0 (B) 4-amino-3-methylphenol and PA0 (C) 1,4-diaminobenzene and/or 2,5-diaminotoluene as developer substances, also in the form of the physiologically compatible salts. The new composition enables the production of neutral red color shades which are free from yellow and virtually free of blue portions and, in addition to the high dye intensity and brilliance, have an outstanding dye equality with very good absorptive power.

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