Patent · US Expired

Preparation of aminoazo dyes

US5424403A · kind A · utility

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5References

5Claims

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Assignee

BASF SE

Inventors

Rudolf Bermes · Ludwigshafen, DE
Heinz Keilhauer · Birkenheide, DE

Key dates

Filing date	May 20, 1994
Grant date	Jun 13, 1995
Priority date	—
Expiry date	May 20, 2014

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07D209/62
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

Aminoazo dyes are prepared from the corresponding N-sulfomethylated aminoazo dyes by aqueous acid hydrolysis in the presence of amidosulfuric acid, urea or mixtures thereof.

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