Patent · US Expired

Preparation of concentrated solutions of cationic dyes as mono-carboxylates in glycol ether

US4976744A · kind A · utility

3Cited by

4References

4Claims

0Family size

Assignee

BASF SE

Inventors

Johannes P. Dix · Schifferstadt, DE
Guenter Hansen · Ludwigshafen, DE
Hellmut Kast

Key dates

Filing date	Sep 12, 1989
Grant date	Dec 11, 1990
Priority date	—
Expiry date	Sep 12, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S8/927
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Concentrated solutions of cationic dyes are prepared by treating the cationic dyes, which contain as the counterions the anions customarily present during their preparation, with alkali metal salts of monocarboxylic acids and with or without complexing agents in an aqueous glycol ether medium, and separating off the organic phase, which contains the dyes in the form of their monocarboxylic acid salts.

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