Patent · US Expired

Mixtures of blue disperse azo dyestuffs for dyeing synthetic fibers

US4689050A · kind A · utility

4Cited by

6References

17Claims

0Family size

Assignee

Hoechst GmbH · DE

Inventors

Manfred Hahnke · Kelkheim, DE
Reinhard Kuhn · Frankfurt am Main, DE
Reinhard Hahnle
Rudolf Schickfluss

Key dates

Filing date	Dec 20, 1985
Grant date	Aug 25, 1987
Priority date	—
Expiry date	Dec 20, 2005

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S8/924
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Disperse Blue 56 is an important blue dyestuff for dyeing PES fibers at the boil or under high-temperature conditions. This anthraquinonoid compound Disperse Blue 56, in addition to its advantages (high light fastness, pH/reduction insensitivity, purity of hue), has some technical disadvantages (poor leveling properties, pronounced staining of adjacent fiber, metameric red shift). By combining a plurality of blue disperse azo dyestuffs having selected structural features in the form of mixtures or mix-crystals it is possible to match the advantages of Disperse Blue 56 while substantially avoiding its disadvantages at the same time. These azo dyestuffs are based on coupling products of diazotized 2,6-substituted 4-nitroanilines with substituted N,N-dialkylanilines.

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