Water-soluble disazo dyestuffs

US4323497A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Ernst Hoyer · Frankfurt am Main, DE
• Fritz Meininger
• Rudolf Fass · Kelkheim, DE

Key dates

• Filing date: Oct 31, 1978
• Grant date: Apr 6, 1982
• Expiry date: Oct 31, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B62/4411
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

The novel water-soluble disazo dyestuffs consist of two monoazo dyestuff moieties each containing as diazo component an amine of the benzene or naphthalene series and as coupling component an amino-naphthol-mono- or disulfonic acid. The two moieties are bonded to each other via a bridge member bound to the amino groups of the coupling components and comprising two triazine radicals each containing a halogen atom, a sulfonic acid group or a thio ether or oxygen ether group or an amino group and the diazo components contain a fiber-reactive radical of the vinyl sulfone series. The metal-free dyestuffs can be transformed into the corresponding heavy metal complex dyestuffs, preferably copper, cobalt and chromium complex dyestuffs, by treatment with an agent donating a heavy metal cation. The novel dyestuffs are excellently suitable for dyeing and printing fiber material of natural and regenerated cellulose and natural, regenerated and synthetic polyamides. They are distinguished by a high tinctorial strength, a very good uptake from a long liquor, a good color- build up and good printing properties. The dyeings obtained therewith have a high fastness to processing and in use.