Disperse Azo Dye Mixtures for Deep-Shade Polyester Fastness

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Solution Overview

Problem

Disperse-azo-dyes with specific substitution patterns in the diazo-component and general structure dyes have unsatisfactory build-up properties and insufficient wash- and contact-fastness, particularly for deeper shades on polyester and polyester blends.

Innovation Solution

A dye mixture comprising specific combinations of azo dyes with particular substitution patterns in the diazo-component and general structure dyes, optimized to improve build-up and fastness properties, including specific ranges for R groups and provisos to ensure at least one non-hydrogen substitution, is used for dyeing polyester and polyester blends.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If disperse-azo-dyes with 2,4,5-substitution pattern in diazo-component are used, then dyeing capability is provided, but build-up properties are unsatisfactory and wash- and contact-fastness are insufficient

Engineering Contradiction:

Improvewash- and contact-fastnessVSAvoidbuild-up properties

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent combines two different dye structures (formula (1) with 2,4,5-substitution pattern and formula (2) with alternative substitution patterns) into a single dye mixture. This merging allows the mixture to achieve both good build-up properties and excellent wash- and contact-fastness, resolving the contradiction between these two performance characteristics that cannot be achieved with either single dye structure alone.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If dyes with general structure (2) are used, then dyeing variety is achieved, but build-up properties remain unsatisfactory for deeper shades

Engineering Contradiction:

Improvedyeing varietyVSAvoidbuild-up for deeper shades

Core Design Contradiction:

Adaptability or versatilityVSProductivity

Solution Approach 1:

The patent merges dyes of structure (2) with specifically designed dyes of structure (1) having 2,4,5-substitution pattern in the diazo component. This combination maintains the versatility and variety of dyes of structure (2) while adding the build-up capability for deeper shades provided by dyes of structure (1), thus resolving the contradiction between dyeing variety and build-up performance.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentEP3715423B1High wet fast disperse dye mixtures of n-[4-(5-fluoro-2,4-dinitro-phenylazo)-phenyl]-amine derivatives and n-[4-(4-nitro-phenylazo)-phenyl]-amine derivatives

Publication Date: 2022.05.11 DYSTAR COLOURS DISTRIBUTION GMBH

AI summary

The present invention is directed to dye mixtures comprising dyes of formula (1) and dyes of formula (2) the process of the production and the use of the dye mixtures.