Disperse Dye Mixtures for Polyester Fastness

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Solution Overview

Problem

Existing disperse dyes for polyester and its blends suffer from insufficient colour build-up and unsatisfactory fastness properties, particularly in brilliant blue and greenish blue shades, due to low affinity and poor wet fastness.

Innovation Solution

A dye mixture comprising specific dye structures (I, II, III, and IV) with defined substituents, applied in various ratios, enhances colour depth and fastness on polyester and other fibers through optimized dyeing processes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If standard disperse dyes are used for dyeing polyester, then the dyeing process is simple, but the colour build-up is insufficient and fastness properties are unsatisfactory

Engineering Contradiction:

Improvefastness propertiesVSAvoidcolour build-up

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent employs composite dye formulations combining multiple disperse dyes with different molecular structures (naphtholic, anthraquinone, and other chromophores) to achieve synergistic effects. This composite approach allows the dye mixture to simultaneously improve colour build-up on polyester while enhancing wet fastness properties, resolving the contradiction between productivity and reliability

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If Phthalocyanine dye is used, then brilliant blue shades are achieved, but affinity to polyester is very low

Engineering Contradiction:

Improvebrilliant blue shadeVSAvoidaffinity to fibre

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent introduces specific disperse dyes containing naphtholic groups (formula I) that provide local high-affinity sites for polyester binding. These localized affinity regions within the dye molecule enable strong attachment to polyester fibers while maintaining the brilliant blue coloration, thus resolving the contradiction between shade quality and fiber affinity

Inventive Principle:

Principle #3Local quality

3Illumination intensity

If Anthraquinone dyes are used for brilliant blue shades, then the shade area is covered, but wet fastness properties are insufficient

Engineering Contradiction:

Improvebrilliant blue shadeVSAvoidwet fastness

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent merges anthraquinone dyes (formula II) with naphtholic dyes (formula I) in specific combinations where the anthraquinone provides the brilliant blue coloration while the naphtholic components contribute enhanced wet fastness through strong polyester binding. This merging of different dye types with complementary properties resolves the contradiction between shade quality and wet fastness

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The dye mixture achieves improved colour depth and fastness properties on polyester and its blends, particularly in brilliant blue and greenish blue shades, using dispersing agents and specific dyeing conditions.

Implementation Method 1

due to its very low affinity to the fibre

Methodology Applied

Scientific EffectAffinity: Absorption (physical)

Data Source

PatentEP3387072B1High wet fast brilliant blue disperse dye mixtures

Publication Date: 2025.06.25 DYSTAR COLOURS DISTRIBUTION GMBH

AI summary

The present invention is directed to high wet fast brilliant blue disperse dye mixtures comprising dye(s) of formula (I) and of formula (II), their production and their use for textile dyeing and printing.