Disperse Azo Dye Mixture Composition for Polyester Wash-Fastness

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Solution Overview

Problem

Existing disperse azo dyes exhibit unsatisfactory wash- and contact-fastness properties on polyester and polyester blends, particularly in polyester-elastane/polyester-spandex materials, despite being known for decades.

Innovation Solution

A novel dye mixture comprising specific combinations of dyes with 2-oxo-alkylketo groups, including at least one dye of formula (1) and at least one dye of formula (3), along with optional dyes of formula (2) and (4), which are mixed and homogenized to enhance wash- and contact-fastness properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional disperse azo dyes are used on polyester and polyester blends, then the dyeing process is simple and well-established, but the wash- and contact-fastness properties are unsatisfactory

Engineering Contradiction:

Improvewash- and contact-fastness propertiesVSAvoiddye mixture composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by combining multiple disperse azo dyes with different chemical structures (formulae 1-5) into a synergistic dye mixture. This composite approach allows the mixture to achieve superior wash- and contact-fastness properties that individual dyes cannot provide alone, while maintaining compatibility with standard polyester and polyester blend substrates

Inventive Principle:

Principle #40Composite materials

2Reliability

If existing disperse azo dyes are used for decades, then the dyeing process is well-established and simple, but the reduction stability and fastness properties remain unsatisfactory

Engineering Contradiction:

Improvereduction stability and fastness propertiesVSAvoiddye mixture preparation complexity

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies parameter changes by systematically varying the chemical structure parameters of disperse azo dyes (specifically the 2-oxo-alkylketo groups and aromatic amine components) to optimize reduction stability and fastness properties. The defined structural parameters in formulae 1-5 with specific R group variations enable tailored dye mixtures with enhanced performance while maintaining manufacturability

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional dyes are used on polyester-elastane/polyester-spandex, then the processing is straightforward, but the dry-heat and sublimation fastness properties are insufficient

Engineering Contradiction:

Improvedry-heat and sublimation fastnessVSAvoiddye mixture formulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies composite materials by formulating specialized dye mixtures containing dyes from formulae 1-5 that work synergistically to provide exceptional dry-heat and sublimation fastness on polyester-elastane and polyester-spandex blends. The composite dye system maintains colorfastness under high-temperature processing conditions where conventional dyes fail

Inventive Principle:

Principle #40Composite materials

Data Source

PatentEP3421550B1High wet fast disperse dye mixtures

Publication Date: 2026.03.18 DYSTAR COLOURS DISTRIBUTION GMBH

AI summary

Dye mixtures based ondye(s) of formula (1) and dye(s) of formula (2) formula (3) formula (4) formula (5a) and/or formula (5b)