Disperse Azo Dye Mixtures for Deep Polyester Shades and Wet Fastness

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

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

Innovation Solution

A dye mixture comprising specific combinations of azo dyes with formulas (1) and (2), where R1 to R11 and X5 to X6 are defined within specific ranges, ensuring at least one of R3, R4, R5, R6, and X5, X6 are not hydrogen, and L is hydrogen or fluoro, to enhance build-up and fastness properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If disperse-azo-dyes with substitution pattern 2,4,5 in the diazo-component are used, then certain dyeing properties are achieved, but build-up properties for deeper shades are unsatisfactory and wash- and contact-fastness are insufficient

Engineering Contradiction:

Improvewash- and contact-fastnessVSAvoidbuild-up properties for deeper shades

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 pattern) into a single dye mixture. This merging allows the mixture to achieve both deep shade build-up and excellent wash/contact-fastness, resolving the contradiction between these two properties that cannot be achieved with single dyes of either structure alone.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite dye system by mixing dyes of formula (1) and formula (2) in specific ratios (1:4 to 4:1). This composite approach combines the strengths of both dye structures to achieve superior overall performance in terms of build-up, wash-fastness, and contact-fastness compared to individual dye components.

Inventive Principle:

Principle #40Composite materials

2Reliability

If single dyes of formula (1) or (2) are used, then certain fastness properties are achieved, but build-up properties for deeper shades remain insufficient

Engineering Contradiction:

Improvefastness propertiesVSAvoidbuild-up for deeper shades

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent merges dyes of formula (1) which provide good fastness properties with dyes of formula (2) which contribute to build-up capability, creating a synergistic mixture that achieves both deep shade formation and excellent fastness properties that neither component achieves alone.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention optimizes the ratio of dyes of formula (1) to formula (2) within the range of 1:4 to 4:1 to achieve the best balance between build-up properties and fastness. This parameter optimization allows the dye mixture to achieve deep shades while maintaining excellent wash and contact fastness.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS11479672B2High wet fast disperse dye mixtures of N-[4-(5-thiocyanato-2,4-dinitro-phenylazo)-phenyl]-amine derivatives and N-[4-(4-nitro-phenylazo)-phenyl]-amine derivatives

Publication Date: 2022.10.25 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.