Disperse Azo Dye Mixture for Build-Up and Wash-Fastness on Polyester

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Solution Overview

Problem

Disperse-azo-dyes with certain substitution patterns exhibit 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 formulas (1) and (2), where certain substituents and provisos ensure improved build-up and fastness properties, particularly on polyester and polyester-elastane/polyester-spandex fabrics.

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 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 of different chemical structures with complementary properties resolves the contradiction by achieving both good build-up properties and excellent wash- and contact-fastness simultaneously, which neither structure could achieve alone.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite dye system consisting of multiple dye compounds with different molecular structures and properties. By formulating a mixture of dyes according to formulas (1) and (2) with specific substituent patterns, the patent achieves synergistic effects that improve both build-up characteristics and fastness properties beyond what single dyes can provide.

Inventive Principle:

Principle #40Composite materials

2Productivity

If single dyes or simple mixtures are used, then formulation is simple, but build-up properties for deeper shades are insufficient

Engineering Contradiction:

Improvebuild-up propertiesVSAvoiddye mixture complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent applies local quality by assigning specific substituent patterns to specific positions in the dye molecules. Formula (1) dyes have 2,4,5-substitution with particular groups at each position, while formula (2) dyes have different substitution patterns. This localized optimization of molecular structure at different positions creates dyes with tailored properties that work synergistically in mixture for superior build-up characteristics.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11560480B2High 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: 2023.01.24 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.