Laundry Composition for Polyester Whiteness via Hydrophobic Dye Deposition

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Solution Overview

Problem

Current laundry treatments fail to effectively maintain the whiteness of polyester garments over time, as existing dyes and surfactants do not significantly deposit on polyester fibers, leading to a yellow hue and reduced aesthetic value.

Innovation Solution

A laundry treatment composition containing low levels of hydrophobic anthraquinone dyes and fluorescent agents, applied during the wash and rinse cycles, forms a shading medium that is substantive to polyester fibers, providing a whiteness benefit even at routine laundry temperatures, with a synergy between dyes and fluorescent agents enhancing the deposition and retention of dye on synthetic fibers like nylon and elastane.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If conventional dyes and surfactants are used in laundry treatments, then the formulation is simple and easy to manufacture, but the dye does not deposit significantly on polyester fibres, leading to reduced whiteness maintenance

Engineering Contradiction:

Improvedye deposition on polyester fibresVSAvoidformulation complexity

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent introduces a specific surfactant as an intermediary substance that facilitates dye deposition on polyester fibres. The surfactant acts as a mediator between the hydrophobic dye and the fibre surface, enabling significant deposition without complex formulation changes. This resolves the contradiction by using a simple intermediary agent rather than complicating the overall formulation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the hydrophobicity parameter of the dye by selecting specific hydrophobic dyes with appropriate log P values (2.0-6.0). This parameter change enables the dye to interact effectively with polyester fibres while maintaining formulation simplicity. The specific parameter adjustment resolves the deposition issue without requiring complex formulation modifications.

Inventive Principle:

Principle #35Parameter changes

2Quantity of substance

If high levels of coloured inorganic salts and high concentrations of dyes are used, then dye deposition on fibres is improved, but the cost and complexity of the formulation increases

Engineering Contradiction:

Improvedye deposition on polyester fibresVSAvoidamount of dye and surfactant required

Core Design Contradiction:

Quantity of substanceVSLoss of substance

Solution Approach 1:

The patent uses low concentrations of hydrophobic dye (0.0001-0.1 wt%) combined with an optimized amount of surfactant to achieve effective dye deposition. This partial action approach is sufficient to maintain whiteness without requiring excessive dye levels, thereby reducing material consumption and cost while maintaining effectiveness.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The surfactant serves as an efficient intermediary that enhances dye deposition at low dye concentrations. By using the surfactant mediator, the patent achieves effective fibre deposition with minimal dye quantity, resolving the contradiction between deposition effectiveness and material consumption.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Illumination intensity

If bleaching processes are applied to maintain whiteness, then the white appearance is restored temporarily, but over time the garment takes on a yellow hue

Engineering Contradiction:

Improvewhiteness appearanceVSAvoidduration of whiteness maintenance

Core Design Contradiction:

Illumination intensityVSDuration of action of stationary object

Solution Approach 1:

The patent applies preliminary shading action by depositing hydrophobic dye on polyester fibres before yellowing occurs. This preliminary deposition creates a protective shading layer that prevents yellow hue development over time, extending the duration of whiteness maintenance without requiring repeated bleaching treatments.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the typically harmful effect of dye deposition (which can stain fabrics) into a beneficial shading effect. By using specific hydrophobic dyes at low concentrations with surfactant assistance, the deposited dye provides a shading benefit that masks yellowing, transforming what would normally be a staining problem into a solution for long-term whiteness maintenance.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

4Stability of the object's composition

If alcohol is used as a solubilising agent for anthraquinone dyes, then the dye solubility in liquid detergent composition is improved, but the environmental impact and safety concerns increase

Engineering Contradiction:

Improvedye solubility in liquid detergentVSAvoidenvironmental impact and safety concerns

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the solubility approach by selecting hydrophobic dyes with specific log P values (2.0-6.0) that have inherent solubility characteristics suitable for liquid detergent formulations without requiring alcohol. This parameter change in dye selection eliminates the need for harmful solubilising agents while maintaining composition stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces expensive and potentially harmful alcohol-based solubilising systems with a simpler, more environmentally friendly approach using surfactant-assisted hydrophobic dyes. This substitution eliminates unnecessary chemical additives, reducing environmental impact and safety concerns while maintaining effective dye delivery.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 method effectively maintains and enhances the white appearance of polyester garments by ensuring the deposition of dyes at low concentrations, providing a shading benefit and extending the aesthetic value of the garments through multiple washes.

Implementation Method 1

hydrophobic dyes are substantive to polyester fibres under normal domestic wash conditions

Methodology Applied

Scientific EffectHydrophobic interaction: Hydrophobe

Implementation Method 2

a fluorescent agent selected from: sodium 2 (4-styryl-3-sulfophenyl)-2H-napthol[1,2-d]triazole, disodium 4,4'-bis{[(4-anilino-6-(N methyl-N-2 hydroxyethyl) amino 1,3,5-triazin-2-yl)]amino}stilbene-2-2' disulfonate

Methodology Applied

Scientific EffectFluorescence: Fluorescence