Dye Composition Using 12-Hydroxystearic Acid for Hair Dyeing

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Solution Overview

Problem

Existing hair dye compositions, particularly direct dyes, suffer from poor stability, ease of application, and rinsability, leading to weak dyeing power and poor persistence against washing or perspiration.

Innovation Solution

A dye composition comprising 12-hydroxystearic acid, one or more organic amines, and one or more dyes, which improves stability, ease of application, and rinsability, and can be used alone or with an oxidizing composition for effective hair dyeing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If direct dyes are used for semi-permanent dyeing, then the dyeing process is simple and quick, but the dyeing power is weak and persistence against washing or perspiration is poor

Engineering Contradiction:

Improvedyeing process speedVSAvoiddyeing persistence

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent combines direct dyes with 12-hydroxystearic acid and organic amines to create a composite dyeing composition. This composite formulation allows the dye to penetrate deeper into the hair fiber while maintaining ease of application, thus improving both productivity and reliability simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the chemical parameters of the dyeing composition by incorporating 12-hydroxystearic acid and organic amines, which change the penetration and binding characteristics of the dye. This enables the dye to achieve stronger adhesion to hair fibers while preserving the simplicity of the dyeing process.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If oxidation dyeing is performed to improve dyeing persistence, then the dyeing power and persistence are enhanced, but the process complexity increases

Engineering Contradiction:

Improvedyeing persistenceVSAvoiddyeing process complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the benefits of direct dyeing (simplicity) and oxidation dyeing (persistence) by combining direct dyes with 12-hydroxystearic acid and organic amines. This unified composition achieves deep penetration and strong adhesion without requiring separate oxidation steps, thus enhancing reliability while maintaining process simplicity.

Inventive Principle:

Principle #5Merging (Combining)

3Stability of the object's composition

If dye compositions are made more viscous for better stability, then storage stability improves, but ease of application and spreading decreases

Engineering Contradiction:

Improvestorage stabilityVSAvoidease of application

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The patent optimizes the rheological parameters of the dye composition by incorporating 12-hydroxystearic acid, which provides thermal thickening behavior. This allows the composition to maintain appropriate viscosity for easy application at room temperature while exhibiting improved stability under storage conditions, including heat exposure.

Inventive Principle:

Principle #35Parameter changes

4Ease of operation

If more water is used for rinsing to remove all dye composition, then complete rinsing is achieved, but water consumption increases

Engineering Contradiction:

ImproverinsabilityVSAvoidwater consumption

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The patent extracts or removes the need for excessive rinsing water by formulating the dye composition with 12-hydroxystearic acid and organic amines that create easily rinseable deposits. The dye penetrates deeply during application but can be completely removed with minimal rinsing water, thus improving rinsability while reducing water consumption.

Inventive Principle:

Principle #2Taking out (Extraction)

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 composition provides a stable, easy-to-apply, and easy-to-rinse hair dye with enhanced dyeing intensity and selectivity, reducing water consumption and maintaining performance over time.

Implementation Method 1

a dye composition comprising 12-hydroxystearic acid, at least one organic amine and at least one dye

Methodology Applied

Scientific EffectComplex formation: Chemical Bonding

Implementation Method 2

at least one organic amine and at least one dye as defined below, used in a dyeing process

Methodology Applied

Scientific EffectBase-catalyzed penetration: Chemical Bonding

Implementation Method 3

direct dyes, which are coloured and colouring molecules that have affinity for said fibres

Methodology Applied

Scientific EffectAffinity binding: Adsorption

Implementation Method 4

when combined with oxidizing products, may give rise to coloured compounds via a process of oxidative condensation

Methodology Applied

Scientific EffectOxidative condensation: Oxidation

Data Source

PatentEP3544576B1Dye composition comprising 12-hydroxystearic acid, an organic amine and a dye

Publication Date: 2021.08.18 LOREAL SA

AI summary

Dye composition comprising 12-hydroxystearic acid, an organic amine and a dye The invention relates to a dye composition comprising 12-hydroxystearic acid, one or more organic amines and one or more dyes chosen from oxidation dyes and direct dyes. The invention also relates to a dyeing process using said dye composition.