Hair Dye Composition Using 6-Hydroxybenzomorpholine Coupler

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Solution Overview

Problem

Existing hair dye compositions using oxidation dye precursors often result in unsatisfactory dyeing power, limited color range, poor persistence against external agents, and excessive selectivity along the hair fiber.

Innovation Solution

A composition combining 6-hydroxybenzomorpholine or its salts with oxidation bases and etidronic acid or 2,6-dipicolinic acid, which are applied to keratin fibers to achieve intense, uniform, and long-lasting color with good grey hair coverage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional oxidation dye precursors are used, then the dyeing process is simple, but the dyeing power is insufficient and color range is limited

Engineering Contradiction:

Improvecolor rangeVSAvoidcomposition complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple oxidation dye precursors (ortho- and para-phenylenediamines, aminophenols, heterocyclic compounds) with specific couplers and metal complexes to create a synergistic system that expands color range while maintaining manageable composition through structured classification of components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention uses composite dyeing compositions integrating multiple organic dye precursors with metal complexes (copper, zinc, iron) and couplers to achieve enhanced color variety and performance that cannot be obtained with single-component systems

Inventive Principle:

Principle #40Composite materials

2Reliability

If conventional dyeing compositions are used, then the formulation is simple, but the color persistence against external agents is poor

Engineering Contradiction:

Improvecolor fastnessVSAvoidcomposition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent introduces metal complexes as intermediary agents that facilitate the oxidation process and form stable color complexes with keratin, while couplers act as intermediaries to bridge dye precursors and achieve persistent coloration resistant to fading

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention employs metal-based oxidizing systems that accelerate the oxidation of dye precursors to quinone intermediates, enabling more efficient and persistent color formation that resists degradation by external agents like light and shampoo

Inventive Principle:

Principle #38Strong oxidants (Accelerated oxidation)

3Manufacturing precision

If conventional dyeing compositions are used, then the application is straightforward, but the selectivity along the hair fiber is excessive causing non-uniform coloring

Engineering Contradiction:

Improvecolor uniformityVSAvoidapplication simplicity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent employs dye precursors and couplers with different reactivity characteristics that selectively deposit at different locations along the hair fiber, with oxidation rates that vary locally to achieve uniform coloration despite differences in hair porosity and sensitization between root and end

Inventive Principle:

Principle #3Local quality

4Productivity

If conventional oxidation bases are used, then the cost is low, but the dyeing power and grey hair coverage are insufficient

Engineering Contradiction:

Improvedyeing powerVSAvoidamount of dye required

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

The invention optimizes the concentration ratios and chemical parameters of multiple dye precursors, couplers, and metal complexes to enhance oxidation efficiency and dyeing power, achieving better grey hair coverage with controlled amounts of active substances

Inventive Principle:

Principle #35Parameter changes

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 intense, uniform color with improved fastness and excellent grey hair coverage, maintaining performance even after storage.

Implementation Method 1

These oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can give rise to coloured compounds via a process of oxidative condensation

Methodology Applied

Scientific EffectOxidative condensation: Oxidation

Implementation Method 2

a chemical oxidizing agent; and at least one oxidation base

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS20250025398A1Composition comprising a particular oxidation dye precursor and two particular acids

Publication Date: 2025.01.23 LOREAL SA

AI summary

The invention relates to a composition comprising at least one oxidation coupler chosen from 6-hydroxybenzomorpholine of formula (I), one of its addition salts, its solvates and/or the solvates of its salts, and mixtures thereof, at least one oxidation base, at least one compound chosen from etidronic acid, its salts, and mixtures thereof and at least one compound chosen from 2,6-dipicolinic acid, its salts, and mixtures thereof.The invention also relates to a process for dyeing keratin fibres, preferably the hair, comprising the application of the composition to said keratin fibres.