Oxidation-Resistant Hair Dye Foam via Segmented Pressurized Dispensing

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Solution Overview

Problem

Oxidation-sensitive hair dye compositions, particularly those in foam form, face challenges with stability and effectiveness in covering grey hair due to oxidation sensitivity, leading to reduced usability over time.

Innovation Solution

A process using a mixture comprising a thickening polymer, such as associative or anionic non-associative polymers, combined with oxidation dye precursors and an alkaline agent, formulated to maintain stability and effectiveness, with the composition being dispensed from a pressurized container to prevent oxidation, resulting in a foam that is easy to apply and maintains color intensity and homogeneity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If oxidation-sensitive hair dye compositions are formulated for foam form, then ease of application and user pleasure are improved, but stability over time and effectiveness in covering grey hair deteriorate due to oxidation sensitivity

Engineering Contradiction:

Improveease of applicationVSAvoidstability over time

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The hair dye product is divided into two separate compositions stored in the same pressurized container: an oxidation-sensitive composition (containing dye precursors) and an oxidation-resistant composition (containing thickening polymer and stabilizing agents). This segmentation allows each composition to maintain its optimal properties independently until use, resolving the contradiction between ease of application and stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The thickening polymer acts as an intermediary substance that forms a stable foam structure and protects the oxidation-sensitive dye precursors from premature oxidation. The polymer creates a protective matrix that maintains composition stability during storage while enabling easy foam application when the container is activated.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If compositions are conditioned in pressurized containers to prevent oxidation, then stability is improved, but coverage of grey hair and galenical quality deteriorate

Engineering Contradiction:

ImprovestabilityVSAvoidcoverage of grey hair

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The invention modifies the chemical parameters of the oxidation-resistant composition by incorporating specific thickening polymers and stabilizing agents that maintain foam structure and dye precursor stability without interfering with the dyeing performance on grey hair. The polymer concentration and molecular weight are optimized to achieve both stability and effective grey hair coverage.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If oxidation-sensitive compositions are used, then color variety and range are improved, but usability over time deteriorates due to oxidation

Engineering Contradiction:

Improvecolor varietyVSAvoidusability over time

Core Design Contradiction:

Adaptability or versatilityVSDuration of action of stationary object

Solution Approach 1:

The pressurized container creates an inert environment that prevents atmospheric oxygen from contacting the oxidation-sensitive dye precursors during storage. This inert atmosphere preservation allows the full range of oxidation-based color reactions to occur when the product is used, maintaining both color variety and extended usability.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 solution provides a stable, easy-to-apply foam that effectively covers grey hair with consistent color intensity and homogeneity, resisting external agents like shampooing and perspiration.

Implementation Method 1

Compositions which are conditioned in pressurized containers that can prevent the composition from coming into contact with air during their use

Methodology Applied

Scientific EffectOxidation prevention: Oxidation

Implementation Method 2

a process for dyeing the hair using a mixture comprising at least one thickening polymer

Methodology Applied

Scientific EffectThickening:

Implementation Method 3

oxidation bases are colourless or weakly coloured compounds which, when combined with oxidizing products, can give access to coloured entities

Methodology Applied

Scientific EffectOxidation reaction: Oxidation

Data Source

PatentEP2841047B1Dyeing process using a mixture comprising a thickening polymer, obtained from an aerosol device, and device therefor

Publication Date: 2024.08.21 LOREAL SA

AI summary

The present invention relates to a process for dyeing keratin fibres in which a mixture is applied to the fibres, this mixture being obtained from: a dye composition comprising at least one oxidation dye precursor, and an oxidizing composition comprising at least one chemical oxidizing agent, at least one of the compositions being dispensed from a pressurized container, the mixture of the two compositions comprising at least one thickening polymer chosen from: associative polymer, anionic non-associative polymer chosen from anionic polymers bearing sugar units, anionic polymers not bearing sugar units chosen from crosslinked acrylic or methacrylic acid homopolymers or copolymers, crosslinked 2-acrylamido-2-methylpropanesulfonic acid homopolymers and crosslinked acrylamide copolymers thereof, ammonium acrylate homopolymers, or copolymers of ammonium acrylate and of acrylamide, alone or mixtures thereof, and mixtures thereof; and also to a device suitable for performing this process.