Styryl Imine Dye Thiol Composition Hair Coloring

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Solution Overview

Problem

Current hair coloring methods using oxidation dye precursors or direct dyes often result in temporary or semi-permanent colors, require oxidizing agents that degrade hair, and can be messy, with limited ability to achieve chromatic and tenacious shades on dark hair without staining.

Innovation Solution

A composition comprising styrylic or iminic dyes and thiolated compounds, which are initially colorless or weakly colored, revealing color upon application to hair through heterocycle opening triggered by stimuli, allowing for chromatic and tenacious coloring without the need for oxidizing agents and minimizing mess.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oxidation dye precursors are used to color hair, then the color can be visible on dark hair and has good tenacity, but the composition is colored during application causing mess and requires oxidizing agents that degrade hair

Engineering Contradiction:

Improvecolor tenacityVSAvoidhair degradation from oxidizing agents

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent changes the chemical state of the dye from oxidized (colored) to reduced (colorless) form in the composition, and uses reducing agents instead of oxidizing agents to achieve color development, thereby avoiding hair degradation while maintaining coloring effectiveness

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces reducing agents as intermediaries that enable colorless dyes to be converted to colored forms on the hair, replacing the harmful role of oxidizing agents while achieving the same coloring function without damage

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If direct dyes are used to achieve chromatic colors, then very chromatic colors can be obtained, but the coloring is temporary or semi-permanent with limited tenacity

Engineering Contradiction:

Improvechromatic intensityVSAvoidcolor tenacity

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent combines colorless styrylic or iminic dyes with reducing agents to create a composite coloring system that achieves both strong chromatic intensity and permanent tenacity, overcoming the limitations of direct dyes alone

Inventive Principle:

Principle #40Composite materials

3Reliability

If oxidation coloring is used to achieve permanent color, then good tenacity is obtained, but the composition becomes colored during application making it messy

Engineering Contradiction:

Improvecolor tenacityVSAvoidapplication cleanliness

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the oxidation state of the dye from oxidized (colored) to reduced (colorless) form, allowing the composition to remain colorless during application and only develop color after application, thereby eliminating the messiness while maintaining permanent tenacity

Inventive Principle:

Principle #35Parameter changes

4Illumination intensity

If oxidizing agents are used to lighten hair, then lighter tones can be achieved, but the hair fiber undergoes degradation over time

Engineering Contradiction:

Improvehair lighteningVSAvoidhair fiber degradation

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces reducing agents as intermediaries to achieve hair lightening without the harmful effects of oxidizing agents, replacing the chemical mechanism while maintaining the lightening function and preserving hair fiber integrity

Inventive Principle:

Principle #24Intermediary (Mediator)

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 clean, long-lasting chromatic hair coloring process that can lighten dark hair tones without oxidizing agents, ensuring the color is revealed only after application, thus avoiding hair degradation and mess.

Implementation Method 1

the color is revealed by opening the heterocycle to produce the following species of formula (I'), which are colored

Methodology Applied

Scientific EffectHeterocycle opening: Chemical Bonding

Data Source

PatentEP2083923B1Composition comprising a dye of styryl or imine type and a thiol compound, dyeing process and device

Publication Date: 2010.05.05 LOREAL SA

AI summary

The present invention relates to compositions for dyeing keratin fibres, and in particular human keratin fibres such as the hair, comprising at least one compound of styryl or imine type comprising a heterocycle and at least one thiol compound. The invention also relates to a process for dyeing keratin fibres, consisting in applying said composition and in revealing the colour through the action of a revealing agent. The present invention makes it possible in particular to obtain a chromatic and fast coloration of the keratin fibres, in particular with respect to shampooing. Furthermore, the coloration obtained is visible even on dark hair, without the need to use an oxidizing composition. The invention also makes it possible to obtain a coloration which, under certain conditions, does not stain.