Amino Silicone Oxidation Dye Composition for Persistent Hair Color

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Solution Overview

Problem

Existing hair dye compositions using oxidation dye precursors and couplers often result in unsatisfactory dyeing power, limited color range, poor persistence, and selective color distribution along the hair shaft, particularly at the root and end.

Innovation Solution

A composition comprising hydroxyethyl-3,4-methylenedioxyaniline, 2-amino-5-ethylphenol, and a (poly)oxyalkylenated amino silicone, along with optional additional couplers and oxidation bases, to achieve intense, uniform, and persistent hair color with improved gray hair coverage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional oxidation dye precursors and couplers are used, then a wide range of colors can be obtained, but the dyeing power is weak and color persistence is poor

Engineering Contradiction:

Improverange of colorsVSAvoiddyeing power and color persistence

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the chemical structure of the coupler by introducing specific substituents (hydroxyethyl-3,4-methylenedioxyaniline and 2-amino-5-ethylphenol) to enhance reactivity and color intensity while maintaining the oxidative coupling mechanism. This structural parameter change resolves the contradiction by improving dyeing power without limiting color range

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention combines multiple dye precursors and couplers in specific compositions to create a synergistic effect. The composite formulation includes oxidation bases, couplers with specific structures, and optional additives that work together to achieve both intense color and good persistence across a wide color spectrum

Inventive Principle:

Principle #40Composite materials

2Manufacturing precision

If oxidation dye compositions are applied to keratin fibers, then color can be achieved, but selective coloring occurs with greater difference along the fiber length

Engineering Contradiction:

Improvecolor uniformityVSAvoidselective coloring effect

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent addresses selective coloring by formulating a composition that accounts for different sensitization levels along the fiber. The specific coupler structure and oxidation base combination ensures uniform color development from root to end, eliminating the selective coloring effect while maintaining ease of application

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If dye compositions are stored, then they remain stable, but dyeing performance decreases after a period of storage

Engineering Contradiction:

Improvestorage stabilityVSAvoiddyeing performance

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent employs preliminary protective measures by including stabilizers and antioxidants in the composition formulation. These additives prevent premature oxidation and degradation of the dye precursors during storage, ensuring that full dyeing performance is maintained from the first application after storage

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention optimizes the pH range and chemical stability parameters of the composition to prevent premature reaction between oxidation bases and couplers. By controlling these parameters, the formulation maintains stability during storage while ensuring reactive performance when applied

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 chromatic, powerful, and sparingly selective colorings with good coverage and a wide range of shades, ensuring uniform color distribution and improved persistence against external agents.

Implementation Method 1

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

Methodology Applied

Scientific EffectOxidative condensation: Oxidation

Implementation Method 2

at least one oxidation coupler chosen from: (i) hydroxyethyl-3,4-methylenedioxyaniline of formula (I)... (ii) 2-amino-5-ethylphenol of formula (II)... at least one oxidation base

Methodology Applied

Scientific EffectOxidation: Oxidation

Data Source

PatentUS12558301B2Composition comprising a particular oxidation dye precursor and a particular amino silicone

Publication Date: 2026.02.24 LOREAL SA

AI summary

The invention relates to a composition comprising at least one oxidation coupler chosen from hydroxyethyl-3,4-methylenedioxyaniline of formula (I), 2-amino-5-ethylphenol of formula (II), an addition salt thereof, solvates thereof and/or solvates of the salts thereof, at least one oxidation base and at least one (poly)oxyalkylenated amino silicone.The invention also relates to a process for dyeing keratin fibers, preferably the hair, which comprises the application of the composition to said keratin fibers.