Silane Hair Dye Layering for Washfast Color Without Oxidation

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Solution Overview

Problem

Existing hair dyeing methods, particularly oxidative dyes, suffer from unpleasant odors and hair damage, and the colorants used in alternative methods like pigments and direct dyes lack sufficient color intensity and wash fastness.

Innovation Solution

A two-step process involving the application of an agent containing an organic silicon compound and a colorant compound followed by a film-forming polymer to create a multilayer film system on keratin materials, ensuring permanent fixation of colorants.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oxidative dyes are used for permanent hair dyeing, then color fastness and grey coverage are improved, but unpleasant ammonia odor and hair damage occur

Engineering Contradiction:

Improvecolor fastnessVSAvoidhair damage and ammonia odor

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the harmful oxidative dyeing process while retaining the desirable color fastness property. By using a combination of direct dyes, pigments, and film-forming polymers instead of oxidative dyes, the invention eliminates ammonia odor and hair damage while achieving permanent color fixation through the film-forming polymer that resists shampooing.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a composite formulation combining direct dyes, pigments, and film-forming polymers. This composite material system achieves the color fastness previously only attainable through oxidative dyes, while avoiding their harmful effects. The film-forming polymer creates a durable matrix that traps and secures the colorants on the hair surface.

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If direct dyes or pigments are used for hair coloring, then ammonia odor and hair damage are avoided, but color intensity and wash fastness are insufficient

Engineering Contradiction:

Improveabsence of ammonia odor and hair damageVSAvoidwash fastness

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The film-forming polymer acts as an intermediary that bridges the gap between the colorants (direct dyes and pigments) and the hair surface. This polymer mediator provides the binding and fixation function that direct dyes and pigments alone cannot achieve, creating a durable film that resists shampooing while maintaining the benefits of non-oxidative coloring.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite system where film-forming polymers work synergistically with direct dyes and pigments. The polymer matrix provides structural integrity and wash fastness, while the colorants provide intensity and variety, achieving a performance level that neither component could achieve alone.

Inventive Principle:

Principle #40Composite materials

3Reliability

If pigments and film-forming polymer are applied together as taught in EP 2168633 B1, then some wash fastness is achieved, but color intensity and shampooing resistance are still insufficient

Engineering Contradiction:

Improvewash fastnessVSAvoidcolor intensity

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent optimizes the parameters of the film-forming polymer system, including selecting specific polymer types, adjusting polymer concentrations, and controlling film formation conditions. These parameter changes enhance both the color intensity and the shampooing resistance, overcoming the limitations of the previously taught formulation.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention applies different components with specific local functions: direct dyes provide intense color where needed, pigments provide coverage and depth, and the film-forming polymer provides uniform fixation and wash fastness. This local optimization of each component's properties achieves superior overall performance.

Inventive Principle:

Principle #3Local quality

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 method produces extremely washfast dyeing with improved resistance to shampooing, achieving high color intensity and wash fastness without the use of oxidative dye precursors.

Implementation Method 1

applying an agent (a) to the keratinous material, wherein the agent (a) comprises: (a1) at least one organic silicon compound selected from the group of silanes

Methodology Applied

Scientific EffectSilane film formation: Deposition (physical)

Implementation Method 2

applying an agent (b) to the keratinous material, wherein the agent (b) comprises: (b1) at least one film-forming polymer

Methodology Applied

Scientific EffectFilm formation: Deposition (physical)

Data Source

PatentUS12551426B2Method for treating hair, comprising the application of a first agent (a) having a silane and a chromophoric compound, and a second agent (b) having a film-forming polymer

Publication Date: 2026.02.17 HENKEL KGAA

AI summary

The subject of the present disclosure is a process for dyeing keratinous material, in particular human hair, comprising the following steps:Application of an agent (a) to the keratinous material, wherein the agent (a) comprises:(a1) at least one organic silicon compound selected from the group of silanes having one, two or three silicon atoms, and(a2) at least one colorant compound selected from the group of pigments and/or direct dyes, andApplication of an agent (b) to the keratinous material, wherein the agent (b) comprises:(b1) at least one film-forming polymer.