Organic C1-C6 Alkoxy-Silane Hair Dyeing for Washfastness
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Solution Overview
Problem
Existing hair coloring methods using alkoxysilanes for rapid coating on keratin materials face challenges in achieving optimal color intensity and washfastness, especially with short application times.
Innovation Solution
A two-step process involving a composition (A) containing organic C1-C6 alkoxysilanes and a colorant compound, followed by a composition (B) with an alkalizing agent and 45.0 to 97.0 wt.% water, is applied to keratin materials to enhance color intensity and fastness properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If alkoxysilanes are used for rapid coating on keratin materials, then coating speed is improved, but color intensity and washfastness deteriorate
Solution Approach 1:
The hair coloring process is divided into two separate compositions: Composition (A) containing alkoxysilanes and colorants for rapid application, and Composition (B) containing alkalizing agents for subsequent treatment. This segmentation allows each composition to perform its specific function optimally - Composition (A) provides fast coating while Composition (B) enhances color intensity and washfastness through alkaline-induced silane hydrolysis and condensation.
Solution Approach 2:
Composition (A) is applied first to deposit the colorants and alkoxysilanes on the hair surface before the alkalizing action of Composition (B) is introduced. This preliminary deposition allows the colorants to be positioned on the hair surface, and subsequent alkaline treatment triggers hydrolysis and condensation of silanes to form crosslinked networks that lock in the color, thereby improving both color intensity and washfastness.
Solution Approach 3:
The invention changes the pH parameter by introducing Composition (B) containing alkalizing agents (pH 9-12) after applying Composition (A). This pH change triggers the hydrolysis of alkoxysilane groups and subsequent condensation reactions, forming crosslinked silane networks that significantly improve color fastness and intensity while maintaining the rapid application benefit of the original alkoxysilane system.
2Loss of time
If short application times are used, then user convenience is improved, but color intensity deteriorates
Solution Approach 1:
Composition (A) is applied first to deposit the colorants and alkoxysilanes on the hair surface in a short time (1-10 minutes). This preliminary deposition step is sufficient to position the colorants, and the subsequent alkaline treatment of Composition (B) triggers rapid hydrolysis and condensation reactions that intensify the color and improve fastness, achieving good color intensity without requiring long application times.
Solution Approach 2:
The invention uses pH change (adding alkalizing agents in Composition (B)) to trigger rapid chemical reactions (hydrolysis and condensation of silanes) that enhance color intensity and fastness. This parameter change allows the color development and fixation to occur quickly after application, maintaining short application times while achieving good color intensity and washfastness.
3Loss of time
If short application times are used, then user convenience is improved, but washfastness deteriorates
Solution Approach 1:
Composition (A) is applied first to deposit the colorants and alkoxysilanes on the hair surface in a short time (1-10 minutes). This preliminary deposition step is sufficient to position the colorants, and the subsequent alkaline treatment of Composition (B) triggers rapid hydrolysis and condensation reactions that form crosslinked silane networks, locking the colorants in place and providing excellent washfastness despite the short application time.
Solution Approach 2:
The invention uses pH change (adding alkalizing agents in Composition (B)) to trigger rapid hydrolysis and condensation of alkoxysilanes, forming crosslinked networks that provide excellent washfastness. This parameter change allows the crosslinking reaction to occur quickly after application, achieving good washfastness without requiring long application times.
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 process significantly improves color intensity and washfastness of hair colorations, providing durable and long-lasting results even with short application times.
Implementation Method 1
These alkoxysilanes hydrolyze rapidly in the presence of water and form hydrolysis products and/or condensation products
Implementation Method 2
the fully formed pigments diffuse from the dyeing agent into the hair fiber
Implementation Method 3
composition (B) comprises at least one alkalizing agent (B1) and 45.0 to 97.0 wt. % water
Data Source
AI summary
The invention relates to a method for dyeing keratin material, in particular human hair, according to which the following are used on the keratin material: a first composition (A) which contains: (A1) one or more organic C1-C6-alkoxy-silanes and/or condensation products thereof, and (A2) at least one dyeing compound from the group of pigments and the direct dyes, and a second composition (B) which contains (1B) at least one alkalising agent.