Hair Dye Stability via Segmented Alkoxy Silane System
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Solution Overview
Problem
Existing hair dye technologies using oxidative dyes result in unpleasant odors and hair damage, and the high reactivity of alkoxy silanes in hair dye systems leads to uneven color application and reduced wash fastness due to rapid polymerization.
Innovation Solution
A method involving two compositions, a low-water alkoxy silane blend and a water-containing emulsion with a coloring compound, which are stored separately and mixed before application to optimize reactivity and polymerization rate for uniform hair dyeing while maintaining wash fastness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If alkoxy silanes are used in hair dye systems, then polymerization occurs rapidly, but this leads to uneven color application and reduced wash fastness
Solution Approach 1:
The patent divides the hair dye system into two separate compositions: Composition (A) containing alkoxy silanes in a low-water medium, and Composition (B) containing water and coloring compounds. These compositions are applied separately and then combined, allowing control over the polymerization timing and location to achieve uniform color application while maintaining wash fastness.
Solution Approach 2:
The patent performs preliminary separation of the alkoxy silane-containing composition from the water-containing composition before application. This preliminary action allows the alkoxy silanes to remain stable during storage and transport, and enables controlled polymerization to occur only after both compositions are combined and applied to the hair, ensuring uniform color distribution.
2Duration of action of stationary object
If oxidative dyes are used for permanent dyeing, then long-lasting color is achieved, but unpleasant odor and hair damage occur
Solution Approach 1:
The patent changes the water content parameter in Composition (A) to less than 10% to stabilize the alkoxy silanes and control their reactivity. This parameter change allows the system to achieve long-lasting color through controlled polymerization while reducing the harmful effects associated with traditional oxidative dyes, such as odor and hair damage.
3Stability of the object's composition
If alkoxy silanes are stored in high-water content, then stability is improved, but reactivity is reduced leading to poor dyeing performance
Solution Approach 1:
The patent segments the storage and application process into two stages: during storage, Composition (A) is kept in a low-water environment to maintain alkoxy silane stability; during application, Composition (A) is combined with Composition (B) containing water, which triggers controlled polymerization and reactive dyeing performance.
Solution Approach 2:
The patent uses water as an intermediary that is added during the application stage to trigger polymerization of the alkoxy silanes. This intermediary approach allows the system to maintain stability during storage while achieving high reactivity during application, resolving the contradiction between stability and productivity.
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 achieves uniform and long-lasting hair color with improved wash fastness by adapting the reactivity of alkoxy silanes to application conditions, reducing hair damage and odor, and allowing for more complex dyeing techniques like highlighting.
Implementation Method 1
the high reactivity of alkoxy silanes in hair dye systems leads to uneven color application and reduced wash fastness due to rapid polymerization
Implementation Method 2
The first composition (A) is a low-water preparation containing at least one organic C1-C6 alkoxysilane
Data Source
AI summary
It is an object of the present disclosure to provide a method for the preparation and use of an agent for coloring keratinous material, in particular human hair, comprising the following steps:(1) Preparation of a first composition (A) comprising(A1) less than about 10% by weight of water and(A2) one or more organic C1-C6 alkoxy silanes and/or condensation products thereof, and(2) Preparation of a second composition (B) containing(B1) Water and(B2) one or more fat components and(B3) one or more colorant compounds selected from the group of pigments and/or direct dyes,(3) Storage of the composition (A) and/or (B) for a period of at least about 24 hours,(4) mixing compositions (A) and (B),(5) Application of the mixture of (A) and (B) on the keratinic material.