Silane Hair Color Composition for Controlled Polymerization
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Solution Overview
Problem
Existing hair coloring methods using organic alkoxy silanes face challenges in achieving uniform and long-lasting color results due to rapid polymerization, which can lead to uneven application and extended application times, especially when used in whole-head treatments.
Innovation Solution
A method involving three compositions: a low-water silane blend (A) containing organic C1-C6 alkoxysilanes, a water-based composition (B) with aromatic or aliphatic aldehydes, and a coloring compound (C), where compositions (A) and (B) are combined to control the polymerization rate, allowing for uniform and rapid application on keratinous materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If organic alkoxy silanes are used for hair coloring, then rapid coating and good staining results are achieved, but polymerization occurs too rapidly causing uneven application and extended application times
Solution Approach 1:
The patent divides the single composition into two separate compositions: (A) containing organic alkoxy silanes and (B) containing water and aldehyde. This segmentation allows the reactive silane components to be stored separately from water, preventing premature polymerization, while enabling controlled reaction upon mixing for uniform application
Solution Approach 2:
The patent prepares composition (A) with organic alkoxy silanes in advance without water, maintaining stability and reactivity. The water-containing composition (B) is prepared separately. Both compositions are ready for application, but the actual polymerization reaction is delayed until mixing occurs on the hair, ensuring uniform distribution before coating formation
2Ease of manufacture
If organic alkoxy silanes are stored in aqueous media, then easy formulation is achieved, but reactivity is lost making durable coating formation impossible
Solution Approach 1:
The patent segments the formulation into water-free composition (A) containing organic alkoxy silanes and water-containing composition (B). This separation maintains silane reactivity in composition (A) while enabling easy aqueous formulation in composition (B), with both components ready for controlled mixing during application
Solution Approach 2:
The patent uses aldehyde in composition (B) as an intermediary that controls the polymerization reaction. The aldehyde mediates between the organic alkoxy silanes and water, enabling durable coating formation by controlling the reaction rate and preventing uncontrolled polymerization that would occur with direct water contact
3Ease of operation
If water content in silane preparation is increased, then application ease is improved, but polymerization rate increases causing thickening or gelation
Solution Approach 1:
The patent divides the system into two separate compositions: (A) with less than 10 wt% water containing organic alkoxy silanes, and (B) with water and aldehyde. This segmentation allows composition (A) to remain stable and easy to apply, while the water in composition (B) is controlled to prevent premature polymerization
Solution Approach 2:
The patent controls the water content parameter in composition (A) to be less than 10 wt%, which maintains preparation stability and prevents gelation. The low water content ensures the organic alkoxy silanes remain stable during storage and application, while still allowing sufficient reactivity when mixed with composition (B)
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
This approach enables uniform, long-lasting coloration with high rub fastness and wash fastness on keratinous materials, particularly human hair, by optimizing the polymerization rate for whole-head treatments without prolonging application time.
Implementation Method 1
These alkoxy silanes hydrolyze rapidly in the presence of water, forming hydrolysis products and/or condensation products
Implementation Method 2
The polymerization that occurs when alkoxy silanes are stored in aqueous media manifests as thickening or gelation of the aqueous preparation
Data Source
AI summary
The invention relates to a method for treating keratin material, in particular human hair, according to which the following are used on the keratin material - a first composition (A), which contains, in relation to the total weight of composition (A), (A1) less than 10 wt.% water and (A2) one or more organic C1-C6 alkoxy-silanes and/or the condensation products thereof, and a second composition (B), which contains (B1) water and (B2) one or more aromatic or aliphatic aldehydes with 2 - 20 carbon atoms.