Cream Hair Coloring Agent Viscosity and pH Control
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Solution Overview
Problem
Existing oxidative hair dyes require a mixture of multiple precursors and often include partially-oxidizing dyes to achieve natural-looking colors, and they typically have a high alkali pH value for stability and reaction acceleration, which can be challenging to manage for consistent results.
Innovation Solution
A cream-like oxidative hair coloring agent comprising water, oxidation dye precursors, an alkalizing agent, crosslinked copolymers, linear alcohols, glyceryl fatty acid esters, and ethoxylated alcohols, without oxidants, that is mixed with hydrogen peroxide before application to achieve the desired color and consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a mixture of multiple oxidative dye precursors and partially-oxidizing dyes is used to achieve natural-looking colors, then color variety and natural appearance are improved, but the complexity of the formulation and application process increases
Solution Approach 1:
The patent combines multiple oxidative dye precursors (couplers and developers) into a single cream-type composition that is pre-mixed with an alkalizing agent. This merging of components into one applyable formulation simplifies the manufacturing process and reduces the number of separate substances the user must handle, while still achieving natural-looking colors through the synergistic interaction of the combined precursors
Solution Approach 2:
The patent segments the hair coloring system into two separate parts: an alkaline-resistant cream-type composition containing the dye precursors and alkalizing agent, and a separate oxidizing agent (hydrogen peroxide). This segmentation allows the precursors to be stabilized in an alkaline environment during storage, then activated only when mixed with oxidant at the time of application, simplifying both manufacturing and use
2Reliability
If an alkali pH value is used to stabilize dye precursors and accelerate oxidative reaction, then color fastness and reaction speed are improved, but the formulation becomes more challenging to manage for consistent results
Solution Approach 1:
The patent incorporates the alkalizing agent into the cream-type composition during manufacturing, performing the pH adjustment action in advance. This preliminary alkalization stabilizes the dye precursors and prepares the formulation for consistent oxidative reaction, eliminating the need for users to manually adjust pH and ensuring reliable color fastness and application consistency
Solution Approach 2:
The patent changes the pH parameter of the formulation by incorporating alkalizing agents (such as ammonia or alkanolamines) to achieve an alkaline pH value. This parameter change stabilizes the dye precursors during storage and accelerates the oxidative reaction during application, improving both color fastness and reaction speed while maintaining ease of use through pre-formulated consistency
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 solution provides a consistently high viscosity and rich, creamy consistency for better hair dye application, optimizing color fastness and reducing the need for multiple precursors, while maintaining a stable pH for improved dyeing performance.
Implementation Method 1
at least one crosslinked copolymer including acrylic acid and non-ethoxylated esters of acrylic acid with linear C10-C30-monoalcohols as monomers, at least one linear, saturated 1-alkanol with a hydroxy group and from about 8 to about 22 carbon atoms
Implementation Method 2
The developer components join together or couple with one or more coupler components to form, under the influence of oxidants or atmospheric oxygen, the actual dyes per se
Implementation Method 3
Most of the oxidative dyes used for stabilizing the dye precursors during storage and to accelerate the reaction during oxidative application have an alkali pH value, which is set with alkalizing agents such as alkanolamines, ammonia or inorganic bases
Data Source
AI summary
The subject of the present disclosure is agents for oxidative hair dyeing containing from about 65-about 83 wt. % water, oxidation dye precursor(s), alkalizing agent and a specific mixture of a crosslinked copolymer of acrylic acid and non-ethoxylated esters of acrylic acid with linear C10-C30-monoalcohols, glyceryl fatty acid esters, selected from fatty alcohol ethoxylated and linear, saturated C8-C22-alkan-1-ol, wherein the dye obtains the optimal viscosity for application and the consistency of a gel-like cream with outstanding haptics.