Solid-Stabilized Hair Dye Emulsion for Uniform Coloring
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Solution Overview
Problem
Existing hair dye emulsions, particularly oxidative hair dyes, face challenges in maintaining stability and uniformity when mixed, often resulting in variegated coloring due to viscosity issues and separation of components, especially when high dye amounts are used.
Innovation Solution
A dyeing agent in the form of an oil-in-water emulsion stabilized with finely divided particles, allowing for easy mixing with an oxidizing agent preparation, maintaining viscosity and stability even after prolonged storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high dye amounts are used in hair dye emulsions, then color intensity is improved, but emulsion stability deteriorates causing separation and variegated coloring
Solution Approach 1:
The patent changes the physical-chemical parameters of the emulsion system by introducing finely divided particles with specific surface properties. These particles modify the interfacial characteristics between oil and water phases, enabling the emulsion to stabilize even with high dye concentrations that would normally cause phase separation.
Solution Approach 2:
The invention creates a composite emulsion system by combining traditional oil-in-water emulsion components with finely divided solid particles. This composite structure forms a Pickering emulsion where the solid particles act as structural elements at the interface, providing enhanced stability while accommodating high dye loads.
2Stability of the object's composition
If conventional emulsifiers are used to stabilize the emulsion, then emulsion formation is improved, but surfactant concentration increases causing potential skin irritation
Solution Approach 1:
The patent fundamentally changes the stabilization mechanism from chemical (surfactant-based) to physical (particle-based). By using finely divided particles with appropriate surface characteristics, the emulsion achieves stability without requiring high concentrations of potentially irritating surfactants, thus reducing harmful effects on skin.
Solution Approach 2:
The invention replaces expensive and potentially harmful surfactant systems with inexpensive, inert finely divided particles. These particles provide stable emulsion formation without the biological activity that causes skin irritation, offering a safer alternative for cosmetic applications.
3Stability of the object's composition
If the emulsion viscosity is increased to prevent separation, then emulsion stability is improved, but ease of mixing with oxidizing agent deteriorates
Solution Approach 1:
The patent optimizes the particle size parameter of the finely divided solids to achieve a balance between stability and processability. The particles are small enough to not significantly increase viscosity or hinder mixing, yet sufficient in number and surface area to provide effective steric stabilization against phase separation.
4Stability of the object's composition
If finely divided particles are added to stabilize the emulsion, then emulsion stability is improved, but device complexity increases
Solution Approach 1:
The invention uses simple, commercially available finely divided particles (such as metal oxides or silicates) that can be readily incorporated into existing emulsion formulations. These inexpensive particles provide effective stabilization without requiring complex formulation procedures or specialized manufacturing equipment.
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
Ensures a homogeneous and stable application mixture with improved color uniformity, even with high dye contents, by using finely divided particles to stabilize the emulsion and adjust viscosity effectively.
Implementation Method 1
solid-stabilized emulsions or Pickering emulsions... small particles that are wetted better by water than by oil can stabilize O/W emulsions... a mechanically stable solid film can form around the dispersed phase
Implementation Method 2
Emulsifiers reduce the interfacial tension between the phases by forming interfacial films at the phase boundary between oil and water
Implementation Method 3
solid particles arrange themselves at the interface between the two phases (hydrophilic and lipophilic phase) and prevent the droplets of the dispersed internal phase from coalescing
Data Source
AI summary
A dyeing agent (A) for dyeing keratinic fibers, in particular human hair, which is present in the form of an oil-in-water emulsion (O/W emulsion), includes(a1) an oil phase, including one or more fatty components (F),(a2) an aqueous phase,(a3) at least one oxidation dye precursor (ODP) and/or at least one direct dye (D), and(a4) at least one type of finely divided particles (P) that have an average particle size of less than 200 μm.A multi-component packaging unit includes the aforementioned dyeing agent (A) and a separately packaged oxidizing agent preparation (B).