Bleaching Agents Using Ethylene-Octene Copolymers for Oil Separation
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Solution Overview
Problem
Bleaching agents for hair lightening face challenges in stability against oil separation, miscibility with dye formulations, and achieving a suitable viscosity for application, leading to inconsistent lightening results and customer perception of quality issues.
Innovation Solution
The use of ethylene-octene copolymers and specific oil components, such as paraffin oil and peroxodisulfates, in a two-part system that forms a stable and viscous bleaching paste, improving stability and miscibility with dyes, while maintaining a suitable viscosity for application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If larger quantities of inert oil are used in paste-like bleaching agents, then the paste becomes more stable and less prone to dusting, but oil separation and settling of solid oxidizing agents occur leading to stability problems
Solution Approach 1:
A surfactant is introduced as an intermediary substance between the inert oil and solid oxidizing agents. The surfactant reduces interfacial tension and prevents oil separation, allowing the paste to maintain its homogeneous composition without requiring excessive oil quantities. This resolves the contradiction by enabling paste stability while preventing oil separation through the mediating action of the surfactant.
Solution Approach 2:
The bleaching agent is formulated as a composite system combining inert oil, solid oxidizing agents, and surfactant in specific proportions. This composite structure leverages the complementary properties of each component: the oil provides paste consistency, the oxidizing agents deliver bleaching function, and the surfactant ensures homogeneous distribution and prevents separation. The composite formulation achieves both ease of manufacture and compositional stability.
2Stability of the object's composition
If the viscosity of the bleaching paste is increased to minimize oil separation, then stability improves, but the paste becomes difficult to mix with liquid oxidizing agent preparation
Solution Approach 1:
The surfactant acts as a lubricating intermediary that reduces friction and interfacial resistance between the paste and liquid oxidizing agent preparation. This allows the paste to maintain higher viscosity for stability while still mixing easily with the liquid component, as the surfactant facilitates smooth incorporation without requiring excessive shear force.
Solution Approach 2:
The viscosity parameter of the paste is optimized to a specific range that balances stability and mixability. By controlling the viscosity within this optimal range and combining it with surfactant addition, the paste maintains sufficient thickness to resist oil separation while remaining fluid enough to mix readily with liquid oxidizing agent preparations.
3Ease of operation
If the viscosity of the bleaching paste is increased to prevent dripping, then application control improves, but the paste becomes difficult to apply uniformly
Solution Approach 1:
The viscosity parameter is precisely controlled within an optimal range that provides sufficient thickness to prevent dripping while maintaining fluidity for uniform application. This viscosity optimization, combined with surfactant addition, ensures the paste has the right balance of body and flow characteristics for consistent, drip-free application.
Solution Approach 2:
The surfactant serves as a flow-modifying intermediary that enhances the paste's spreadability and uniformity during application. It reduces internal friction and improves wetting characteristics, allowing the paste to be applied evenly across the substrate while the optimized viscosity prevents excessive running or dripping.
4Stability of the object's composition
If water-free bleaching agents are used to improve stability, then oil separation is reduced, but miscibility with aqueous oxidizing agent preparation becomes technically complex
Solution Approach 1:
The surfactant acts as a hydrophilic-lipophilic intermediary that bridges the water-free bleaching paste and aqueous oxidizing agent preparation. It contains both hydrophobic and hydrophilic segments that interact with each phase, facilitating mutual solubility and homogeneous mixing. This eliminates the technical complexity of miscibility while maintaining the stability benefits of water-free formulation.
Solution Approach 2:
The hydrophilic-lipophilic balance (HLB) parameter of the surfactant is optimized to match the specific composition of the water-free paste and aqueous preparation. By selecting or designing a surfactant with appropriate HLB value, the system achieves complete miscibility upon contact, transforming a potentially complex miscibility problem into a straightforward mixing process.
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 enhances the stability of bleaching agents against oil separation, improves miscibility with dye formulations, and maintains a suitable viscosity for easy application, resulting in consistent and uniform lightening results.
Implementation Method 1
ethylene-octene copolymer(s)...oil component(s)...stable and viscous bleaching paste
Implementation Method 2
polymer(s) which form oleo and/or lipogels
Implementation Method 3
oxidizing agents...lighten hair fibers by the oxidative destruction of the hair dye melanin...peroxodisulfate(s)
Implementation Method 4
stability problems (settling of the solid oxidizing agents from the oil and deposition of the oil component)...different portions of the packaging can cause different lightening
Data Source
AI summary
Bleaching agents with improved resistance to oil separation and better miscibility with dye-containing formulations comprise—in relation to their weight—from about 0.015 to about 10 wt.-% ethylene octene copolymer(s), from about 5 to about 70 wt.-% oil component(s), from about 1 to about 70 wt.-% peroxydisulfate(s) chosen from the group of sodium peroxodisulfate and/or potassium peroxodisulfate and/or ammonium peroxodisulfate, and ≥1 wt.-% free water.