Chromatic UV-Blocking Emulsion With Refractive Index Matching
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Solution Overview
Problem
Conventional ultraviolet-blocking cosmetic compositions exhibit an opaque appearance and lack a stable chromatic emulsion state, which is transparent and expresses structural color, due to the use of organic ultraviolet-blocking agents with high refractive indices and inorganic agents as opaque powders.
Innovation Solution
A cosmetic composition is formulated with an organic ultraviolet-blocking agent and a silicone-based surfactant, where polyethylene glycol-added dimethicone and polypropylene glycol are cross-linked, to achieve a stable chromatic emulsion state by matching the refractive indices of the oil and aqueous phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic ultraviolet-blocking agents with high refractive index are used, then ultraviolet-blocking efficacy is improved, but the composition becomes opaque and loses transparency
Solution Approach 1:
The patent changes the refractive index parameter of the ultraviolet-blocking agent from high (conventional organic agents) to low (PEG-15/lauryldimethicone crosspolymer with refractive index 1.43-1.47), enabling transparency while maintaining UV-blocking efficacy. This parameter change resolves the contradiction between UV protection and visual transparency.
Solution Approach 2:
The patent uses a composite formulation combining PEG-15/lauryldimethicone crosspolymer with specific oils (refractive index 1.44-1.46) and aqueous phase (refractive index 1.33-1.35), creating a multi-phase system where refractive index matching between phases produces transparency while the composite provides UV protection.
2Reliability
If inorganic ultraviolet-blocking agents are used, then ultraviolet-blocking efficacy is improved, but the composition becomes opaque due to powder ingredients
Solution Approach 1:
The patent extracts and eliminates inorganic powder ingredients (titanium dioxide, zinc oxide) from the formulation, replacing them with organic liquid crystalline compounds that provide equivalent UV protection without opacity. This extraction resolves the contradiction by removing the opaque component while preserving UV-blocking function.
Solution Approach 2:
The patent substitutes inorganic powder-based UV protection with an organic liquid crystalline system that uses molecular ordering and refractive index matching instead of physical scattering mechanisms, achieving transparency while maintaining protection efficacy.
3Illumination intensity
If conventional chromatic emulsion formulations are used, then transparency is improved, but stability deteriorates and structural color cannot be maintained
Solution Approach 1:
The patent optimizes the refractive index parameters of each phase (oil phase 1.44-1.46, aqueous phase 1.33-1.35, UV agent 1.43-1.47) to achieve precise matching, creating transparency while the specific parameter range maintains emulsion stability and structural color expression.
Solution Approach 2:
The patent introduces PEG-15/lauryldimethicone crosspolymer as an intermediary substance that mediates between the oil and aqueous phases, enabling refractive index matching for transparency while providing emulsification and stabilization functions to maintain composition integrity.
4Illumination intensity
If refractive index matching is achieved for transparency, then structural color expression is improved, but formulation stability deteriorates
Solution Approach 1:
The patent carefully controls the refractive index parameter within specific ranges (oil 1.44-1.46, aqueous 1.33-1.35) to enable structural color expression through light interference while preventing phase separation and maintaining formulation stability through optimized parameter matching.
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 composition maintains transparency while providing excellent ultraviolet-blocking efficacy and stability, avoiding skin irritation and oily feelings, with a refractive index difference of 0.009 or less between phases, ensuring phase stability up to 50°C.
Implementation Method 1
a chromatic emulsion refers to an emulsion that expresses a structural color due to the difference in the light dispersing ability between the aqueous and oil phases while being transparent by matching the refractive indices of the aqueous phase and the oil phase of the composition
Implementation Method 2
UV protection products include inorganic ultraviolet-blocking agents such as titanium dioxide or zinc oxide, or organic ultraviolet blocking agents such as ethylhexylmethoxycinnamate, ethylhexylsalicylate, octocrylene
Data Source
AI summary
The present invention relates to an ultraviolet blocking cosmetic composition in a chromatic emulsion state, containing a high quantity of an organic ultraviolet-blocking agent, and a silicone-based surfactant in which polyethylene glycol-added dimethicone and polypropylene glycol are cross-linked, and the cosmetic composition according to the present invention can exhibit a stable chromatic emulsion state even if containing a high quantity of the organic ultraviolet-blocking agent.