Emulsion Sunscreen Composition for Uniform UV and Blue Light Blocking
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Solution Overview
Problem
Existing cosmetic compositions fail to provide comprehensive protection against a wide range of harmful electromagnetic radiation, including UV radiation and blue light, due to the limited distribution of UV blockers in aqueous and oil phases, leading to variations in blocking efficacy and poor water resistance.
Innovation Solution
A cosmetic composition in emulsion form containing at least three UV blockers, an emulsifier, and a thickener, with specific UV blockers distributed in both the aqueous and oil phases, stabilized by a polyglyceryl-based emulsifier and inorganic thickener, ensuring uniform and long-lasting radiation blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If UV blockers are applied only to the oil phase part, then the formulation is simpler, but the blocking effect is not uniform and water resistance is poor
Solution Approach 1:
The patent divides UV blockers into two segments: one type applied to the oil phase and another type applied to the aqueous phase. This segmentation ensures that UV protection is distributed uniformly across both phases, improving water resistance and blocking effect uniformity while maintaining formulation simplicity through targeted application.
Solution Approach 2:
The patent applies different types of UV blockers to different phases (oil and aqueous) based on their solubility characteristics. This local quality approach ensures each phase contributes optimally to UV protection, with oil-soluble blockers in the oil phase and water-soluble blockers in the aqueous phase, achieving uniform blocking effect and improved water resistance.
2Ease of manufacture
If only inorganic UV blockers are used, then the formulation is simpler, but the blocking efficacy against a wide range of wavelengths is insufficient
Solution Approach 1:
The patent merges inorganic UV blockers with organic UV blockers in a single formulation. The inorganic blockers provide protection against certain UV wavelengths while organic blockers supplement protection against other wavelengths, creating a comprehensive broad-spectrum UV protection system that maintains formulation simplicity through synergistic combination.
Solution Approach 2:
The patent creates a composite UV blocking system by combining inorganic and organic UV blockers. This composite approach leverages the complementary wavelength coverage of both blocker types, achieving superior broad-spectrum protection while maintaining ease of manufacture through a unified formulation approach.
3Ease of manufacture
If thickeners are applied only to the oil phase part, then the formulation is simpler, but the stability and uniformity of blocking effect are reduced
Solution Approach 1:
The patent segments thickeners into two categories: oil-soluble thickeners applied to the oil phase and water-soluble thickeners applied to the aqueous phase. This segmentation ensures proper viscosity control and stability in both phases, maintaining formulation simplicity while achieving enhanced formulation stability and uniform blocking effect.
Solution Approach 2:
The patent applies thickeners locally to appropriate phases based on solubility characteristics. Oil-soluble thickeners are applied to the oil phase to control its viscosity, while water-soluble thickeners are applied to the aqueous phase to control its viscosity. This local quality approach ensures optimal stability and uniformity in both phases while maintaining formulation simplicity.
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 effectively blocks UV radiation (UVA, UVB, UVC, and blue light) with uniformity and stability, providing excellent long-term water resistance and consistent blocking efficacy across varying wavelengths.
Implementation Method 1
the cosmetic composition containing at least three UV blockers... exhibiting not only an excellent blocking effect against UV radiation (UVA, UVB, and UVC) in a wide range of wavelengths
Data Source
Figure 1A
Figure 1B
AI summary
A cosmetic composition of the present invention, which has an excellent effect of blocking harmful radiation including ultraviolet radiation, contains at least three UV blockers, an emulsifier, and a thickener, and thus may exhibit an excellent effect of blocking harmful radiation including ultraviolet radiation by stabilizing the at least three UV blockers in the formulation. In addition, the cosmetic composition has excellent long-lasting water resistance, and thus it may continuously exhibit an excellent effect of blocking harmful radiation even when the user perspires or engages in activities in water.