Low-Stickiness Sunscreen Composition with Coated Microfine Zinc Oxide
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Solution Overview
Problem
Existing sunscreens with high UV filter content often exhibit stickiness and sand adhesion, leading to insufficient protection and consumer dissatisfaction, and some UV filters like octocrylene raise health concerns.
Innovation Solution
A sunscreen composition combining microfine zinc oxide with specific surface coatings, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2-phenylbenzimidazole-5-sulfonic acid, and 4,4'-((6((4 (((1,1-dimethylethyl)amino)carbonyl)phenyl)-amino)-1,3,5-triazine-2,4-diyl)diimino)bis(2-ethylhexyl)benzoate, with particle sizes and coatings optimized to reduce stickiness and sand adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high UV filter content is used to achieve high sun protection factor, then skin protection effectiveness is improved, but stickiness and sand adhesion increase
Solution Approach 1:
The patent applies parameter changes by using microfine zinc oxide with specifically controlled particle size (50-200 nm Dn50) and applying surface coatings (aluminum stearate, stearic acid, methicone, simethicone, triethoxycaprylylsilane, or octyltrimethoxysilane) to modify the physical and chemical properties of the UV filter, thereby reducing stickiness and sand adhesion while maintaining high SPF
Solution Approach 2:
The patent uses composite materials by combining microfine zinc oxide with specific surface coatings to create a composite UV filter system that maintains high UV protection while reducing the harmful sticky properties through the coating layer
2Stability of the object's composition
If octocrylene is used as UV filter and solvent to improve solubility of triazine derivatives, then solubility is improved, but health concerns and consumer acceptance deteriorate
Solution Approach 1:
The patent extracts and removes octocrylene from the formulation, replacing it with microfine zinc oxide as the primary UV filter. This eliminates the controversial ingredient while maintaining the necessary UV protection and solubility through the zinc oxide-based system with surface coatings
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 achieves a high sun protection factor with reduced stickiness and sand adhesion, avoiding the use of controversial UV filters like octocrylene, ensuring effective and safe skin protection.
Implementation Method 1
a surface coating which is hydrophobic or lipophobic
Implementation Method 2
microfine zinc oxide, wherein preferably the microfine zinc oxide has a mean particle size Dn50 as determined by Laser diffraction selected in the range from 50 to 200 nm
Implementation Method 3
microfine zinc oxide... for protecting the skin against the detrimental effects of UV-light
Data Source
AI summary
The present invention relates to a topical preparation comprising a UV filter combination of certain microfine zinc oxide, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine), 2-phenylbenzimidazole-5-sulfonic acid and/or one or more salts thereof and 4,4'-((6((4 (((1,1-dimethylethyl)amino)carbonyl)phenyl)-amino)- 1,3,5-triazine-2,4-diyl)diimino)bis(2-ethylhexyl)benzoate (INCI: Diethylhexyl butamido triazone).