Low-Stickiness Sunscreen Composition for High SPF Protection
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Solution Overview
Problem
Existing sunscreens with high UV filter content often exhibit stickiness and sand adhesion, leading to reduced usage and inadequate protection, and some UV filters like octocrylene raise consumer concerns despite their use.
Innovation Solution
A sunscreen composition combining microfine zinc oxide, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2-phenylbenzimidazole-5-sulfonic acid, and 2,4,6-tris[anilino(p-carbo-2′-ethyl-1′-hexyloxy)]-1,3,5-triazine, with specific particle sizes and surface coatings, to enhance solubility and reduce stickiness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high UV filter content is used to achieve high SPF protection, then UV protection effectiveness is improved, but stickiness and sand adhesion increase
Solution Approach 1:
The patent changes the physical and chemical parameters of the UV filters by using microfine zinc oxide with specific particle size (30-200 nm) and surface coating, and selecting specific organic UV filters with appropriate solubility characteristics. This parameter optimization allows achieving high SPF protection while minimizing stickiness and sand adhesion through controlled particle properties and solubility.
Solution Approach 2:
The patent employs a composite formulation combining multiple UV filter types (microfine zinc oxide with specific surface coating, bis-ethylhexyloxyphenol methoxyphenyl triazine, 2-phenylbenzimidazole-5-sulfonic acid, and ethylhexyl triazone) in optimized proportions. This composite approach distributes the UV protection function across different materials with complementary properties, reducing the stickiness issues associated with high concentrations of any single UV filter.
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 consumer acceptance decreases due to hormonal activity concerns
Solution Approach 1:
The patent extracts and removes octocrylene from the formulation, replacing it with alternative UV filters (microfine zinc oxide with surface coating and specific organic triazines) that provide equivalent or superior solubility for triazine derivatives without the hormonal activity concerns. This extraction eliminates the harmful factor while preserving the solubility function.
Solution Approach 2:
The patent substitutes the controversial octocrylene with alternative UV filter combinations that are perceived as safer by consumers. The new formulation uses microfine zinc oxide and specific organic UV filters that have established safety profiles, effectively replacing the problematic ingredient with safer alternatives that achieve the same technical function.
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 provides a high SPF sunscreen with reduced stickiness and sand adhesion, stable UV filter solubility without using octocrylene, ensuring effective UV protection.
Implementation Method 1
a.) microfine zinc oxide, which preferably has a mean particle size Dn50 as determined by Laser diffraction selected in the range from 30 to 200 nm and a surface coating selected from the group consisting of triethoxycaprylylsilane, octyltrimethoxysilane and dimethicone
Implementation Method 2
microfine zinc oxide...mean particle size Dn50 as determined by Laser diffraction selected in the range from 30 to 200 nm
Implementation Method 3
b.) 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI: Bis-Ethylhexyloxyphenol methoxyphenyl Triazine), c.) 2-phenylbenzimidazole-5-sulfonic acid and/or one or more salts thereof and d.) at least one of 2,4,6-tris[anilino(p-carbo-2′-ethyl-1′-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone)
Data Source
AI summary
The embodiments of present invention disclosed herein relate 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 2,4,6-tris[anilino(p-carbo-2′-ethyl-1′-hexyloxy)]-1,3,5-triazine (INCI: Ethylhexyl Triazone).