Sunscreen UV System Zinc Oxide BEMT Texture
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Solution Overview
Problem
Existing sunscreen compositions struggle to achieve high UV protection while maintaining a non-greasy, pleasant texture that does not cause a white cast on the skin, especially when balancing UVA and UVB protection.
Innovation Solution
The use of a UV absorbing system comprising zinc oxide and bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) in sunscreen compositions, which are formulated to be non-greasy and non-whitening upon application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of UV filters are used to achieve high UV protection, then UV protection efficacy is improved, but the composition becomes greasy and unpleasant on the skin
Solution Approach 1:
The patent combines organic UV filters (providing high UV protection) with silicone-based compounds (providing non-greasy, pleasant texture) to create a composite formulation that achieves both high UV protection efficacy and comfortable skin feel without the greasiness associated with high levels of organic UV filters alone
2Reliability
If mineral UV filters such as zinc oxide are used to provide UV protection, then UV protection is improved, but the composition causes a white cast on the skin
Solution Approach 1:
The patent uses micronized or nanosized zinc oxide particles instead of conventional larger particles, changing the particle size parameter to reduce light scattering and eliminate the white cast while maintaining UV protection efficacy
Solution Approach 2:
The patent combines zinc oxide with silicone-based compounds and other organic UV filters to create a composite formulation that provides high UV protection while the silicone components and particle size modification eliminate the unwanted white cast effect
3Illumination intensity
If low levels of mineral UV filters are used to avoid white cast, then the composition is non-whitening, but UV protection is insufficient
Solution Approach 1:
The patent merges mineral UV filters (zinc oxide) with organic UV filters and silicone-based compounds in a combined formulation, where each component contributes to UV protection, allowing low levels of mineral filters to be used while achieving high overall UV protection through the synergistic combination of multiple filter types
4Reliability
If organic UV filters are used to achieve high UV protection, then UV filtering efficiency is improved, but the composition becomes very greasy and unpleasant on the skin
Solution Approach 1:
The patent introduces silicone-based compounds as intermediary ingredients that modify the surface properties and spreadability of the organic UV filters, reducing greasiness and improving skin feel while allowing high levels of organic UV filters to be used for maximum UV protection efficacy
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 compositions provide high UV protection with balanced UVA and UVB protection, maintaining a pleasant texture and avoiding the white cast issue, thus addressing the limitations of current sunscreen formulations.
Implementation Method 1
a UV absorbing system comprising 2,4-bis-{[4-(2-ethyl hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine (INCI name: bis-ethylhexyloxyphenol methoxyphenyl triazine) and zinc oxide
Data Source
AI summary
The present disclosure relates to compositions including a UV absorbing system including bemotrizinol and zinc oxide, as well as to methods of making and using such compositions.