Sunscreen Composition with BEMT and Inorganic Filters
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Solution Overview
Problem
Current sunscreen compositions face challenges in providing efficient and safe UV protection with reduced stickiness, whitening effect, fabric staining, and improved water resistance, while also minimizing the use of potentially allergenic UV filters and ensuring photostability.
Innovation Solution
A sunscreen composition comprising bis-ethylhexyloxyphenol methoxyphenyl triazine, titanium dioxide, and zinc oxide, with specific particle size and surface treatment configurations, and excluding certain UV filters like octocrylene and avobenzone, to enhance photostability and water resistance while reducing stickiness and fabric staining.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of UV filters are used to achieve efficient UV protection (high SPF value), then UV protection efficiency is improved, but the risk of allergic reactions increases and safety deteriorates
Solution Approach 1:
The patent uses a composite UV filter system combining BEMT (broadband filter absorbing both UVA and UVB) with inorganic filters titanium dioxide and zinc oxide. This composite approach provides comprehensive UV protection across different wavelength ranges, achieving high SPF values while using lower total concentrations of organic UV filters to minimize allergic reaction risks.
Solution Approach 2:
The patent specifies precise concentration ranges for each UV filter component (BEMT: 0.1-10% wt, titanium dioxide: 1-30% wt, zinc oxide: 1-30% wt) to optimize the balance between protection efficiency and safety. By controlling these parameters, the formulation achieves efficient UV blocking while maintaining low levels of potentially allergenic substances.
2Reliability
If conventional UV filter combinations are used to provide broad-spectrum protection, then UV protection coverage is improved, but photostability deteriorates due to photodegradation and free radical formation
Solution Approach 1:
The patent addresses photostability issues by using BEMT, a photostable broadband filter that does not degrade under UV exposure. Unlike conventional filters that may photodegrade and form free radicals, BEMT maintains its structural integrity and continues providing protection without generating harmful byproducts, thus converting the challenge of long-term stability into a benefit.
Solution Approach 2:
The combination of BEMT with inorganic filters titanium dioxide and zinc oxide creates a synergistic system where BEMT provides stable broadband absorption while the inorganic particles provide additional UV blocking and physical stability, together enhancing overall photostability compared to organic filters alone.
3Reliability
If traditional sunscreen formulations are used to achieve UV protection, then sun protection function is improved, but consumer convenience deteriorates due to stickiness, whitening effect, and fabric staining
Solution Approach 1:
The patent employs specific concentration ranges and formulations of UV filters combined with emollients and solvents to modify the physical properties of the sunscreen. This optimization reduces excessive stickiness and whitening effects while maintaining adequate UV protection, thereby improving consumer comfort and ease of use.
Solution Approach 2:
The formulation uses different components with specific functions: UV filters for protection, emollients for skin feel and reduced stickiness, and solvents for uniform distribution. Each component is optimized locally to contribute to overall performance while minimizing unwanted effects like fabric staining and excessive whitening.
4Reliability
If standard sunscreen compositions are formulated to provide UV protection, then protection performance is improved, but water resistance deteriorates making it difficult to maintain during swimming or sweating
Solution Approach 1:
The patent combines organic UV filter BEMT with inorganic filters titanium dioxide and zinc oxide in a formulation that includes water-resistant excipients and film-forming agents. This composite structure creates a more stable film on the skin that resists washoff during water exposure, improving water resistance while maintaining UV protection performance.
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 efficient UV-A and UV-B protection with reduced stickiness and fabric staining, improved water resistance, and enhanced photostability, while minimizing the use of potentially allergenic UV filters, thus meeting consumer demands for convenience and safety.
Implementation Method 1
bis-ethylhexyloxyphenol methoxyphenyl triazine (INCI bis-ethylhexyloxyphenol methoxyphenyl triazine, BEMT) having the formula (1)... UV-A filter, UV-B filter and broadband filters... all have a high absorption efficacy in the UV-light range
Implementation Method 2
titanium dioxide (TiO2)... inorganic UV filters... all have a high absorption efficacy in the UV-light range
Implementation Method 3
zinc oxide (ZnO)... inorganic UV filters... all have a high absorption efficacy in the UV-light range
Data Source
AI summary
The present application relates to a sunscreen or daily care composition comprising bis-ethylhexyloxyphenol methoxyphenyl triazine (INCI bis-ethylhexyloxyphenol methoxyphenyl triazine), titanium dioxide, and zinc oxide.