BEMT Emulsion with Semi-Crystalline Polymer for Non-Greasy UV Protection
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Solution Overview
Problem
Existing sunscreens face challenges in achieving high UV protection levels while maintaining a pleasant texture and non-greasy feel, due to the difficulties in formulating compositions with high levels of UV filters.
Innovation Solution
The development of emulsion compositions comprising bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) and at least one semi-crystalline polymer, along with surfactants and salt chelating agents, to create a stable and pleasant oil-in-water emulsion with enhanced UV protection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of UV filters are used to achieve high UV protection, then UV protection efficiency is improved, but texture stability and application properties deteriorate
Solution Approach 1:
The patent changes the concentration parameters of UV filters to an optimized range (0.1-10% for BEMT, 0.01-5% for other filters) rather than using high levels, and adjusts the polymer content parameter (0.1-5%) to achieve the desired balance between UV protection and application properties. This parameter optimization allows obtaining SPF 15+ and UVA1/UV ratio 0.7+ while maintaining non-greasy texture.
Solution Approach 2:
The patent creates a composite emulsion system combining UV filters (BEMT and other organic filters), semi-crystalline polymers (poly C10-30 alkyl acrylate), and surfactants. This composite approach allows the polymers to stabilize the emulsion and modulate the texture, enabling high UV protection efficiency while maintaining pleasant application properties and non-greasy feel.
2Reliability
If high levels of UV filters are used to achieve high UV protection, then UV protection efficiency is improved, but composition stability deteriorates
Solution Approach 1:
The patent introduces semi-crystalline polymers as intermediary stabilizing agents in the emulsion system. These polymers act as mediators that enhance emulsion stability and prevent phase separation, allowing the formulation to maintain composition stability even with optimized UV filter concentrations providing high UV protection efficiency.
Solution Approach 2:
The patent optimizes the concentration parameter of semi-crystalline polymers (0.1-5% of poly C10-30 alkyl acrylate) to achieve the desired emulsion stability. This parameter adjustment ensures the emulsion remains stable while accommodating the UV filter concentrations needed for high UV protection efficiency.
3Reliability
If multiple sunscreens and UV filters are combined to achieve high protection, then UV protection efficiency is improved, but formulation complexity increases
Solution Approach 1:
The patent employs BEMT as a universal UV filter that provides broad-spectrum protection (UVA and UVB) with a single ingredient, eliminating the need to combine multiple different sunscreen agents. This multi-functional approach simplifies the formulation while achieving high UV protection efficiency (SPF 15+, UVA1/UV ratio 0.7+).
Solution Approach 2:
The patent extracts and focuses on the key stabilizing component (semi-crystalline polymer, specifically poly C10-30 alkyl acrylate) that enables the simplified single-filter formulation to maintain stability and pleasant texture. By taking out this essential stabilizing element, the formulation achieves high protection with minimal ingredients.
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 effective UV protection with a critical wavelength of at least 370 nm, SPF values of at least 15, and a UVA1/UV ratio of 0.7 or higher, while maintaining a non-greasy texture and improved application properties.
Implementation Method 1
emulsion compositions comprising bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT or bemotrizinol) and at least one semi-crystalline polymer... provide effective UV protection with a critical wavelength of at least 370 nm
Data Source
AI summary
The present disclosure relates to compositions including 2,4-bis-{[4-(2-ethyl hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine and at least one semi-crystalline polymer, as well as to methods of making and using such compositions.