UV Filter Compositions Using Closed-Cell Metal Oxide Particles
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Solution Overview
Problem
Current UV filter compositions face challenges in achieving high sun protection factor (SPF) due to low solubility of UV filters and regulatory limitations, while increasing SPF often results in undesirable effects like skin whitening.
Innovation Solution
Incorporating closed-cell metal oxide particles, such as those with a silica or titania matrix, into UV filter compositions to enhance SPF without causing whitening effects, as these particles interact with UV and visible radiation through light interference, reducing transmittance without increasing UV absorber concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of UV absorber is increased to achieve high SPF, then sun protection factor is improved, but solubility limitations and regulatory constraints prevent further incorporation
Solution Approach 1:
The patent introduces metal oxide particles as intermediary substances that mediate between the UV absorber and solar radiation. These particles interact with UV and visible radiation through light interference mechanisms, reducing transmittance without requiring increased UV absorber concentration, thus resolving the solubility and regulatory constraints
Solution Approach 2:
The invention creates a composite UV filter composition combining UV absorbers with metal oxide particles. This composite approach allows the system to achieve high SPF through the synergistic effect of UV absorption and light interference, bypassing the limitation of maximum UV absorber concentration
2Reliability
If agents are added to increase SPF, then sun protection factor is improved, but scattering of solar radiations occurs causing whitening effect
Solution Approach 1:
The patent applies local quality by using metal oxide particles with specific properties (closed-cell structure, particular size range) that provide UV protection locally through light interference without causing widespread scattering. The particles are designed to interact selectively with UV and visible radiation while maintaining transparency in the visible range, thus preventing whitening effect
Solution Approach 2:
The invention utilizes optical properties of metal oxide particles that interfere with UV and visible radiation in a way that maintains transparency. The particles are engineered to not scatter visible light significantly, thereby avoiding the whitening effect while still providing effective UV protection
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 use of closed-cell metal oxide particles effectively increases the SPF of UV filter compositions while maintaining transparency and preventing unwanted skin whitening, providing improved sun protection without adverse appearance effects.
Implementation Method 1
these particles interact with UV and visible radiation through light interference, reducing transmittance without increasing UV absorber concentration
Data Source
AI summary
The present invention relates to a method for increasing sun protection factor (SPF) of a UV filter composition, use of closed-cell metal oxide particles for increasing SPF of a UV filter composition and UV filter compositions comprising the closed-cell metal oxide particles.