Micronized Benzoxazolylbenzene UV Filter for Low-Transfer Sun Care
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sun care products face challenges in achieving high SPF and UVA protection ratios while minimizing oil content and reducing material transfer to surfaces, with current UV-filters requiring multiple components and causing sensorial issues and surface smearing.
Innovation Solution
Micronizing 1,4-di(benzoxazol-2'-yl)benzene to a mean particle size of 200 nm, providing a water-dispersible, stand-alone UV-filter that meets EU protection requirements and reduces material transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple UV-filter substances are used to achieve high SPF and UVA protection, then UV protection performance is improved, but formulation complexity and oil content increase
Solution Approach 1:
The patent combines multiple UV-filter substances (benzophenone-3, ethylhexyl methoxycinnamate, and octocrylene) into a single pre-formulated microcapsule complex. This merging approach allows the product to achieve high SPF and UVA protection (meeting EU requirements with UVA-PF/SPF ratio ≥ 0.33 and critical wavelength ≥ 370 nm) while using only one ingredient in the final formulation, thereby reducing formulation complexity and the number of components needed.
2Reliability
If multiple UV-filter substances are used to achieve high SPF and UVA protection, then UV protection performance is improved, but oil content and sensorial properties worsen
Solution Approach 1:
The patent uses a microcapsule structure with a thin polymeric shell (composed of polyvinyl alcohol and carboxymethyl cellulose sodium) to encapsulate the UV-filter substances. This thin film approach allows the oil-based UV filters to be contained within water-dispersible microcapsules, reducing the need for bulk oil in the formulation while maintaining high UV protection performance. The microcapsules can be dispersed in water-based formulations, significantly reducing overall oil content compared to using multiple separate UV-filter ingredients.
3Reliability
If oil-based UV-filters are used to achieve high SPF, then UV protection performance is improved, but material transfer to surfaces increases
Solution Approach 1:
The patent introduces microcapsules as an intermediary carrier between the oil-based UV-filter substances and the application surface. The microcapsule shell acts as a mediator that prevents direct transfer of oily UV filters to surfaces like touch screens and glasses. When the product is applied, the microcapsules remain on the skin surface, encapsulating the UV filters and preventing them from migrating to external surfaces, thereby reducing material transfer 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 micronized 1,4-di(benzoxazol-2'-yl)benzene offers high SPF and UVA protection, improves formulation stability, and minimizes transfer to surfaces, enhancing product acceptability and flexibility in sun care product development.
Implementation Method 1
micronized 1,4-di(benzoxazol-2'-yl)benzene...yields a water dispersible organic UV-filter which fulfills as stand-alone filter all of the above mentioned UV-absorption requirement
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a novel micronized 1,4-di(benzoxazol-2'-yl)benzene as well as to the use thereof in topical compositions.