Two-Step Cosmetic UV Protection Method
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Solution Overview
Problem
Cosmetic products that provide daily protection against UV rays often compromise on sensory properties such as texture and feel due to the high amounts of UV-screening agents required for effective protection, especially in weak sunlight conditions.
Innovation Solution
A method involving the successive application of two cosmetic compositions, one with an oil phase and optionally an aqueous phase, and the other comprising at least 70% powders and an oil phase, where at least one composition contains UV-screening agents, to enhance UV protection without increasing the amount of UV-screening agents, thereby preserving pleasant texture and sensory properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of UV-screening agents are introduced into cosmetic products to achieve significant levels of effectiveness, then protection against UV rays is improved, but sensory properties such as texture and feel deteriorate
Solution Approach 1:
The invention divides the single cosmetic composition into two separate compositions that are applied successively. The first composition contains UV-screening agents at concentrations that provide adequate protection without compromising sensory properties, while the second composition is applied over it. This segmentation allows each composition to be optimized independently - the first for sensory quality and the second for additional protection - thereby resolving the contradiction between protection effectiveness and sensory properties.
2Reliability
If high amounts of UV-screening agents are used to achieve high protective index, then sun protection effectiveness is improved, but the product becomes suitable only for occasional intensive exposure rather than daily use
Solution Approach 1:
By segmenting the photoprotection function across two compositions applied in sequence, the invention enables daily use at lower concentrations. The first composition can be formulated with lower UV-screening agent content suitable for daily application, while the second composition provides additional protection when needed, making the system adaptable both for daily use and for occasions requiring higher protection.
Solution Approach 2:
The two-composition system serves multiple functions: the first composition provides baseline protection and cosmetic benefits for daily use, while the second composition can be applied additionally for enhanced protection during stronger sun exposure. This multi-functionality allows the same system to adapt to varying sun exposure conditions, from daily weak sunlight to intensive exposure, thereby resolving the contradiction between protective index and adaptability.
Data Source
AI summary
The present invention relates to a method for protecting the skin against UV rays, using at least two cosmetic skincare and/or make-up compositions, comprising:the application, to at least part of the skin of the body or face, of at least a first layer of a first cosmetic composition comprising an oil phase and, optionally, an aqueous phase, followed bythe application, on said first layer, of at least a second layer of a second anhydrous composition comprising at least 70 wt.-% powders selected from among fillers and pigments, and an oil phase,said method being characterized in that at least one of the two compositions contains at least one UV filter, preferably a liposoluble UV filter.The liposoluble UV filter is preferably in the second composition.The first composition is a make-up foundation or skincare base. The second composition is advantageously a loose or compact powder.The method can be used to improve the sensory properties of cosmetic products applied to the skin, preferably the face, while maintaining a satisfactory level of sun protection.