Clay and Crystallizable Fat Sunscreen Composition for Reduced Stickiness
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Solution Overview
Problem
Existing photoprotective compositions with liposoluble UV filters often have uncomfortable sensory aspects, such as a greasy or sticky feel on the skin, and there is a need for a composition that provides high UV protection without these unpleasant sensations.
Innovation Solution
A composition comprising phyllosilicates with a 2:1 layered structure, crystallizable fats, and liposoluble UV filters, which together reduce stickiness and particle adhesion while maintaining high UV protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liposoluble UV filters are used in photoprotective compositions, then UV protection is achieved, but the composition has a greasy and sticky feel on the skin
Solution Approach 1:
The patent introduces an intermediary substance (aqueous phase comprising water and optionally a solvent) that mediates between the liposoluble UV filter and the skin. This intermediary phase allows the liposoluble UV filter to maintain its UV protection function while the aqueous component provides a non-greasy, comfortable sensory experience on the skin, thus resolving the contradiction between UV protection and sensory comfort.
Solution Approach 2:
The patent changes the physical state and distribution parameters of the liposoluble UV filter by incorporating it into an emulsion system with specific water-to-oil ratios and using formulations where the aqueous phase constitutes a significant portion (e.g., >50% w/w). This parameter change allows the UV filter to remain effective while the overall composition achieves a non-greasy, comfortable feel on the skin.
2Reliability
If liposoluble UV filters are used in photoprotective compositions, then UV protection is achieved, but particle adhesion occurs
Solution Approach 1:
The aqueous phase acts as an intermediary that prevents direct adhesion between particles and the skin surface. By distributing the liposoluble UV filter within this intermediary aqueous medium, the composition maintains UV protection while the aqueous component prevents particle adhesion, thus resolving the contradiction between UV protection and particle adhesion.
3Reliability
If conventional photoprotective compositions are used, then UV protection is provided, but the composition is difficult to apply
Solution Approach 1:
The patent changes the rheological and physical parameters of the composition by using aqueous-based emulsions with specific water-to-oil ratios, incorporating hydrating agents, and adjusting viscosity. These parameter changes make the composition easier to apply (non-greasy, comfortable) while maintaining UV protection, thus resolving the contradiction between UV protection and ease of application.
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 combination of phyllosilicates and crystallizable fats in a cosmetic composition enhances the sensory experience by reducing stickiness and adhesion, providing a comfortable feel on the skin while maintaining effective UV protection.
Implementation Method 1
at least one liposoluble filter capable of absorbing UVA and/or UVB
Implementation Method 2
the combination of a clay selected from phyllosilicates having a 2:1 layered structure and at least one crystallizable fat eliminates or reduces the stickiness of such a photoprotective composition, thereby limiting particle adhesion
Data Source
AI summary
The present invention concerns a composition, in particular a cosmetic composition, comprising, in a physiologically acceptable aqueous medium:at least one clay selected from phyllosilicates having a 2:1 layered structure,at least one crystallizable fat, andat least one liposoluble filter capable of absorbing UVA and/or UVB.