Spherical Silica Reducing Sand Adhesion in Sunscreens
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Solution Overview
Problem
Current sunscreens with high sun protection factors (SPF 30 and higher) often have sticky properties, leading to sand adhesion issues, especially when used on the beach, and existing solutions have not adequately addressed this problem.
Innovation Solution
Incorporating a spherical silicate with an average particle size of 4.0 to 6.0 μm and an oil absorption of 250 to 350 ml/100 g, along with at least one organic UV filter absorbing in the UV-A range, into cosmetic preparations to reduce sand adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high SPF sunscreen preparations are used to protect skin from UV damage, then skin protection effectiveness is improved, but sand adhesion increases due to stickiness
Solution Approach 1:
The patent changes the physical and chemical parameters of silica by controlling its particle size (4.0-6.0 μm) and oil absorption capacity (250-350 ml/100 g), transforming it from a sticky substance to a sand-repellent agent that maintains sunscreen effectiveness while reducing sand adhesion
Solution Approach 2:
The patent creates a composite formulation combining specifically parameterized silica with UV filters and other cosmetic ingredients, where the silica acts as a sand-repellent matrix that maintains skin protection while preventing sand adhesion through its unique physical properties
2Reliability
If UV filter content is increased to achieve higher SPF, then skin protection is improved, but stickiness and sand adhesion are worsened
Solution Approach 1:
The patent introduces silica with specific parameters as an intermediary substance that mediates between UV filters and the environment, allowing high SPF formulations to achieve sand-repellent properties by absorbing excess oil and reducing surface stickiness
Solution Approach 2:
By precisely controlling silica particle size (4.0-6.0 μm) and oil absorption (250-350 ml/100 g), the patent transforms silica into a mediator that enables high SPF formulations to exhibit sand-repellent behavior without increasing stickiness
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 this specific spherical silicate effectively suppresses sand adhesion, providing a non-sticky sunscreen with improved performance even in high SPF formulations.
Implementation Method 1
a spherical silicate with the INCI name Silica, having a mean particle size of 4.0 to 6.0 μm and an oil absorption of 250 to 350 ml/100 g
Data Source
AI summary
Use of a spherical silicate (INCI Silica) with an average particle size of 4.0 to 6.0 µm and an oil absorption of 250 to 350 ml/100 g (measured according to the Japanese industrial standard K-5101) in cosmetic preparations for reducing the sand-adhering properties of the preparation, as well as a cosmetic preparation containing a spherical silicate (INCI Silica) with an average particle size of 4.0 to 6.0 µm and an oil absorption of 250 to 350 ml/100 g (measured according to the Japanese industrial standard K-5101) and at least one organic UV filter absorbing in the UV-A range.