Closed-Cell Resin Particles for Wet-State Cosmetic Shielding
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Solution Overview
Problem
Existing cosmetic compositions fail to provide sufficient shield maintaining properties in a wet state while achieving both transmitting properties and haze, particularly due to the use of inorganic powders with high refractive indices or particles outside the Mie scattering region.
Innovation Solution
Resin particles with closed cells inside, having a volume-average particle size of 1 µm to 30 µm, an average long axis length of 0.1 µm to 2.0 µm for the closed cells, and a closed cell porosity of 1% to 40%, made from biodegradable materials like cellulose, to enhance shield maintaining properties and achieve both transmitting properties and haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic powders with high refractive indices are used to improve shield properties, then shield maintaining properties are enhanced, but transmitting properties and haze are compromised
Solution Approach 1:
The patent changes the particle size parameters of the resin particles to fall within the Mie scattering region (1-30 µm volume-average particle size), which fundamentally alters the light interaction mechanism from refraction-based shielding to scattering-based soft focus effect, achieving both shield properties and transmitting properties simultaneously
Solution Approach 2:
The patent uses composite resin particles containing both solid resin matrix and internal closed cells (air or low refractive index material), creating a composite structure that provides shielding through scattering while maintaining transparency and soft focus effect through the controlled cell structure and refractive index matching
2Reliability
If resin particles with larger volume-average particle size (>30 µm) are used to improve shield properties, then shielding is enhanced, but both transmitting properties and haze are reduced
Solution Approach 1:
The patent precisely controls the volume-average particle size parameter within 1-30 µm to ensure particles remain in the Mie scattering region, where particles are large enough to scatter light effectively for shielding but small enough to maintain transparency and soft focus effect, avoiding the excessive scattering and opacity that occurs with larger particles
3Reliability
If closed cells with larger average long axis length (>2.0 µm) are used to improve shield properties, then shielding is enhanced, but transmitting properties deteriorate
Solution Approach 1:
The patent controls the average long axis length of closed cells within 0.1-2.0 µm to optimize the scattering effect within the particle structure, ensuring cells are large enough to provide shielding through internal scattering but small enough to maintain overall particle transparency and soft focus effect
Solution Approach 2:
The patent creates local scattering centers through closed cells distributed within the resin particle matrix, where each cell provides localized shielding effect while the overall particle structure maintains transparency and soft focus effect through the controlled size and distribution of these local scattering centers
4Illumination intensity
If closed cell porosity is increased (>40%) to improve transmitting properties, then transparency is enhanced, but shield maintaining properties are reduced
Solution Approach 1:
The patent optimizes closed cell porosity within 1-40% to balance the competing requirements: sufficient porosity to maintain transparency and soft focus effect by allowing light transmission, but limited porosity to maintain adequate shielding properties through sufficient scattering centers within the particle structure
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 resin particles maintain excellent shield properties in a wet state, reduce color darkening from sebum absorption, and provide a soft focus effect by scattering light effectively, improving cosmetic texture.
Implementation Method 1
the resin particles... can achieve both transmitting properties and haze... that scattering light effectively
Data Source
AI summary
Resin particles have closed cells inside and have a volume-average particle size of 1 µm or more and 30 µm or less, the closed cells have an average long axis length of 0.1 µm or more and 2.0 µm or less, and a closed cell porosity is 1% or more and 40% or less.