Silicone Elastomer Coated Composite Particles for Cosmetics
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Solution Overview
Problem
Existing cosmetic compositions fail to achieve a natural finish feel while effectively concealing skin configuration troubles like wrinkles and blemishes, as they often suffer from issues such as creasing, poor adhesion, and reduced retention due to the use of diffuse reflectance powders and fine particulate silica.
Innovation Solution
Composite particles comprising core particles coated with a silicone elastomer using a silicone resin binder, achieved through a hydrolytic condensation reaction with alkoxysilanes and silanol-containing silanes, which enhances spreadability, softness, adhesion, and skin-configuration correcting effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If flaky fine powder with spherical fine particles is used to achieve high surface diffuse reflectance effects, then gloss reduction and soft focus effect are improved, but the cosmetic composition forms creases upon application and cannot obtain a natural finish
Solution Approach 1:
The patent uses composite powder consisting of flaky substance cores (such as mica) coated with spherical fine particulate silica, creating a material that combines the light-diffusing properties of flaky structures with the smooth, crease-preventing characteristics of spherical particles. This composite structure resolves the contradiction by achieving both gloss reduction and application smoothness simultaneously.
2Illumination intensity
If fine particulate silica is used as coating material to achieve high surface diffuse reflectance, then light diffusion effect is improved, but the area of contact between composite powder and skin decreases, reducing adhesion and retention
Solution Approach 1:
The patent applies local quality by concentrating the light-diffusing silica coating on the surface of the flaky cores, while the core structure itself provides the contact area with skin. This localized distribution allows the silica to provide optical effects without compromising the overall adhesion provided by the flaky core structure.
3Reliability
If proportion of fine particulate silica is lowered to improve adhesion of composite powder to skin, then adhesion is improved, but the effects for configuration troubles cannot be obtained sufficiently
Solution Approach 1:
The composite powder structure allows optimization of the silica-to-core ratio to achieve both adequate adhesion and sufficient light diffusion effects. The flaky core provides adhesion while the silica coating provides optical effects, and their proportions can be balanced to resolve this contradiction.
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 composite particles provide a natural finish feel, improved adhesion, and enhanced skin-configuration correcting effects, maintaining the cosmetic film's integrity and appearance over time.
Implementation Method 1
adding an acidic substance or alkaline substance and a compound selected from alkoxysilanes and silanol-containing silanes and partial condensation products thereof to a mixed aqueous dispersion having the core particles and a silicone elastomer dispersed therein and subjecting the compound to a hydrolytic condensation reaction, thereby causing the silicone elastomer to adhere to the surfaces of the core particles
Data Source
Figure 1~2
AI summary
Composite particles formed of core particles and a silicone elastomer adhered to surfaces of the core particles.