Core/Shell Particles for Moisturizing Color Cosmetics
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Solution Overview
Problem
Conventional color cosmetic products face challenges in providing both moisturization and sebum removal without causing dry skin or pore blockage, as most moisturizing agents are oily and can lead to over-sebum removal issues.
Innovation Solution
Development of core/shell particles with a polar liquid core and a hydrophobic shell that transform into a cream-like form upon application, incorporating a color cosmetic, to provide both cosmetic benefits and skin substantivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oily moisturizing agents are used in color cosmetics, then skin moisturization is improved, but pore blockage and acne formation occur
Solution Approach 1:
The patent changes the physical state parameter of the moisturizing agent from liquid oil to solid powder form. The core-shell particles maintain moisturization through their liquid core that is released upon application, while the solid powder form prevents pore blockage during storage and application.
Solution Approach 2:
The patent utilizes phase transition by designing particles that transform from a dry powder state during storage to a liquid/cream-like state upon application through shear force. This allows the product to function as a moisturizer only when needed, eliminating the harmful effects of oily substances during storage.
2Object-affected harmful factors
If strong sebum removal is achieved, then pore blockage is prevented, but skin becomes dry and flakey
Solution Approach 1:
The patent applies local quality by creating particles with distinct functional zones: the hydrophobic shell provides sebum control and oil absorption at the particle surface, while the polar liquid core provides moisturization internally. This localized functional distribution allows simultaneous sebum management and skin hydration.
Solution Approach 2:
The patent uses composite materials by combining hydrophobic particles (for sebum control) with polar liquid moisturizing agents (for hydration) into a single core-shell particle structure. This composite approach enables the product to perform both sebum removal and moisturization functions simultaneously without the trade-offs of conventional formulations.
3Stability of the object's composition
If powder form is used for color cosmetics, then portability and stability are improved, but skin feel and application smoothness deteriorate
Solution Approach 1:
The patent applies dynamics by designing a particle system that is static (stable powder) during storage but becomes dynamic (transforms to liquid/cream) upon application. The shear-thinning behavior allows the particles to flow and spread smoothly on the skin, providing excellent skin feel while maintaining powder stability during storage and transport.
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 core/shell particles offer a novel foundation powder that combines skin moisturization and sebum control, maintaining a pleasant skin feel while remaining effective on the skin, addressing the limitations of traditional products.
Implementation Method 1
a polar liquid having a percent surface polarity of at least 24%
Implementation Method 2
a shell comprising hydrophobic particles
Implementation Method 3
The particles are stable in dry form and yet quickly transform into a liquid or cream-like form when subjected to shear
Data Source
AI summary
A powder is disclosed including a first powder of core/shell particles having an average particle size of less than 1000 microns, each particle contains a liquid core that is substantially free of water that includes a polar liquid having a percent surface polarity of at least 24%; and a shell comprising hydrophobic particles and a second powder including a color cosmetic.