Skin Barrier Particle Composition for Air Pollutant Adhesion Suppression
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Solution Overview
Problem
Existing cosmetic materials fail to effectively prevent the adhesion of harmful air substances such as PM 2.5, pollens, and yellow sand to the skin while maintaining a pleasant feel after application.
Innovation Solution
An external preparation containing a specific ratio of metal oxide particles with an average primary diameter of 10 to 50 nm and non-disintegrable particles with an average diameter of 1 µm to 10 µm, applied to the skin to form nano-size irregularities, reducing adhesion of harmful substances and providing a silky feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional cosmetic materials are used to protect skin from air harmful substances, then some protection is provided, but the adhesion suppression effect is insufficient and the feel after application is poor
Solution Approach 1:
The patent applies parameter changes by precisely controlling the particle size parameters of the metal oxide (average primary particle diameter 10-50 nm) and the mass ratio parameters (component A: 2-10% by mass, ratio (A)/(B): 0.30-5.0). These parameter optimizations enable the formation of nano-size irregularities on the skin surface that effectively suppress adhesion of air harmful substances while maintaining a pleasant dry silky feel after application
Solution Approach 2:
The patent uses composite materials by combining metal oxide particles (component A) with other inorganic fine particles (component B) to create an external preparation with synergistic effects. The metal oxide forms nano-size irregularities on the skin surface for adhesion suppression, while the composite structure ensures both high protection efficacy and excellent sensory feel
2Object-affected harmful factors
If inorganic powder such as titanium oxide or zinc oxide is blended in external preparation, then UV protection is provided, but the external preparation gives a poor feel after application
Solution Approach 1:
The patent resolves this contradiction by changing the particle size parameter of the metal oxide to an ultra-fine range (average primary particle diameter 10-50 nm) and optimizing the mass ratio parameter (component A content: 2-10% by mass). These parameter changes allow the inorganic powder to provide UV protection through the formation of nano-size irregularities on the skin surface while eliminating the poor feel associated with conventional inorganic powder formulations
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 method achieves a high adhesion suppression effect against harmful substances with an excellent feel, especially a dry silky texture after application.
Implementation Method 1
the component (A) is surface-hydrophobized
Implementation Method 2
to suppress adhesion of air harmful substances to the skin
Data Source
Figure 1
AI summary
Disclosed is a method for suppressing adhesion of air harmful substances, including applying an external preparation to skin to suppress adhesion of air pollutants to the skin, wherein the external preparation contains the following component (A) and component (B), and the ratio by mass of the content of the component (A) to the content of the component (B) in the external preparation [(A)/(B)] is 0.30 or more and 5.0 or less. Component (A): a metal oxide having an average primary particle diameter dA of 800 nm or less. Component (B): non-disintegrable particles having an average particle diameter DB of 1 µm or more and 10 µm or less.