Coated Titanium Oxide Powder for Natural Shading
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Solution Overview
Problem
Conventional titanium oxide powders fail to achieve compatibility between a natural makeup texture and a shading effect, resulting in unnatural skin appearance due to issues with pallor and yellow dullness.
Innovation Solution
A novel coated titanium oxide powder with multiple coating layers of silicon oxide, aluminum oxide, and iron oxide, having specific mean particle diameters and optical properties, is developed to provide a natural shading effect and reduce skin pallor and yellow dullness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional titanium oxide powder is used to provide shading effect, then the masking effect is improved, but the natural makeup texture deteriorates due to opaque appearance and yellow dullness
Solution Approach 1:
The patent applies composite materials by combining titanium oxide core particles with multiple coating layers of silicon oxide, aluminum oxide, and iron oxide. This composite structure allows the inner titanium oxide to provide strong UV absorption and shading, while the outer metal oxide layers control light reflection and transmission to achieve natural skin tone appearance, resolving the contradiction between masking effect and natural texture
Solution Approach 2:
The patent implements local quality by creating different functional zones within the particle structure: the titanium oxide core provides UV blocking and shading properties, while the silicon oxide, aluminum oxide, and iron oxide coating layers provide selective light reflection and transmission. Each layer has optimized thickness and composition to perform its specific function, allowing simultaneous achievement of masking effect and natural appearance
2Manufacturing precision
If titanium oxide powder with high pigmenting effect is used, then the shading effect is improved, but the skin appearance deteriorates due to pallor and yellow dullness
Solution Approach 1:
The patent applies color changes by carefully selecting and controlling the thickness of iron oxide coating layers, which impart reddish-brown tones that counteract the yellow dullness inherent in titanium oxide. The iron oxide content and layer thickness are optimized to provide warm undertones that neutralize pallor and yellow discoloration, transforming the overall color appearance to achieve natural skin tone
Solution Approach 2:
The multi-layer composite structure allows the titanium oxide core to provide strong shading while the iron oxide coating layers modify the color output to eliminate pallor and yellow dullness. The composite design enables simultaneous achievement of high shading effect and natural color appearance by combining materials with complementary optical properties
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 coated titanium oxide powder achieves a natural makeup texture and shading effect while minimizing skin pallor and yellow dullness, offering improved optical properties that enhance the appearance by selectively transmitting light and reducing unwanted reflections.
Implementation Method 1
the coated titanium oxide powder in a form of a coated film has a ratio of the transmittance of transmitted light at an acceptance angle of 15 degrees to the transmittance of transmitted light at an acceptance angle of 45 degrees of 1.3 or more at a wavelength of 430 nm
Implementation Method 2
The present inventors have tried a new approach to find a titanium oxide powder having optical properties that exhibit different color tones depending on view angles
Data Source
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AI summary
To provide a titanium oxide powder that can achieve a natural makeup texture and a shading effect to the skin after the powder is applied to the skin. A coated titanium oxide powder includes a silicon oxide or hydroxide layer, an aluminum oxide or hydroxide layer, and an iron oxide or hydroxide layer. The coated titanium oxide powder has a mean particle diameter D50 of 0.20 to 0.45 µm measured by analysis of a transmission electron microscopic image. The coated titanium oxide powder has a mean particle diameter D50 of 0.6 to 1.2 µm measured by laser diffraction scattering. The coated titanium oxide powder in a form of a coated film has a ratio of the transmittance of transmitted light at an acceptance angle of 15 degrees to the transmittance of transmitted light at an acceptance angle of 45 degrees of 1.3 or more at a wavelength of 430 nm, and the ratio of the transmittance of transmitted light at an acceptance angle of 15 degrees to the transmittance of transmitted light at an acceptance angle of 45 degrees at a wavelength of 430 nm is equal to or higher than the ratio of the transmittance of transmitted light at an acceptance angle of 15 degrees to the transmittance of transmitted light at an acceptance angle of 45 degrees at a wavelength of 590 nm, where the transmitted light is generated by irradiation of the coated film with light from a CIE standard light source D65 of a variable angle spectrophotometric system at an incident angle of 0 degrees.