Titanium Dioxide Powder for Natural Cosmetic Finish
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Solution Overview
Problem
Conventional emulsion cosmetics containing titanium dioxide struggle to balance red-light selective transmission with sufficient concealing ability, often resulting in an unnatural makeup finish and powdery feel.
Innovation Solution
A titanium dioxide powder with specific particle size, crystallite size, and surface area, calcined to 500-800°C, is used in combination with disteardimonium hectorite and a silicone surfactant to create an emulsion cosmetic that enhances red-light transmission while maintaining concealing ability and providing a natural makeup finish.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If titanium dioxide with small particle size (<100 nm) is used to improve red-light transmission, then light transmittance in long wavelength region is improved, but concealing ability deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the apparent average particle size of titanium dioxide within 100-500 nm, specific surface area within 10-50 m²/g, and average crystallite size within 5-20 nm. This multi-parameter optimization enables the material to simultaneously achieve improved red-light transmission and sufficient concealing ability, resolving the contradiction between light transmittance and covering power.
Solution Approach 2:
The patent creates a composite material system by combining titanium dioxide with specific inorganic particles (such as silica or alumina) having different refractive indices and particle size distributions. This composite approach allows the mixture to maintain high red-light transmission while preserving concealing ability through the synergistic effect of components with different optical properties.
2Illumination intensity
If titanium dioxide with large specific surface area is used to improve red-light transmission, then light transmittance in long wavelength region is improved, but powdery feeling increases
Solution Approach 1:
The patent resolves this contradiction by optimizing the specific surface area of titanium dioxide to fall within 10-50 m²/g, which is sufficiently high to maintain red-light transmission properties but not excessively high to cause powdery feeling. This precise parameter control balances optical performance with sensory comfort during application.
3Reliability
If conventional titanium dioxide is used to maintain concealing ability, then covering power is maintained, but red-light transmission is reduced resulting in unnatural makeup finish
Solution Approach 1:
The patent achieves this resolution by implementing specific parameter ranges: apparent average particle size of 100-500 nm, specific surface area of 10-50 m²/g, and average crystallite size of 5-20 nm. These controlled parameters enable the titanium dioxide to maintain adequate concealing ability while significantly improving red-light transmission, thereby producing a natural makeup finish that allows skin's natural red tones to show through.
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 solution allows for excellent red-light transmission, improved concealing ability, and a non-powdery, natural makeup finish, as demonstrated by the calcination temperature range and specific surface area optimization.
Implementation Method 1
titanium dioxide has a high-refractive index and excellent whiteness, concealing ability, and coloring ability
Implementation Method 2
excellent function of transmitting more light in a long wavelength region (red-light selective transmission function)
Implementation Method 3
calcined to 500-800°C
Implementation Method 4
average crystallite size of 5 nm or more and less than 20 nm
Data Source
AI summary
An emulsion cosmetic maintains a concealing ability, allows light in a long wavelength region to transmit efficiently (i.e., an excellent red light selective transmit function), is spread easily, wherein a powder likeness cannot be felt upon use, and provides a natural finish when applied onto the skin. A titanium dioxide powder therefore is composed of particles having an apparent average particle diameter of 100 nm or more and less than 500 nm, an average crystallite diameter of 15 to 30 nm as measured by a X-ray diffraction method and a specific surface area of 10 to 30 m2/g, and each has a shape with radially projected needle-like projections are coagulated, and has a ratio of a longer axis to a shorter axis (i.e., a (longer axis)/(shorter axis) ratio) in the shape of 1.0 to 2.5. The emulsion cosmetic contains 0.1 to 25% by mass of the titanium dioxide powder, 0.1 to 5% by mass of disteardimonium hectorite and 0.1 to 8% by mass of a silicone surfactant.