Rutile Titanium Dioxide Particle Morphology for UV Shielding
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Solution Overview
Problem
Current cosmetics with UV-shielding agents like fine particulate titanium dioxide and zinc oxide face challenges in achieving balanced UVB and UVA protection without causing skin irritation or thick, grainy textures, and there is a need for titanium dioxide with enhanced UVA shielding performance.
Innovation Solution
The development of rutile-type titanium dioxide with a rectangular particulate form, where rod-shaped particles are oriented and aggregated, and then treated with heat, enhancing UV-shielding performance by optimizing particle size and surface area for improved UVA and UVB protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fine particulate titanium dioxide is blended in a large amount to enhance UV-shielding effect, then UVB shielding performance is improved, but the cosmetic forms a thick film that decreases transparency and appears grainy on the skin
Solution Approach 1:
The patent changes the particle morphology parameters of titanium dioxide from conventional spherical or irregular shapes to specifically shaped particles with controlled diameter (0.5-5.0 μm) and aspect ratio (1.1-3.0). This parameter optimization allows achieving high UVB shielding with reduced particle concentration, preventing thick film formation and maintaining cosmetic transparency while avoiding grainy appearance.
Solution Approach 2:
The patent creates a composite UV-shielding system by combining specifically shaped titanium dioxide particles with organic UV absorbers in optimized ratios. This composite approach enhances overall UV protection efficiency, allowing reduced titanium dioxide content while maintaining or improving both UVB and UVA shielding performance, thereby preventing excessive film thickness and preserving transparency.
2Reliability
If zinc oxide is blended in a large concentration to improve UVA shielding, then UVA protection is enhanced, but ions elute and irritate skin
Solution Approach 1:
The patent optimizes titanium dioxide particle parameters (diameter 0.5-5.0 μm, aspect ratio 1.1-3.0) to enhance UVA shielding capability, replacing zinc oxide as the primary UVA protector. This parameter-optimized titanium dioxide provides effective UVA protection without the ion elution problem that causes skin irritation, while also maintaining UVB protection through the same particle morphology control.
3Reliability
If a UV-absorber is added in a large amount to enhance UV-shielding effect, then broad-spectrum UV protection is improved, but safety problems arise for sensitive skin
Solution Approach 1:
The patent optimizes the physical parameters of titanium dioxide particles (controlled diameter and aspect ratio) to maximize UV absorption efficiency per unit mass. This morphological optimization allows achieving high UV-shielding performance with reduced UV absorber concentration, thereby improving safety for sensitive skin while maintaining effective broad-spectrum protection.
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 resulting titanium dioxide provides excellent UV-shielding performance across a wide range, particularly in the UVA region, while maintaining transparency and reducing skin irritation, as demonstrated by high light transmissivity values and sensory test results in cosmetic formulations.
Implementation Method 1
The shielding effect against the UVB region is due to absorption of light by a band gap
Implementation Method 2
the shielding effect against the UVA region is due to scattering
Implementation Method 3
rod-shaped rutile-type titanium dioxide obtained by treating the rectangular rutile-type titanium dioxide with heat
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A Rutile-type titanium dioxide having a rectangular particulate form configured such that major axial planes of rod-shaped particles having a minor axis diameter of 3 to 10 nm are oriented and aggregated in the minor axial direction, and a rod-shaped rutile-type titanium dioxide obtained by treating the rectangular rutile-type titanium dioxide with heat, wherein an apparent average major axial length of the oriented and aggregated particles is 100 to 400 nm, an apparent average minor axial length thereof is 30 to 150 nm, an apparent average axial ratio represented by apparent average major axial length/apparent average minor axial length is 2 to 5 and a specific surface area thereof is 10 to 100 m2/g.