Titanium Oxide Powder Surface Hydroxyl Control for Cosmetic Spreadability
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Solution Overview
Problem
Titanium oxide particles used in cosmetics often cause paleness and have poor spreadability and adhesion to the skin, while maintaining concealing ability and transparency.
Innovation Solution
A titanium oxide powder with a BET specific surface area of 5-15 m2/g, containing polyhedral-shaped particles with eight or more faces, and a mass reduction rate of 0.03-0.5% when heated at 800°C, is used to improve skin adhesion and spreadability while maintaining concealing ability and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional titanium oxide particles are used in cosmetics, then concealing ability is achieved, but paleness occurs and spreadability on skin deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the BET specific surface area (5-15 m2/g) and the mass reduction rate after heating (0.03-0.5%), which correlates with surface hydroxyl group density. These parameter adjustments optimize the balance between light scattering (concealing ability) and surface properties (reducing paleness), resolving the contradiction between achieving coverage and avoiding unwanted whitening effects.
Solution Approach 2:
The patent employs composite material principles by creating titanium oxide particles with specific polyhedral shapes (eight or more faces) and controlled surface properties through heating treatment. This composite approach combines geometric shape control with surface chemistry modification to achieve both concealing ability and reduced paleness simultaneously.
2Ease of manufacture
If conventional titanium oxide particles are used, then concealing ability is maintained, but adhesion to skin deteriorates
Solution Approach 1:
The patent uses parameter changes by controlling the mass reduction rate after heating at 800°C (0.03-0.5%), which directly affects surface hydroxyl group density. This parameter optimization enhances hydrogen bonding capability with skin proteins, thereby improving adhesion while preserving concealing ability through maintained light scattering properties.
Solution Approach 2:
The patent replaces mechanical adhesion mechanisms with chemical bonding mechanisms. By increasing surface hydroxyl groups through controlled heating, the patent enables hydrogen bonding and chemical interactions between titanium oxide particles and skin proteins, providing more reliable adhesion than physical attachment alone.
3Ease of manufacture
If titanium oxide particles with high surface area are used, then concealing ability improves, but spreadability on skin deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the BET specific surface area to a narrow range (5-15 m2/g) and controlling particle shape (polyhedral with eight or more faces). This balanced parameter selection prevents excessive light scattering that would cause paleness while maintaining sufficient coverage, and the surface hydroxyl group density is adjusted to enhance skin interaction for better spreadability.
Solution Approach 2:
The patent applies local quality principles by differentiating between bulk particle properties (shape, size) and surface properties (hydroxyl group density). The polyhedral shape provides optimal light scattering for concealing ability, while the surface hydroxyl groups (controlled by heating) provide localized interaction sites for skin adhesion and spreadability, resolving the contradiction between coverage and ease of application.
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 titanium oxide powder effectively reduces paleness, enhances skin adhesion, and improves spreadability while maintaining concealing ability and transparency, making it suitable for use in cosmetics like foundations.
Implementation Method 1
Titanium oxide particles have excellent light reflection characteristics, ultraviolet ray shielding characteristics
Implementation Method 2
Titanium oxide particles have excellent light reflection characteristics, ultraviolet ray shielding characteristics
Implementation Method 3
a mass reduction rate in a case of being heated at 800° C. for 1 hour in an air atmosphere is 0.03% by mass or more and 0.5% by mass or less
Data Source
AI summary
A titanium oxide powder of the present invention has a BET specific surface area of 5 m2/g or more and 15 m2/g or less and contains polyhedral-shaped titanium oxide particles having eight or more faces, in which a mass reduction rate in a case of being heated at 800° C. for 1 hour in an air atmosphere is 0.03% by mass or more and 0.5% by mass or less.