Fatty Acid-Coated Titanium Oxide Powder for Low-Photoactivity Cosmetics
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Solution Overview
Problem
Existing surface treatments for fine particulate titanium oxide in cosmetics face challenges in balancing the suppression of photoactivity and the amount of fatty acid used, leading to issues with viscosity and stability in pharmaceutical preparations.
Innovation Solution
A surface-treated powder of fine particulate titanium oxide is formulated with a specific product of particle diameter and fatty acid ratio within a predetermined range, suppressing photoactivity and fatty acid elution to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the fine particulate titanium oxide is surface-treated by a fatty acid to suppress photoactivity, then the photoactivity is suppressed, but the treatment amount of fatty acid becomes excessively large
Solution Approach 1:
The patent introduces an aluminum hydroxide coating as an intermediary layer between the titanium oxide core and the fatty acid surface treatment. This mediator reduces the direct interaction between fatty acid and titanium oxide surface, allowing effective photoactivity suppression with reduced fatty acid用量. The aluminum hydroxide layer acts as a buffer that modifies the surface properties, enabling more efficient fatty acid adsorption and coverage.
Solution Approach 2:
The patent creates a composite surface treatment structure consisting of titanium oxide core, aluminum hydroxide coating layer, and fatty acid surface treatment. This multi-layer composite approach combines the photoactivity suppression capability of aluminum hydroxide with the dispersibility enhancement of fatty acid, achieving both objectives with optimized material quantities.
2Quantity of substance
If the treatment amount of fatty acid is reduced to the necessary amount for dispersibility, then the treatment amount is optimized, but the photoactivity cannot be sufficiently suppressed and stability is worsened
Solution Approach 1:
The aluminum hydroxide coating serves as a mediator that amplifies the effectiveness of the reduced fatty acid treatment. By providing additional photoactivity suppression through the aluminum hydroxide layer, the system achieves sufficient protection with less fatty acid, resolving the contradiction between treatment amount and photoactivity suppression.
Solution Approach 2:
The patent changes the surface parameters of titanium oxide by introducing aluminum hydroxide coating, which alters the surface chemistry and morphology. This parameter change enables more efficient fatty acid adsorption and distribution, allowing effective photoactivity suppression with optimized fatty acid quantities.
3Object-affected harmful factors
If the fine particulate titanium oxide is surface-treated by aluminum hydroxide to suppress photoactivity, then the photoactivity is suppressed, but the thickening effect of carbomer cannot be maintained due to aluminum ion elution
Solution Approach 1:
The patent introduces an additional fatty acid surface treatment as a second intermediary layer between the aluminum hydroxide coating and the cosmetic formulation environment. This outer layer reduces aluminum ion elution into the formulation, preventing carbomer-thickening effect degradation while maintaining photoactivity suppression provided by the aluminum hydroxide layer.
4Object-affected harmful factors
If the excessive amount of fatty acid is used for photoactivity suppression, then the photoactivity is suppressed, but the eluted fatty acid reacts with other components generating by-products that influence viscosity and stability
Solution Approach 1:
The aluminum hydroxide coating acts as a mediator that reduces the quantity of fatty acid required for effective photoactivity suppression. By providing alternative photoactivity suppression through aluminum hydroxide, the system minimizes excessive fatty acid usage, thereby reducing elution into polar oil and subsequent by-product generation that would affect viscosity and stability.
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 effectively suppresses photoactivity and reduces fatty acid elution, maintaining stability and viscosity in cosmetic formulations.
Implementation Method 1
the fine particulate titanium oxide is surface-treated by a fatty acid such as a stearic acid
Implementation Method 2
the fine particulate titanium oxide is treated by hydrous silica or an aluminum hydroxide for the purpose of suppressing the photoactivity
Implementation Method 3
The carbomer imparts a thickening effect by mutual repulsion of negative electric charges in a carboxyl group in a structure of the carbomer
Implementation Method 4
upon elution of aluminum ions, the eluted aluminum ions acts with the carbomer in terms of charge, thereby leading to a problem in that the thickening effect of the carbomer cannot be maintained
Data Source
AI summary
Provided is surface-treated powder of a fine particulate titanium oxide, which is capable of enhancing effect to suppress photoactivity of the fine particulate titanium oxide and enhancing stability of a pharmaceutical preparation. The surface-treated powder includes the fine particulate titanium oxide as powder to be surface-treated; and a fatty acid, and a value of a product of an average primary particle diameter (nm) of the fine particulate titanium oxide and a ratio of a mass of the fatty acid (in terms of the fatty acid) to a mass of the fine particulate titanium oxide is 1.5 or more and 3.7 or less.