Double-Coated Titanium Dioxide for Stable Self-Tanning Cosmetics
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Solution Overview
Problem
Combining self-tanning agents like erythrulose or dihydroxyacetone (DHA) with inorganic UV-filters, such as titanium dioxide, often results in unwanted discoloration and stability issues in cosmetic compositions, making it difficult to achieve a natural-looking tan without the risks associated with UV exposure.
Innovation Solution
A cosmetic composition comprising a self-tanning agent, specifically erythrulose, combined with a double-coated titanium dioxide that is substantially free of aluminum coating, featuring an inner inorganic silica coating and an outer organic coating, such as silicone oils, improves stability and transparency, reducing discoloration and enhancing chromaticity and homogeneity of the skin coloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic UV-filters such as titanium dioxide are combined with self-tanning agents like erythrulose or DHA, then sun protection and tanning effects are achieved, but unwanted brown discoloration and stability issues occur
Solution Approach 1:
The patent applies an intermediary substance (coating material) between the titanium dioxide particles and the self-tanning agent to prevent direct interaction. The coating acts as a barrier that stops the chemical reaction causing discoloration while allowing the UV-filter and self-tanning functions to operate independently without interference
Solution Approach 2:
The harmful reactive surface of the titanium dioxide is extracted or removed by coating the particles. This isolates the problematic interface between the inorganic UV-filter and organic self-tanning agent, separating their functions and preventing the discoloration reaction while maintaining both protective and tanning capabilities
2Adaptability or versatility
If typical self-tanning ingredients are combined with inorganic UV-filters, then comprehensive skin care is provided, but chemical incompatibility leads to formulation instability
Solution Approach 1:
The patent creates a composite structure where titanium dioxide particles are coated with a protective material. This composite approach combines the UV-filtering properties of titanium dioxide with the chemical stability of the coating material, enabling stable coexistence with self-tanning agents while maintaining comprehensive skin care functionality
Solution Approach 2:
The coating material serves as an intermediary layer that mediates between the inorganic UV-filter and organic self-tanning ingredients. This intermediary prevents direct chemical interactions that cause instability while allowing both functional ingredients to work together in the same formulation
3Reliability
If aluminium coated titanium dioxide is used in self-tanning compositions, then UV protection is enhanced, but discoloration of the composition increases
Solution Approach 1:
The patent changes the parameter of the coating material from aluminium-based to an alternative material that does not promote discoloration. This parameter change maintains the UV protection enhancement while eliminating the harmful discoloration effect by selecting a chemically compatible coating material
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 composition provides a stable, long-lasting, and homogeneous skin color similar to natural tanning, reducing the 'whitening effect' and maintaining appearance over time, while being safer than traditional UV exposure methods.
Implementation Method 1
the combination of certain titanium dioxides with a self tanning agent in cosmetic compositions overcomes the shortcomings of the prior art by significantly improving the stability of the compositions, reducing the discoloration of the formulations while showing an enhanced transparency
Implementation Method 2
at least one titanium dioxide which is substantially free of any aluminium coating characterized in that the self tanning agent is erythrulose and the titanium dioxide is a double coated titanium dioxide having an inner inorganic silica coating and an outer organic coating
Implementation Method 3
self-tanning agents such as erythrulose or dihydroxyacetone (DHA) which, when topically applied onto the skin, in particular onto the face, elicit a tanning effect with an appearance more or less similar to that resulting from prolonged exposure to the sun (natural tanning) or under a UV lamp
Implementation Method 4
The majority of cosmetic products for the artificial tanning of the skin are based on carbonyl derivatives which permit the formation of colored compounds by interaction with the amino acids of the skin
Implementation Method 5
the titanium dioxide is a double coated titanium dioxide having an inner inorganic silica coating and an outer organic coating selected from silicone oils, alkyl silanes, olefinic acids, polyols or organophosphonic acids and mixtures thereof
Data Source
AI summary
The present invention relates to novel cosmetic or dermatological compositions comprising at least one specific titanium dioxide and at least one self-tanning agent and a cosmetically acceptable carrier. The compositions are in particular suitable for artificial/sunless tanning and/or browning of human skin.