Mineral UV Filter Composition for Reducing Whitecast
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Solution Overview
Problem
Existing sunscreens struggle to provide broad-spectrum protection while minimizing whitecast, especially for skin types Fitzpatrick 4, 5, or 6, and often require high amounts of titanium dioxide which can lead to an unnatural appearance.
Innovation Solution
A personal care composition comprising a mineral UV filter component with zinc oxide and an iron oxide system consisting of Fe3O4, FeH3O3, and Fe2O3, with specific weight ratios of FeH3O3 to Fe3O4 and FeH3O3 to Fe2O3, achieving enhanced whitecast values and broad-spectrum protection with a UVAI/UV ratio of greater than or equal to 0.70.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high amounts of titanium dioxide are used to provide broad-spectrum protection, then SPF value is improved, but whitecast increases and cosmetic elegance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by replacing titanium dioxide with zinc oxide as the primary mineral UV filter, and by using a specific ratio of iron oxide compounds (FeH3O3:Fe3O4 = 3.1:6.2, FeH3O3:Fe2O3 = 2.4:5.1). This parameter change achieves broad-spectrum protection while reducing whitecast and improving cosmetic elegance for Fitzpatrick skin types 4-6.
Solution Approach 2:
The patent creates a composite mineral UV filter system combining zinc oxide with a specific mixture of iron oxide compounds (Fe3O4, FeH3O3, and Fe2O3 in defined ratios). This composite material provides synergistic broad-spectrum UV protection while the iron oxide components help reduce the whitecast effect, achieving both protection and cosmetic elegance.
2Reliability
If traditional sunscreen formulations are used to achieve broad-spectrum protection, then UV protection is improved, but whitecast values increase for skin types Fitzpatrick 4, 5, or 6
Solution Approach 1:
The patent modifies the formulation parameters by using zinc oxide instead of titanium dioxide as the base mineral filter, and by incorporating a specific iron oxide system with precise weight ratios (FeH3O3 to Fe3O4 of about 3.1 to about 6.2 and FeH3O3 to Fe2O3 of about 2.4 to about 5.1). These parameter changes reduce whitecast values while maintaining broad-spectrum protection for darker skin types.
Solution Approach 2:
The patent applies local quality by using a targeted iron oxide system with specific compounds and ratios that selectively address the whitecast issue for Fitzpatrick skin types 4-6, while the zinc oxide provides the foundational broad-spectrum protection. The iron oxide components locally modify the optical properties to reduce whitecast in the specific context of darker skin tones.
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 effectively provides a high SPF value of 40 or more and a UVAI/UV ratio of 70 or more, while reducing whitecast, thus offering improved cosmetic elegance and enhanced protection for skin types Fitzpatrick 4, 5, or 6.
Implementation Method 1
a mineral UV filter component comprising a zinc oxide; and an iron oxide system comprising: Fe3O4, FeH3O3, and Fe2O3
Data Source
AI summary
Personal care compositions and, e.g., personal care compositions that achieve enhanced whitecast values for skin types of Fitzpatrick 4, 5, or 6 are disclosed herein. In accordance with an aspect, provided is a personal care composition comprising a mineral UV filter component comprising: a zinc oxide; and an iron oxide system comprising: Fe3O4, FeH3O3, and Fe2O3, wherein the personal care composition has a weight ratio of the FeH3O3 to the Fe3O4 of about 3.1 to about 6.2 and a weight ratio of the FeH3O3 to the Fe2O3 of about 2.4 to about 5.1.