Sunscreen Formulation Ratios for Metal Oxide Compatibility
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Solution Overview
Problem
Existing sunscreen compositions face challenges in enhancing sun protection factor (SPF) properties due to limitations in approved sunscreen active agents and compatibility issues with metal oxides like titanium dioxide and zinc oxide.
Innovation Solution
Formulations comprising specific weight ratios of octocrylene, octinoxate, octisalate, and homosalate, either alone or in combination with metal oxides such as zinc oxide and titanium dioxide, to achieve improved SPF protection for keratinous materials like skin and hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more sunscreen active agents are used to increase SPF, then sun protection factor improves, but compatibility issues with metal oxides arise
Solution Approach 1:
The patent changes the concentration parameters and ratios of specific sunscreen active agents (octocrylene, octinoxate, octisalate, homosalate) to achieve optimal compatibility with metal oxides while maintaining high SPF. By precisely controlling the weight ratios between these agents, the formulation achieves both high sun protection and stability with titanium dioxide and zinc oxide.
Solution Approach 2:
The patent creates a composite sunscreen formulation combining multiple organic active agents (octocrylene, octinoxate, octisalate, homosalate) with metal oxides (titanium dioxide, zinc oxide) in specific ratios. This composite approach allows synergistic effects where the organic agents enhance UV protection while the metal oxides provide physical blocking, and the specific ratios ensure compatibility between the different material types.
2Reliability
If existing approved sunscreen active agents are combined to increase SPF, then sun protection improves, but formulation stability decreases
Solution Approach 1:
The patent optimizes the concentration parameters and interaction ratios between multiple sunscreen active agents to achieve both high SPF and formulation stability. By controlling the weight ratios of octocrylene to homosalate (3:1 to 4.5:1), octinoxate to octisalate (1.5:1 to 1:1.5), and other combinations, the formulation maintains stability while providing enhanced sun protection.
Solution Approach 2:
The patent uses specific intermediary ratios and combinations of sunscreen agents that act as mediators between the different active ingredients, allowing them to work together synergistically without causing instability. The specific ratio ranges provided in the patent serve as intermediary guidelines that enable stable formulation while achieving high SPF.
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 described formulations provide broad-spectrum protection against UVA and UVB rays, increasing SPF values effectively while avoiding compatibility issues with certain metal oxides, thus enhancing the sun protection offered by sunscreen compositions.
Implementation Method 1
Sunscreen active agents in such compositions protect keratinous material such as hair and skin from the harm caused by UV radiation, including harm from both UVA and UVB rays
Implementation Method 2
compositions containing sunscreen active agents and metal oxides
Implementation Method 3
compositions containing sunscreen active agents and metal oxides
Data Source
AI summary
Compositions containing octocrylene, octinoxate, octisalate, homosalate and having improved sun protection factor (SPF) properties, as well as methods of improving sun protection factor (SPF) properties of compositions, are provided.