Liquid UV Filter Blend for Stable Sun Protection
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Solution Overview
Problem
Current sun care products face challenges with solid UVA-filters like Avobenzone and Bemotrizinol, which have high melting points, leading to poor solubility and increased manufacturing costs due to the need for energy-intensive heating processes, and existing mixtures often compromise on flexibility with auxiliary ingredients or photostability.
Innovation Solution
A liquid and transparent blend of UVA and UVB filters, specifically combining Avobenzone and Bemotrizinol with Octocrylene, Homosalate, and Octisalate, which is stable at ambient temperatures, does not recrystallize, and provides enhanced photostability, allowing for higher SPF and improved skin feel without the need for heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid UVA filters with high melting points are used, then UVA protection is achieved, but solubility is poor and manufacturing requires energy-intensive heating
Solution Approach 1:
The patent changes the physical state parameter of UVA filters from solid to liquid form. By selecting liquid UVA filters with lower melting points or replacing solid filters entirely, the formulation eliminates the need for high-temperature heating during manufacturing while maintaining effective UVA protection. This parameter change directly resolves the contradiction between achieving reliable UVA protection and reducing manufacturing energy consumption.
2Reliability
If solid UVA filters are used, then UVA protection is achieved, but solubility in the formulation is poor
Solution Approach 1:
The patent changes the physical state parameter from solid to liquid, improving solubility and homogeneity in the formulation. Liquid UVA filters mix more uniformly with other formulation ingredients, eliminating precipitation and stability issues associated with solid filters. This resolves the contradiction between achieving reliable UVA protection and maintaining stable, homogeneous composition.
3Ease of manufacture
If existing UV filter mixtures are used, then manufacturing is simplified, but flexibility with auxiliary ingredients is compromised
Solution Approach 1:
The patent combines multiple individual UV filter ingredients into a single integrated liquid blend formulation. This merged product maintains the benefits of simplified manufacturing (like pre-mixed filters) while preserving full formulation flexibility, as the liquid components can be freely combined with various auxiliary ingredients without the constraints of pre-formulated solid mixtures. The merging principle resolves the contradiction between manufacturing ease and formulation versatility.
4Ease of manufacture
If existing UV filter mixtures are used, then manufacturing is simplified, but photostability is compromised
Solution Approach 1:
The patent changes the chemical composition parameters by selecting specific liquid UV filter ingredients with inherent photostability properties. By carefully choosing liquid filters and their concentrations, the formulation achieves superior photostability compared to existing mixtures, while maintaining manufacturing simplicity. This parameter optimization resolves the contradiction between ease of manufacture and photostability reliability.
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 blend offers a higher sun protection factor, improved photostability, and a dry, lightweight skin feel, while maintaining stability and compliance with regulatory limits, reducing manufacturing costs and enhancing product performance.
Implementation Method 1
at least one solid UVA filter dissolved in at least one liquid UVB filter
Implementation Method 2
UV absorbers are compounds which have a pronounced absorption capacity for ultraviolet radiation
Data Source
AI summary
Suggested is a liquid and transparent blend of UV filters, comprising, consisting or essentially consisting of (a) at least one solid UVA filter dissolved in (b) at least one liquid UVB filter exhibiting a linear UV absorbance curve with a variance of +/â10% in the range of 290 to 360 nm as measured from a solution containing 10 mg/l of said mixture in ethanol, wherein said solid UVA filters are selected from the group consisting of Avobenzone, Bemotrizinol and mixtures thereof.