Particle Matrix Sunscreen Composition for Broad UV Protection
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Solution Overview
Problem
Existing sunscreens face challenges in achieving stability, broad-spectrum efficacy, effective incorporation of active ingredients, cosmetic elegance, and resistance to water exposure while avoiding undesirable aesthetic characteristics such as a white cast or greasiness.
Innovation Solution
Formulations comprising a structurally diverse matrix of photoprotective particles, including various types of primary particles and agglomerates, with specific size and composition distributions, ensuring minimal particles under 100 nm and optimized ratios of metal oxide and styrene acrylate copolymer particles, enhance UV protection and cosmetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of metal oxide particles are used to achieve broad-spectrum UV protection, then UV protection efficacy is improved, but cosmetic elegance deteriorates due to white cast and greasiness
Solution Approach 1:
The patent segments the particle population into distinct size classes (microscale 0.01-10 μm, mesoscale 10-100 μm, macroscale 100-1000 μm) with different functional roles. Microscale particles provide UV protection, while larger particles provide structural support and reduce white cast. This segmentation allows optimized UV protection without excessive white cast and greasiness.
Solution Approach 2:
The patent applies local quality by using different particle sizes in different functional zones. Smaller microscale particles are concentrated in regions requiring UV protection, while larger mesoscale and macroscale particles are distributed to reduce white cast and improve spreadability. The styrene acrylate copolymer particles are strategically distributed to modify local surface properties and reduce greasiness.
2Reliability
If diverse particle sizes and shapes are incorporated to improve UV protection and cosmetic appearance, then broad-spectrum protection is improved, but formulation stability deteriorates
Solution Approach 1:
The patent creates a composite particle system combining metal oxide particles (zinc oxide, titanium dioxide) with styrene acrylate copolymer particles. This composite structure allows the metal oxides to provide UV protection while the polymer particles stabilize the formulation, prevent aggregation, and improve spreadability. The composite nature maintains stability despite diverse particle sizes and shapes.
3Reliability
If effective incorporation of active ingredients is achieved through optimized particle ratios, then UV protection is improved, but ease of manufacture deteriorates
Solution Approach 1:
The patent optimizes manufacturing by controlling key parameters: particle size distributions (microscale 0.01-10 μm, mesoscale 10-100 μm, macroscale 100-1000 μm), particle concentration ratios (metal oxide to styrene acrylate copolymer), and aggregation states. These parameter optimizations enable effective UV protection while maintaining ease of manufacture through standard cosmetic formulation processes.
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 provides high SPF, broad-spectrum protection, improved spreadability, and a cosmetically elegant finish without a white cast, while maintaining stability and water resistance.
Implementation Method 1
comprising a matrix of photoprotective particles, which offer advanced protection from UV radiation
Implementation Method 2
a mixture of structurally diverse matrix particles... formed from at least three, four, or five different types of primary particles
Implementation Method 3
that comprise or more types of matrix particle agglomerates... at least 25% of the second particle population being composed of UV protective particles that are at least mostly composed of styrene acrylate copolymer
Data Source
AI summary
Matrix compositions suitable for topical administration comprising structurally diverse matrix particles formed from at least three different types of primary particle populations where (1) the first primary particle population has an average particle size from 1000 nm to 8500 nm, makes up 4-9% of the composition by weight, and 20-70% of the first primary particle population comprises a glass composition, (2) the second particle population has an average particle size from 250 nm to 500 nm, makes up 5-15% of the composition by weight and comprises UV-protective particles, and (3) the third particle population has an average particle size from 500 nm to 1000 nm, makes up 6.75-22% of the composition by weight, and at least 75% of the third particle population comprises UV-protective metal oxide particles, and the composition exhibits one or more of sun protection factor (SPF) of at least 30, a critical wavelength of at least 370 nm, UVA/UVB ratio of at least 0.333, and a UVA1 to UV ratio of at least 0.7.