Broad-Spectrum Light Protection Agent Using Composite Glass and Oil
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Solution Overview
Problem
Current cosmetic light protection agents are inadequate in covering a wide wavelength range, particularly failing to effectively prevent skin damage from UV, visible, and infrared radiation, leading to incomplete protection against all harmful light wavelengths.
Innovation Solution
A cosmetic light protection agent comprising methylene bis-benzotriazolyl tetramethylbutylphenol as a UVA filter, UVB filter substances, sea buckthorn oil, infrared-absorbing glass, and radical-scavenging substances, with specific proportions and particle sizes, providing broad-spectrum protection from 250 nm to 1400 nm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional UV filters and monodisperse particles are combined, then UV protection is improved, but protection against visible and infrared radiation remains insufficient
Solution Approach 1:
The patent combines multiple particle materials with different optical properties: TiO2 and ZnO for UV protection, colored glass beads (green, blue, red) for visible light filtration, and iron oxide for infrared absorption. This composite approach creates a single formulation that addresses the full spectrum from UV to infrared, resolving the contradiction between specialized UV protection and broad-spectrum coverage
Solution Approach 2:
The light protection function is segmented into different wavelength-specific components: UV filters (oxybenzone, avobenzone) for 290-400 nm, colored glass beads for 400-700 nm visible range, and iron oxide for infrared >700 nm. Each segment targets a specific portion of the spectrum, allowing the composition to achieve comprehensive coverage by combining specialized segments
2Adaptability or versatility
If multiple filter substances are combined to expand wavelength coverage, then broad-spectrum protection is improved, but the complexity of the formulation increases
Solution Approach 1:
The patent employs materials that serve multiple functions: TiO2 and ZnO provide both physical barrier and UV filtration; colored glass beads simultaneously filter visible light and scatter UV; iron oxide absorbs infrared while providing pigment stability. This multi-functionality reduces the need for separate specialized additives, managing formulation complexity while maintaining broad coverage
Solution Approach 2:
The patent optimizes particle size parameters (0.5-5 μm for glass beads, 1-10 μm for metal oxides) to balance protection efficacy with cosmetic acceptability. By controlling particle size distribution, the formulation achieves effective light blocking while maintaining smooth skin feel and avoid ingesting particles, thus managing complexity through parameter optimization
3Ease of operation
If particle size is reduced to improve skin feel, then cosmetic acceptability is improved, but light absorption efficiency decreases
Solution Approach 1:
The patent identifies an optimal particle size window (0.5-5 μm for glass beads, 1-10 μm for metal oxides) that balances two competing requirements: small enough to provide smooth skin feel and avoid ingestion, but large enough to effectively scatter and absorb light across the UV-visible-infrared spectrum. This parameter optimization resolves the contradiction between cosmetic acceptability and protection efficacy
Solution Approach 2:
The patent uses a composite particle system where different materials (glass beads, TiO2, ZnO, iron oxide) with different refractive indices and absorption properties work together. The glass beads provide bulk scattering for visible light, while metal oxides provide absorption in specific bands, achieving high overall light blocking efficiency even at fine particle sizes that ensure good skin feel
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 combination of these components exhibits unexpectedly high light absorption across the entire wavelength range, significantly preventing skin damage, demonstrating synergistic effects beyond individual component performances.
Implementation Method 1
at least methylene bis-benzotriazolyl tetramethylbutylphenol) as a UVA filter
Implementation Method 2
at least one filter substance for UVB radiation
Implementation Method 3
sea buckthorn oil with a refractive index of 1.4 to 1.59
Implementation Method 4
at least one infrared-absorbing glass
Implementation Method 5
a radical-scavenging substance or mixture of substances
Implementation Method 6
ground ruby or citrine, preferably with a particle size d50 of 5 to 40 μm
Data Source
AI summary
The invention relates to a light protective agent for wavelengths of 250-1400 nm, comprising at least methylene bis-benzotriazolyltetramethylbutylphenol as UVA filter, at least one UVB filter, Sea Buckthorn oil with a refractive index of 1.4 to 1.59 a solid with d50 3-50 µm, selected from citrine, topaz, amethyst, ruby, or glass with a refractive index of 1.500 -1.599 and mixtures thereof, at least one inra-red absorbing glass with d50 5-50 µm, a radical trap and cosmetic adjuncts and/or vehicles and optionally further cosmetic agents. The agent has an unexpectedly high light absortion and largely prevents skin damage by light of wavelength 250 -1400 nm.