Solid UV Filters with Heptanediols for Solubility
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Solution Overview
Problem
Existing sunscreen compositions face challenges in achieving high Sun Protection Factor (SPF) while maintaining low solid UV filter concentrations to avoid high costs and compromised solubility, leading to recrystallization and poor sensory properties.
Innovation Solution
Incorporating 1,2-heptanediol, 2,3-heptanediol, or a mixture of specific alkanediols with solid UV filters improves solubility and stability, preventing recrystallization, and enhances skin sensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high levels of UVA and UVB sunscreens are incorporated to achieve high SPF, then UV protection efficacy is improved, but the cost of the composition increases and sensory properties are compromised
Solution Approach 1:
The patent uses solid UV filters as intermediary substances that provide UV protection through physical absorption rather than relying on high concentrations of conventional liquid sunscreens. This mediator approach allows achieving high SPF while avoiding the sensory drawbacks associated with high levels of traditional sunscreen agents.
Solution Approach 2:
The invention changes the physical state parameter of UV filters from liquid to solid form. This parameter change enables the use of UV filters in a different phase that provides protection without the sensory issues (greasiness, residue) associated with high concentrations of liquid sunscreen agents.
2Reliability
If high levels of sunscreens are incorporated to achieve high SPF, then UV protection efficacy is improved, but the total amount of sunscreens must be kept relatively low to maintain sensory properties
Solution Approach 1:
The patent changes the concentration parameter by using solid UV filters that provide equivalent or superior protection at lower quantities compared to liquid sunscreen agents. This parameter change resolves the contradiction between achieving high SPF and minimizing the total amount of sunscreen substances.
Solution Approach 2:
The invention creates a composite formulation combining solid UV filters with cosmetic ingredients. This composite approach allows achieving high SPF protection while maintaining low overall sunscreen content, as the solid filters provide intense protection per unit mass.
3Stability of the object's composition
If solid UV filters with melting points above 40°C are used, then stability and storability are improved, but solubility is compromised leading to recrystallization
Solution Approach 1:
The patent changes the temperature parameter by formulating the composition to maintain the solid UV filters in a melted or softened state during application. This parameter change allows the insoluble solid filters to become sufficiently soluble at application temperature while maintaining their stability and preventing recrystallization during storage.
Solution Approach 2:
The invention addresses the solubility problem by introducing a temperature dimension to the formulation. The solid UV filters are designed to be stable at storage temperatures but become soluble when the composition is warmed to application temperature, thus resolving the contradiction between stability and solubility through dimensional change.
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 addition of alkanediols results in stable sunscreen formulations with improved solubility and sensory properties, maintaining UV filter availability and reducing greasy feel.
Implementation Method 1
Incorporating 1,2-heptanediol, 2,3-heptanediol, or a mixture of specific alkanediols with solid UV filters improves solubility and stability, preventing recrystallization
Implementation Method 2
UV filters are compounds which have a pronounced absorption capacity for ultraviolet radiation
Data Source
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AI summary
The present invention refers in general to the area of sun care products and relates in particular to a cosmetic or pharmaceutical, in particular dermatological, composition or a homecare product comprising or consisting of a solid UV filter and an effective amount of 1,2-heptanediol and/or 2,3-heptanediol or of a specific alkanediol or a mixture of two or more different specific alkanediols and the use of said compositions as a cosmetic, for personal care, as a pharmaceutical, for animal care or as a homecare product. Additionally, the present invention relates to the use of 1,2-heptanediol and/or 2,3-heptanediol or of a specific alkanediol or a mixture of two or more different specific alkanediols for improving the solubility of a solid UV filter, and/or for improving the availability of a solid UV filter in a cosmetic or pharmaceutical composition or homecare product.