UV Absorbing Compounds for Broad-Spectrum Protection
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Solution Overview
Problem
Existing UV absorbing compounds, particularly those based on a cyclic enaminoketone core, lack variance in absorbance maximum, primarily limiting their effectiveness in providing broad-spectrum UV protection, especially in the UVA range.
Innovation Solution
Substitution of the cyclic enaminoketone core with a range of groups that affect electron density or provide additional UV absorbance characteristics, leading to compounds with extended absorbance maxima into the UVA range, such as those described by specific chemical formulas and structures, which can be used in sunscreen compositions, coatings, and protective applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If substitution around the cyclic enaminoketone core is limited to simple alkyl chains and carbonyl groups, then the compound structure is simple and easy to manufacture, but the absorbance maximum remains narrow and limited to UVB range (305-308 nm)
Solution Approach 1:
The patent applies parameter changes by systematically varying substituent types (aryl, heteroaryl, alkyl, cycloalkyl), their positions (2-, 3-, 6-positions of the enaminoketone ring), and their electronic properties (electron-donating, electron-withdrawing groups). These parameter changes in molecular structure directly extend the absorbance maximum from UVB (305-308 nm) into UVA range (320-380 nm), resolving the contradiction between manufacturing simplicity and absorbance versatility.
Solution Approach 2:
The patent creates composite molecular structures by combining the cyclic enaminoketone core with diverse substituent groups (aryl, heteroaryl, alkyl, cycloalkyl) to form hybrid compounds. This composite approach allows the base structure to maintain UVB absorption while added substituents contribute additional absorption characteristics, achieving broad-spectrum UV protection while keeping the synthesis route relatively straightforward.
2Adaptability or versatility
If diverse substitutions are introduced around the cyclic enaminoketone core to extend absorbance into UVA range, then the UV protection capability is improved, but the compound structure becomes more complex
Solution Approach 1:
The patent systematically changes molecular parameters including substituent type (aryl, heteroaryl, alkyl, cycloalkyl), substitution position (2-, 3-, 6-positions), and electronic properties. These controlled parameter changes extend absorbance into UVA range while maintaining reasonable structural complexity through methodical modification rather than random complexity increase.
Solution Approach 2:
The patent segments the molecular structure into distinct functional components: the cyclic enaminoketone core provides UVB absorption, while separate substituent groups (aryl, heteroaryl, alkyl, cycloalkyl) attached at specific positions contribute UVA absorption. This segmentation allows each component to be optimized independently for its absorption range, achieving broad-spectrum protection with manageable structural complexity.
3Device complexity
If the enaminoketone chromophore is used without modification, then the compound structure is simple, but the absorbance maximum cannot be extended into UVA range
Solution Approach 1:
The patent modifies the unmodified enaminoketone chromophore by changing parameters such as adding aryl, heteroaryl, alkyl, and cycloalkyl substituents at specific positions (2-, 3-, 6-positions). These parameter changes extend the absorbance maximum from 307 nm (UVB only) into UVA range (320-380 nm) while maintaining the core chromophore structure for recognition and stability.
Solution Approach 2:
The patent performs preliminary structural modification of the enaminoketone core by pre-installing specific substituent groups (aryl, heteroaryl, alkyl, cycloalkyl) at strategic positions before final compound formation. This preliminary action ensures the extended conjugation and electron density distribution needed for UVA absorption is built into the molecular framework from the outset, rather than requiring post-synthesis modification.
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 modified compounds offer enhanced UV protection by extending the absorbance range, providing greater variance in absorption capabilities and improved protection against both UVA and UVB radiation.
Implementation Method 1
UV absorbing compounds have found use in a range of applications where protection from the sun's harmful UV rays is desirable
Implementation Method 2
substitution of a cyclic enaminoketone core with a range of groups which are likely to either affect the electron density of the enaminoketone or which will provide additional UV absorbance characteristics themselves will result in extending the absorbance maximum into the UVA range
Data Source
AI summary
There is provided a range of novel compounds which have been demonstrated to have useful UV absorbing properties. These compounds will find use in a range of applications such as active components in sunscreen formulations, paints, plastics, fabrics, glass and UV protective coatings.