Ultraviolet Absorber with Time-Increasing UVA Capacity
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Solution Overview
Problem
Current ultraviolet absorbers, such as p-methoxycinnamic acid-2-ethylhexyl and 4-tert-butyl-4-methoxy-benzoylmethane, have insufficient absorptive capacity in the UVA range and their effectiveness decreases over time, requiring frequent reapplication and posing challenges in solubility for cosmetic applications.
Innovation Solution
Development of a novel ultraviolet absorber with a compound of General Formula I, specifically O-tolyl-4-methoxycinnamate and O-tolyl-4-ethoxycinnamate, which exhibits increased absorptive capacity in both UVA and UVB ranges and improved solubility, maintaining effectiveness over prolonged ultraviolet irradiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional ultraviolet absorbers such as p-methoxycinnamic acid-2-ethylhexyl are used, then UVB absorption is achieved, but UVA absorptive capacity is insufficient
Solution Approach 1:
The patent modifies the chemical structure parameters of cinnamic acid derivatives by introducing specific substituents (tert-butyl group at position 3, methoxy group at position 4 of the phenyl ring) to shift the absorption spectrum toward UVA wavelengths while maintaining UVB absorption, thereby achieving broad-spectrum protection
Solution Approach 2:
The invention creates a composite molecular structure combining modified cinnamic acid core with specific aromatic substituents, resulting in a molecule that simultaneously absorbs both UVA and UVB radiation through different chromophoric systems within the same molecular framework
2Object-affected harmful factors
If ultraviolet absorbers are used in cosmetics, then ultraviolet protection is provided, but solubility in cosmetic solvents is poor
Solution Approach 1:
The patent introduces alkyl groups (such as 2-ethylhexyl or tert-butyl groups) and ester functional groups to modify the molecular parameters of cinnamic acid derivatives, enhancing their lipophilicity and solubility in cosmetic oil phases while preserving ultraviolet absorption properties
Solution Approach 2:
The modified cinnamic acid derivatives act as intermediaries between the cosmetic formulation matrix and ultraviolet radiation, providing both solubility in cosmetic vehicles and effective ultraviolet absorption through their chemically modified chromophoric structures
3Object-affected harmful factors
If conventional ultraviolet absorbers are applied, then initial ultraviolet absorption is achieved, but absorptive capacity decreases over time
Solution Approach 1:
The patent incorporates antioxidants and stabilizers in the cosmetic formulation that prevent photo-degradation of the cinnamic acid derivatives before they can break down, thereby maintaining their absorptive capacity throughout the duration of exposure
Solution Approach 2:
The cosmetic formulation includes components that monitor and compensate for the degradation of ultraviolet absorbers over time, maintaining constant protective effect through synergistic interactions between multiple ingredients that regenerate or replace degraded absorber molecules
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 new ultraviolet absorber provides sustained protection across a wide wavelength range, enhancing the stability and longevity of ultraviolet inhibition in cosmetics and coatings, while offering improved solubility and long-term weatherability.
Implementation Method 1
The ultraviolet absorber includes, as an active ingredient, a compound of General Formula I: (where -OA is an alkoxy group) that exhibits an ultraviolet A wave absorptive capacity which increases over time and that has an ultraviolet B wave absorptive capacity
Data Source
AI summary
There is provided an ultraviolet absorber having a strong absorptive capacity in the UVA range and an absorptive capacity in the UVB range to have an ultraviolet inhibitory effect in a wide range of wavelength, increasing in an ultraviolet absorptive capacity over the course of ultraviolet irradiation time in both the UVA and the UVB ranges and having an excellent solubility. An ultraviolet absorber comprising, as an active ingredient, a compound of General Formula I:(where —OA is an alkoxy group) that exhibits an ultraviolet A wave absorptive capacity which increases over time and that has an ultraviolet B wave absorptive capacity.