Polymeric Sunscreen with Skin-Bonding Adducts
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Solution Overview
Problem
Current sunscreens lack stability and longevity in protecting against UV radiation, often requiring frequent reapplication and posing risks of skin penetration, which can lead to sensitization and allergic reactions due to the photodegradation of UV-absorbing compounds like dibenzoylmethane derivatives.
Innovation Solution
A sunscreen composition featuring a skin bonding polymer adduct with a UV-A absorber, designed to enhance stability and reduce skin penetration by forming a gel matrix on the skin's surface, incorporating amphiphilic polymers and biologically active species that bond to specific skin layers, thereby prolonging protection and preventing rapid degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monomeric UV absorbing compounds are used, then good UV absorption is achieved, but skin penetration risk increases
Solution Approach 1:
The patent employs composite materials by combining UV absorbing compounds with polymer carriers to form polymeric sunscreens. This composite structure allows the UV filters to be embedded within the polymer matrix, preventing their penetration into skin while maintaining their UV absorption capability. The polymer acts as a carrier that delivers the active ingredient to the skin surface without allowing it to penetrate deeper layers.
2Reliability
If UV-A absorbers like dibenzoylmethane derivatives are used, then good UV-A protection is achieved, but photostability deteriorates due to rapid photodegradation
Solution Approach 1:
The patent applies beforehand cushioning by incorporating stabilizing agents and antioxidants into the polymeric sunscreen formulation before application. These additives are designed to prevent or slow down the photodegradation of UV absorbers like dibenzoylmethane derivatives. The polymer matrix itself also provides a protective environment that reduces the rate of photodegradation compared to free monomeric compounds.
3Reliability
If conventional sunscreens are applied, then initial UV protection is achieved, but duration of protection is short requiring frequent reapplication
Solution Approach 1:
The patent implements continuity of useful action through polymeric sunscreens that form a persistent film on the skin surface. The polymer structure provides a reservoir of UV absorbing compounds that are released gradually, maintaining protection over extended periods. The polymeric nature allows for better adherence to skin and resistance to washing off, ensuring continuous protection without frequent reapplication.
4Reliability
If multiple photoactive compounds are combined, then broad spectrum protection is achieved, but bimolecular reactions increase photodegradation rate
Solution Approach 1:
The patent applies segmentation by incorporating multiple UV absorbing compounds into separate polymeric matrices or distinct phases within the sunscreen formulation. This physical separation prevents direct contact and bimolecular reactions between different photoactive compounds while still providing broad spectrum protection. Each polymer phase can contain specific UV filters optimized for particular wavelength ranges, reducing destabilizing interactions.
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 composition provides prolonged protection against UV-A radiation with reduced risk of skin penetration, maintaining a high SPF for an extended period and enhancing the stability of UV-A absorbers, thus requiring less frequent application.
Implementation Method 1
forming a gel matrix on the skin's surface
Implementation Method 2
bond to specific skin layers
Implementation Method 3
UV-A absorber... absorbing radiation
Implementation Method 4
enhance stability... preventing rapid degradation
Data Source
AI summary
Compositions and methods thereof, for preventing or minimizing skin penetration and that promote surface-layer fixation of dermatological molecules in a human body are disclosed. The molecules of the present invention and compositions containing said molecules comprise a tissue-reactive part, an amphiphilic part, a light-functional part and optionally a detachment mechanism for releasing said tissue-reactive part from said light-functional part. The methods include ways of combining the tissue-reactive part, amphiphilic part, light-functional part and optionally synthesizing a detachment mechanism therein. The parts when combined form molecular structures possessing novel photobiological persistence and efficacy.