Hydroxy Cinnamate Silanol Adduct Coated Sunscreen Agents
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing sunscreen agents, particularly organic ones, face issues with photostability and skin irritation, and there is a limit to how much metal oxide particles can be suspended in sunscreen compositions to enhance the sun protective factor (SPF) effectively.
Innovation Solution
Micronized metal oxide particles, such as zinc oxide and titanium dioxide, are coated with an adduct of hydroxy cinnamate and silanol, with a relative weight ratio of 1:200 to 1:4, to enhance SPF while maintaining a constant level of metal oxide particles, and are combined with a dermatologically acceptable carrier in specific ratios to create ultraviolet radiation sun protective compositions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more metal oxide particles are added to increase SPF, then sun protection effectiveness is improved, but formulation space is limited and product complexity increases
Solution Approach 1:
The patent applies composite materials by coating metal oxide particles with a multi-layer system consisting of a polymeric film containing hydroxy cinnamate molecules and a silane-based adhesion promoter. This composite structure allows the coating to provide enhanced UV absorption (improving sun protection effectiveness) while maintaining a thin profile that does not excessively increase formulation space requirements.
Solution Approach 2:
The patent changes the parameter of particle surface properties by applying the coated metal oxide particles with modified surface characteristics. The coating alters the optical properties and surface chemistry of the particles, enabling enhanced SPF protection without proportionally increasing the quantity of substance needed, thus resolving the contradiction between protection effectiveness and formulation space.
2Adaptability or versatility
If organic sunscreen agents are used to address UVA and UVB radiation, then spectrum coverage is improved, but photostability deteriorates and skin irritation increases
Solution Approach 1:
The patent uses hydroxy cinnamate molecules as intermediary substances that absorb UV radiation and transfer the energy harmlessly. These molecules act as intermediaries between the metal oxide particles and UV radiation, providing broad spectrum coverage (UVA and UVB) while the metal oxide core provides photostability, thus resolving the contradiction between spectrum coverage and photostability.
Solution Approach 2:
The coated metal oxide particles represent a composite material system where the metal oxide core provides photostability and the hydroxy cinnamate-containing polymeric film provides broad spectrum UV absorption. This composite structure combines the advantages of both materials, achieving both spectrum coverage and photostability simultaneously.
3Reliability
If hydroxy cinnamate and silanol adduct coating is applied to metal oxide particles, then SPF is enhanced without increasing particle amount, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-forming the adduct of hydroxy cinnamate and silanol before the coating process. This pre-prepared adduct simplifies the subsequent coating operation, as it combines multiple functional components (UV-absorbing hydroxy cinnamate and adhesion-promoting silanol) into a single reagent that can be applied in one step, thereby reducing overall manufacturing complexity while achieving enhanced SPF.
Solution Approach 2:
The silanol adduct acts as an intermediary substance that facilitates the bonding between the polymeric film and the metal oxide particle surface. This intermediary compound simplifies the manufacturing process by providing a pre-formed adhesion promoter that integrates the UV-absorbing hydroxy cinnamate with the surface-active silanol group, reducing the need for separate application steps.
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 coated metal oxide particles significantly enhance the SPF of sunscreen compositions, providing improved photostability and reducing skin irritation, allowing for increased protection against UV radiation without increasing the amount of metal oxide particles.
Implementation Method 1
Ultraviolet segments of sunlight are known to accelerate photo aging of the human dermis... micronized zinc oxide and microfine titanium oxide have been shown to deflect ultraviolet radiation of both UVA and UVB type... coated with an adduct of a hydroxy cinnamate and a silanol
Implementation Method 2
micronized zinc oxide and microfine titanium oxide have been shown to deflect ultraviolet radiation of both UVA and UVB type
Implementation Method 3
micronized zinc oxide and microfine titanium oxide have been shown to deflect ultraviolet radiation of both UVA and UVB type
Data Source
AI summary
Ultraviolet radiation sun protective compositions are reported which feature micronized metal oxide inorganic particles selected from zinc oxide, titanium dioxide and mixtures thereof, the inorganic particles being coated with an adduct of a hydroxy cinnamate and a silanol, amounts of the adduct to the inorganic particles being in a relative weight ratio of 1:200 to 1:4.