Silyl Polymeric Benzoic Acid Esters for UV Protection

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Solution Overview

Problem

Conventional sunscreens using monomeric UV filters often penetrate the skin, leading to adverse reactions, irritation, and increased sensitivity, especially in individuals with preexisting skin conditions, and their degradation products can induce further issues under sunlight exposure.

Innovation Solution

Development of silyl polymeric benzoic acid ester compounds in micro- or nanoparticle form, which are hermetically sealed to prevent release and phototransformation, offering progressive photoprotection that increases with sun exposure and radiation intensity, and can be photochemically converted to enhance UV protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If monomeric UV filters are used in sunscreen compositions, then UV protection is provided, but skin penetration occurs leading to adverse reactions and irritation

Engineering Contradiction:

ImproveUV protection efficacyVSAvoidskin penetration and adverse reactions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The UV filter compound is segmented into multiple polymeric units forming a larger molecular structure. This segmentation increases the molecular weight and size, preventing skin penetration while maintaining UV absorption capability through the distributed chromophore units along the polymer chain

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention creates a composite structure combining the UV-absorbing benzoic acid ester moieties with a polymeric backbone containing siloxane or carbon-based chains. This composite approach integrates the UV filtering function with the skin-safe polymeric matrix, achieving both protection and biocompatibility

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If polysiloxane UV filters are used to reduce skin penetration risk, then skin safety improves, but incompatibility problems arise in sunscreen compositions

Engineering Contradiction:

Improveskin penetration riskVSAvoidcompositional compatibility

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The polymer structure incorporates localized hydrophobic and hydrophilic segments, allowing different regions of the polymer to interact with various formulation components. This local quality variation enables compatibility with both oil-phase and water-phase ingredients in sunscreen compositions

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The invention modifies the polymer parameters by varying the ratio of polymeric units with different side chains (alkyl, alkoxy, aryl groups) and adjusting the molecular weight. These parameter changes tune the compatibility profile to match different sunscreen formulation bases

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional sunscreen compounds are used, then initial UV protection is provided, but degradation products are formed upon sunlight exposure causing further skin problems

Engineering Contradiction:

Improveinitial UV protectionVSAvoiddegradation products

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The photostable polymeric structure is designed in advance to resist photodegradation. The robust polymer backbone and stable chromophore integration prevent breakdown into harmful fragments, eliminating the need for post-degradation remediation

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention converts the potential harm of photodegradation into a benefit by designing a polymer that undergoes beneficial phototransformation. The polymeric UV filter can convert to an isomer or tautomer upon UV exposure that maintains or enhances UV absorption while eliminating the formation of harmful degradation products

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 silyl polymeric benzoic acid ester compounds provide safer, long-lasting, and enhanced UV protection with reduced skin penetration and environmental impact, minimizing adverse reactions and improving sunscreen efficacy over time and radiation exposure.

Implementation Method 1

can be photochemically converted to enhance UV protection

Methodology Applied

Scientific EffectPhotochemical conversion: Photo-oxidation

Implementation Method 2

provide safer, long-lasting, and enhanced UV protection

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentUS10328017B2Silyl polymeric benzoic acid ester compounds, uses, and compositions thereof

Publication Date: 2019.06.25 ROKA FURADADA SL

AI summary

The present invention relates to organosilicon polymers containing benzoic acid esters in form of particles, process for their preparation, cosmetic or dermatological composition comprising them, as well as their use for protecting a human or animal living body from UV radiation.