Polymeric Hydroxy Phenyl Triazine UV Filter Photostability

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Solution Overview

Problem

Current sunscreen compositions face challenges in providing efficient and photostable UV-A and UV-B protection, as existing UV filters tend to isomerize upon UV irradiation, leading to a loss of protective properties and the need for additional stabilizers.

Innovation Solution

The composition combines polymeric or oligomeric hydroxy phenyl triazine UV filters with additional UV filters, such as organic UV-A, UV-B, or broad spectrum filters, to enhance UV-A and UV-B protection and improve photostability, specifically using compounds like micronized phenylene bis-diphenyltriazine and ethylhexyl methoxycinnamate, which are selected for their stability and protective efficacy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional UV filters are used to provide UV protection, then UV-A and UV-B protection is achieved, but the filters tend to isomerize upon UV irradiation causing loss of protective properties

Engineering Contradiction:

Improveprotective propertiesVSAvoidphotostability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent uses polymeric or oligomeric hydroxy phenyl triazine UV filters as stabilizing intermediaries that protect additional UV filters from isomerization. The triazine compounds act as a mediator between UV radiation and other UV filters, absorbing harmful radiation and preventing degradation of co-formulated UV filters, thereby maintaining their protective properties throughout the product shelf life and during use.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite UV filter system by combining polymeric or oligomeric hydroxy phenyl triazine compounds with additional UV filters (such as cinnamates, benzophenones, or avobenzone). This composite approach leverages the photostability of triazines to enhance the overall stability and performance of the UV protection system, allowing the use of effective but less stable UV filters while maintaining reliable protection.

Inventive Principle:

Principle #40Composite materials

2Reliability

If multiple UV filters are combined to achieve high SPF and UV-A protection factor, then efficient UV protection is improved, but the complexity of the composition increases

Engineering Contradiction:

ImproveUV protection efficacyVSAvoidcomposition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The polymeric or oligomeric hydroxy phenyl triazine UV filters serve multiple functions simultaneously: they provide direct UV-A and UV-B protection, act as photostabilizers for co-formulated UV filters, and function as sunscreen agents themselves. This multi-functionality reduces the need for separate stabilizer ingredients, simplifying the overall composition while maintaining high SPF and UV-A protection factor.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Object-affected harmful factors

If UV filters are used to block UV radiation, then protection against sunburn and skin cancer is achieved, but the filters may cause phototoxic or photo allergenic reactions

Engineering Contradiction:

ImproveUV radiation damageVSAvoidphototoxic reactions

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent converts the potential harm of UV filter photodegradation into a benefit by using polymeric or oligomeric hydroxy phenyl triazine compounds that are highly photostable. These compounds absorb UV radiation effectively while resisting degradation, thereby preventing the formation of phototoxic degradation products. The triazine structure itself acts as a protective agent that eliminates the harmful side effects associated with less stable UV filters.

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

This combination achieves a high sun protection factor (SPF) of at least 30 and UV-A protection factor of at least 10, with improved photostability, ensuring effective protection against UV radiation while maintaining stability under irradiation.

Implementation Method 1

UV filters are either organic or inorganic, particulate or non-particulate compounds, of which all have a high absorption efficacy in the UV-light range

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Implementation Method 2

To protect the human skin from UV radiation, various sun protecting UV filters (also referred to as UV absorbers) exist including UV-A filter, UV-B filter and broadband filters

Methodology Applied

Scientific EffectUV filtration: Filter (optical)

Data Source

PatentEP4037654B1Compositions with polymeric or oligomeric hydroxy phenyl triazine UV filter

Publication Date: 2024.10.30 BASF SE

AI summary

The present invention relates to compositions comprising at least one polymeric or oligomeric hydroxy phenyl triazine UV filter and at least one additional UV filter. Furthermore, the present invention relates to the use of at least one polymeric or oligomeric hydroxy phenyl triazine UV filter for improving the photostability of a sunscreen composition comprising at least one additional UV filter.