Sunscreen Composition for BMDBM Photostability Without Octocrylene

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Solution Overview

Problem

Butyl Methoxydibenzoylmethane (BMDBM) is not UV radiation stable and breaks down when combined with other filters, losing its photoprotective properties, and octocrylene, a common stabilizer, is a powerful allergen.

Innovation Solution

A photostabilized combination of Butyl Methoxydibenzoylmethane (BMDBM), Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (BEMT), and Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (MBBT) is formulated with specific mass ratios and concentrations, excluding octocrylene and PABA, to enhance photostability and broad UV protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If BMDBM is combined with other sunscreen filters to enhance photoprotection, then UV protection coverage is improved, but BMDBM breaks down and loses its photoprotective properties

Engineering Contradiction:

Improvephotoprotective propertiesVSAvoidUV radiation stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Octocrylene acts as a mediator between BMDBM and other sunscreen filters, absorbing excess energy and preventing BMDBM degradation. The patent specifies combining BMDBM with octocrylene at specific concentration ratios to achieve photostabilization while maintaining broad-spectrum protection.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention creates a composite sunscreen system combining multiple filters (BMDBM, octocrylene, and other UV filters) with specific concentration ratios. This composite approach leverages the photostabilizing effect of octocrylene while maintaining the high UV absorption capability of BMDBM, achieving both protection reliability and compositional stability.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If octocrylene is used to photostabilize BMDBM, then photostability is improved, but allergenicity increases due to octocrylene being a powerful allergen

Engineering Contradiction:

ImprovephotostabilityVSAvoidallergenicity

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent optimizes the concentration parameters of octocrylene and BMDBM to achieve photostabilization at the lowest effective levels. By carefully controlling the ratio and absolute amounts of these components, the formulation maintains photostability while minimizing the allergenic load from octocrylene.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a localized photostabilization effect where octocrylene is strategically positioned and concentrated near BMDBM molecules to provide stabilization only where needed. This localized approach reduces the overall amount of octocrylene required in the formulation, thereby reducing allergenicity while maintaining photostability.

Inventive Principle:

Principle #3Local quality

3Reliability

If BMDBM concentration is increased to enhance UV protection, then photoprotective efficacy is improved, but photodegradation accelerates and stability decreases

Engineering Contradiction:

Improvephotoprotective efficacyVSAvoidphotostability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

Octocrylene serves as a counterweight to BMDBM photodegradation. By incorporating octocrylene at specific concentrations, the formulation creates a balancing effect where octocrylene absorbs excess photonic energy and prevents it from degrading BMDBM, allowing higher BMDBM concentrations to be used stably.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The patent implements a preemptive stabilization strategy where octocrylene is included in the formulation before exposure to UV radiation. This pre-positioned stabilizer acts as a cushion against potential BMDBM degradation, protecting the photoprotective efficacy even at higher BMDBM concentrations during subsequent sun exposure.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

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 combination maintains at least 80-90% SPF and UVA protection after irradiation, achieving a broad UV absorption spectrum and compliance with current regulations, without using allergenic stabilizers.

Implementation Method 1

Butyl Methoxydibenzoylmethane (BMDBM) is not a UV radiation stable filter. A cleavage of the molecule takes place, which breaks down into various chemical elements with no absorbent activity.

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentEP3299009B1Composition and association of sunscreens for photostabilizing butyl methoxydibenzoylmethane (BMDBM)

Publication Date: 2025.08.13 PIERRE FABRE DERMO COSMETIQUE SA

AI summary

The present invention concerns a composition containing a photostabilized combination of Butyl Methoxydibenzoylmethane (BMDBM), Bis-Ethylhexyloxyphenol Methoxyphenyl Triazine (BEMT), and Methylene Bis-Benzotriazolyl Tetramethylbutylphenol (MBBT) wherein: i. the BEMT/BMDBM mass ratio is greater than or equal to 1 and preferably greater than or equal to 1.5, ii. the content of BMDBM is comprised between 1% and 5% by weight with regard to the total weight of the composition, iii. the quantity of MBBT is comprised between 3% and 7% by weight with regard to the total weight of the composition, said combination containing no octocrylene, PABA or ethylhexyl methoxycinnamate, and a pharmaceutically or cosmetically acceptable excipient.