BEMT Sunscreen Composition With Film Formers to Reduce Soaping

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Solution Overview

Problem

Sunscreens containing bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) exhibit a soaping effect, leading to a less appealing skin feel and reduced consumer compliance with recommended application amounts, which compromises UV protection.

Innovation Solution

Formulating sunscreens with bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) in combination with citrate crosspolymers or polyamides, specifically polyamide-8, and alkanediols like 1,3-propanediol and butylene glycol, while excluding octocrylene, ethylhexyl triazone, and ethylhexyl methoxycinnamate, to reduce the soaping effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If BEMT is used as UV filter, then UV protection is improved, but soaping effect increases

Engineering Contradiction:
ImproveUV protectionVSAvoidsoaping effect
Core Design Contradiction:
ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent introduces citrate crosspolymers and polyamides as intermediary substances that mediate between BEMT and the skin. These film-forming agents create a protective film that prevents the direct interaction between BEMT and skin that causes soaping, while still allowing UV protection to function effectively.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite sunscreen formulation by combining BEMT with citrate crosspolymers and polyamides. This composite approach allows the formulation to benefit from BEMT's superior UV absorption while the polymer components provide film-forming properties that eliminate the soaping effect.

Inventive Principle:
Principle #40Composite materials

2Object-generated harmful factors

If soaping effect is reduced by using less sunscreen, then skin feel is improved, but UV protection is compromised

Engineering Contradiction:
Improvesoaping effectVSAvoidUV protection
Core Design Contradiction:
Object-generated harmful factorsVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters of the sunscreen by incorporating specific film-forming agents (citrate crosspolymers and polyamides) at optimized concentrations. This allows maintaining or increasing application amount without experiencing increased soaping effect, thereby preserving both skin feel and UV protection.

Inventive Principle:
Principle #35Parameter changes

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 formulation achieves a more appealing skin feel and increased consumer compliance by minimizing the soaping effect, ensuring adequate sunscreen application and effective UV protection.

Implementation Method 1

BEMT acts as a broad-spectrum UV filter absorbing UVB as well as UVA rays. It has two absorption peaks, 310 and 340 nm.

Methodology Applied
Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentEP4340804B1Sunscreen composition comprising bemotrizinol
Publication Date: 2026.02.04 DSM IP ASSETS BV

AI summary

The present invention relates to sunscreen compositions containing bis-ethylhexyloxyphenol methoxyphenyl triazine (BEMT) and at least one film forming agent selected from the group consisting of citrate crosspolymers and polyamides in combination with an alkandiol with the proviso that the composition is free of octocrylene, ethylhexyl triazone, diethylamino hydroxybenzoyl hexyl benzoate and ethylhexyl methoxycinnamate. Said compositions exhibit a reduced soaping effect and thus a more appealing skin feel and look.