Homogeneous Sunscreen Composition Using Liquid UV Filters and Esters

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Solution Overview

Problem

Existing sun protection products with high SPF face challenges in stability, solubility, and sensory issues due to the use of high concentrations of solid lipophilic organic UV filters, leading to decreased UV protection and uncomfortable skin sensations.

Innovation Solution

A homogeneous sun protective composition using a UV filter system comprising Diethylamino Hydroxybenzoyl Hexyl Benzoate, Ethylhexyl Triazone, and Bis-ethylhexyloxyphenol Methoxyphenyl Triazine, combined with specific ester compounds like Isopropyl lauroyl sarcosinate and diisopropyl sebacate, which ensures complete solubility and stability while minimizing the use of potentially harmful or ecologically detrimental ingredients.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If high concentrations of solid lipophilic organic UV filters are used to achieve high SPF, then UV protection is improved, but solubility and stability deteriorate due to (re)crystallisation

Engineering Contradiction:

ImproveUV protection effectivenessVSAvoidformula stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the physical state parameter of the UV filters from solid to liquid by selecting specific liquid organic UV filters (octocrylene, ethylhexyl methoxycinnamate, homosalate, ethylhexylsalicylate) to replace solid lipophilic organic UV filters. This parameter change prevents (re)crystallisation while maintaining high SPF through effective UV absorption, thereby resolving the contradiction between UV protection and formula stability.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If high concentrations of solid lipophilic organic UV filters are used to achieve high SPF, then UV protection is improved, but sensory properties deteriorate with heavy, oily and sticky sensations

Engineering Contradiction:

ImproveUV protection effectivenessVSAvoidsensory comfort

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the physical state parameter from solid to liquid, selecting liquid organic UV filters that provide high UV absorption efficiency without the heavy, oily, and sticky sensations associated with solid lipophilic filters. This parameter change simultaneously improves sensory comfort while maintaining effective UV protection.

Inventive Principle:

Principle #35Parameter changes

3Stability of the object's composition

If conventional UV filters (octocrylene, ethylhexyl methoxycinnamate, homosalate, ethylhexylsalicylate) are used to dissolve and stabilize solid lipophilic organic UV filters, then solubility and stability are improved, but health and environmental safety deteriorate

Engineering Contradiction:

Improveformula stabilityVSAvoidhealth and environmental impact

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes the controversial conventional UV filters (octocrylene, ethylhexyl methoxycinnamate, homosalate, ethylhexylsalicylate) from the formulation, replacing them with alternative UV filters that provide equivalent or superior stability and solubility without the associated health and environmental concerns. This extraction eliminates harmful factors while preserving formula stability.

Inventive Principle:

Principle #2Taking out (Extraction)

4Ease of operation

If siloxanes and derivatives are added to reduce sticky and greasy feeling, then sensory properties are improved, but ecological footprint and skin occlusion worsen

Engineering Contradiction:

Improvesensory comfortVSAvoidecological footprint and skin occlusion

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and removes siloxanes and derivatives from the formulation, replacing them with alternative ingredients that provide equivalent sensory benefits without the ecological footprint and skin occlusion issues. This extraction eliminates harmful factors while maintaining sensory comfort.

Inventive Principle:

Principle #2Taking out (Extraction)

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 composition provides a high SPF of at least 30, maintains stability over time, and offers a light, non-greasy, and easily spreadable formula with enhanced naturalness, avoiding the drawbacks of traditional products.

Implementation Method 1

Organic filters, also called chemical filters, absorb UV radiations instead of the skin

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

In contrast, inorganic UV filters which are also called physical filters, reflect the UV radiations

Methodology Applied

Scientific EffectReflection: Reflection

Data Source

PatentEP4015046A1Sun protection topical compositions

Publication Date: 2022.06.22 SOC DE RECH COSMETIQUE

AI summary

The invention concerns a homogeneous sun protective topical composition comprising: an effective amount of a UV filter system comprising a mixture of following compounds: Diethylamino Hydroxybenzoyl Hexyl Benzoate (DHHB), Ethylhexyl Triazone (EHT), and Bis-ethylhexyloxyphenol Methoxyphenyl Triazine (BEMT); and a mixture of ester compounds comprising isopropyl lauroyl sarcosinate, and diisopropyl sebacate, said ester compounds mixture being in quantity just required for producing said homogeneous sun protective topical composition, achieving a SPF value of at least 10. The invention also relates to a ready to use sunscreen preparation comprising the homogeneous sun protective topical composition.