O/W Emulsion UV Filter System for High SPF Stability

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Solution Overview

Problem

Existing sun protection compositions, particularly oil-in-water (O/W) emulsions, struggle to achieve high sun protection factors (≥ 50) without using PEG emulsifiers, which can cause adverse skin reactions and are not stable.

Innovation Solution

A combination of pigmentary UV filters such as titanium dioxide, zinc oxide, and methylene bis-benzotriazolyl tetramethylbutylphenol, along with additional UV-A filters like diethylamino hydroxybenzoyl hexyl benzoate or butyl methoxydibenzoylmethane, is used to create stable O/W emulsions with enhanced UV protection, eliminating the need for PEG emulsifiers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PEG emulsifiers are used to create stable O/W emulsions with high sun protection factor, then the emulsion stability and SPF ≥ 50 are achieved, but adverse skin reactions occur

Engineering Contradiction:

Improveemulsion stabilityVSAvoidadverse skin reactions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The invention removes PEG emulsifiers from the formulation entirely, extracting the harmful component while maintaining emulsion stability through alternative means (natural emulsifiers or physical stabilization mechanisms), thereby eliminating adverse skin reactions associated with PEG compounds

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention changes the chemical composition parameters by substituting PEG emulsifiers with alternative emulsifying systems, altering the formulation's chemical profile to achieve both stability and skin compatibility without relying on problematic PEG compounds

Inventive Principle:

Principle #35Parameter changes

2Reliability

If pigmentary UV filters titanium dioxide, zinc oxide and methylene bis-benzotriazolyl tetramethylbutylphenol are combined, then sun protection factor of ≥ 50 is achieved, but formulation complexity increases

Engineering Contradiction:

Improvesun protection factorVSAvoidformulation complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention combines multiple pigmentary UV filters (titanium dioxide, zinc oxide, and methylene bis-benzotriazolyl tetramethylbutylphenol) into a single integrated filter system, merging their protective functions to achieve SPF ≥ 50 while managing formulation complexity through synergistic interactions

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The invention creates a composite UV filter system combining inorganic (titanium dioxide, zinc oxide) and organic (methylene bis-benzotriazolyl tetramethylbutylphenol) filters, leveraging the complementary properties of different material classes to achieve high sun protection factor

Inventive Principle:

Principle #40Composite materials

3Reliability

If additional UV-A filters are incorporated, then UV protection is enhanced, but the number of ingredients increases

Engineering Contradiction:

ImproveUV protectionVSAvoidnumber of ingredients

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The invention selects UV filters that provide multi-spectrum protection, where the pigmentary filters contribute to both UV-A and UV-B protection, and additional UV-A filters are chosen to complement rather than duplicate existing protective functions, maximizing UV protection coverage with minimal ingredient addition

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 significantly improved UV protection with a sun protection factor of ≥ 50, ensuring stability and reducing the risk of skin reactions by avoiding PEG emulsifiers, while maintaining effective skin absorption and application.

Implementation Method 1

Physical sun protection filters, such as oxides of metals, act like small mirrors on the skin that reflect and scatter UV radiation

Methodology Applied

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

Implementation Method 2

Physical sun protection filters, such as oxides of metals, act like small mirrors on the skin that reflect and scatter UV radiation

Methodology Applied

Scientific EffectScattering: Scattering

Implementation Method 3

Chemical sun protection filters convert the UV radiation that hits the skin into heat energy

Methodology Applied

Scientific EffectPhotoconversion:

Data Source

PatentEP2092930B1Sun block preparation in the form of an o/w emulsion with a sun block factor of _> 50

Publication Date: 2017.01.04 STADA ARZNEIMITTEL AG

AI summary

Light protective preparation in the form of oil-in-water emulsion comprises pigmented light protective filter containing titanium dioxide, zinc oxide and methylene bis-benzotriazolyl tetramethylbutylphenol, where the preparation exhibits a light protection factor of >= 50.