Stick Compositions with Solubilizing System for UV Filter

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Solution Overview

Problem

Existing stick compositions containing bis-ethylhexyloxyphenol methoxyphenyl triazine face challenges in achieving high UV protection while maintaining a stable and pleasant texture, particularly in transparent or translucent forms like gels, due to the tendency of the UV filter to recrystallize.

Innovation Solution

The composition includes bis-ethylhexyloxyphenol methoxyphenyl triazine, a solvent system for solubilizing it, and at least one lipophilic gelling agent, added in amounts effective for UV protection and potentially in a super-saturated amount, to inhibit recrystallization and maintain a transparent or translucent, stable texture.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If high levels of UV filters including bis-ethylhexyloxyphenol methoxyphenyl triazine are used to achieve high UV protection, then UV protection capability is improved, but the composition stability and texture quality deteriorate due to recrystallization of the UV filter

Engineering Contradiction:

ImproveUV protection capabilityVSAvoidcomposition stability

Core Design Contradiction:

Object-affected harmful factorsVSStability of the object's composition

Solution Approach 1:

The patent modifies the physical-chemical parameters of the UV filter by incorporating it into a solubilizing system that changes its state from crystalline to dissolved form. This parameter change prevents recrystallization while maintaining high UV protection levels, thereby resolving the contradiction between UV protection capability and composition stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a solubilizing system as an intermediary between the UV filter and the cosmetic base. This intermediary system prevents direct contact and interaction between the UV filter and other formulation components that would otherwise lead to recrystallization, thus maintaining both high UV protection and composition stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If high amounts of solid UV filter bis-ethylhexyloxyphenol methoxyphenyl triazine are incorporated to maximize protection, then UV filtering efficiency is improved, but the ease of formulation and texture quality worsen

Engineering Contradiction:

ImproveUV filtering efficiencyVSAvoidease of formulation

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The patent changes the physical state and solubility parameters of the solid UV filter by using a solubilizing system. This transformation allows high amounts of the UV filter to be incorporated into the formulation without causing formulation difficulties or texture defects, thereby improving both UV filtering efficiency and ease of manufacture.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies the solubilizing system locally to the UV filter components, creating a micro-environment where the UV filter remains in solution rather than precipitating. This localized treatment allows high concentrations of UV filter to be used while maintaining ease of formulation and desirable texture characteristics.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the amount of bis-ethylhexyloxyphenol methoxyphenyl triazine approaches or surpasses the solubility limit, then UV protection is maximized, but recrystallization occurs leading to instability

Engineering Contradiction:

ImproveUV protectionVSAvoidrecrystallization inhibition

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent fundamentally changes the solubility parameters of the UV filter through the solubilizing system, thereby increasing the effective solubility limit. This allows the UV filter to be present at high concentrations that maximize UV protection while remaining in solution and preventing recrystallization, thus maintaining reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies preliminary action by incorporating the solubilizing system before the UV filter reaches its normal solubility limit. This pre-treatment ensures that the UV filter remains in solution even at high concentrations, preventing recrystallization and maintaining product stability throughout its shelf life.

Inventive Principle:

Principle #10Preliminary action

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 approach results in stick compositions that provide effective UV protection, inhibit recrystallization of bis-ethylhexyloxyphenol methoxyphenyl triazine, and maintain good application and use properties, ensuring a stable and pleasant texture.

Implementation Method 1

a solvent system for solubilizing bis-ethylhexyloxyphenol methoxyphenyl triazine

Methodology Applied

Scientific EffectSolubilization: Solvation

Implementation Method 2

at least one lipophilic gelling agent

Methodology Applied

Scientific EffectGel formation: Gel

Data Source

PatentUS20250195368A1Stick compositions containing BIS-ethylhexyloxyphenol methoxyphenyl triazine, lipophilic gelling agent, and a solvent system

Publication Date: 2025.06.19 LOREAL SA

AI summary

The present disclosure relates to stick compositions including 2,4-bis-{[4-(2-ethyl hexyloxy)-2-hydroxy]-phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, at least one solvent for solubilizing the bemotrizinol, and at least one lipophilic gelling agent, as well as to methods of making and using such compositions.