Emulsion Cosmetic Thermo-Thickening Polymer Network

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Solution Overview

Problem

Existing photoprotective cosmetic compositions fail to maintain sufficient ultraviolet shielding ability at high temperatures and exhibit inadequate long-term storage stability.

Innovation Solution

An oil-in-water-type emulsion cosmetic comprising water, an organic UV filter, a thermo-thickening polymer, and an anionic surfactant, specifically a cellulosic thermo-thickening polymer or a triblock polyoxyalkylene-based thermo-thickening polymer, which maintains ultraviolet shielding ability and enhances storage stability by forming a network structure that increases viscosity and gelation at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If heat-induced gelling polymer is used to reduce migration at high temperature, then composition stability is improved, but long-term storage stability deteriorates

Engineering Contradiction:

Improvecomposition stabilityVSAvoidlong-term storage stability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent changes the temperature-response parameters of the thickening system by using a synergistic combination of two different thermo-thickening polymers instead of a single polymer. This allows the composition to maintain stability across a broader temperature range including long-term storage conditions, resolving the contradiction between high-temperature stability and storage stability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs a composite thickening system combining two distinct thermo-thickening polymers with different molecular structures and gelation mechanisms. This composite approach creates a more robust stability profile that addresses both high-temperature migration prevention and long-term storage stability simultaneously.

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If single thermo-thickening polymer is used to increase viscosity at high temperature, then migration resistance is improved, but ultraviolet shielding ability deteriorates

Engineering Contradiction:

Improvemigration resistanceVSAvoidultraviolet shielding ability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent applies local quality by having different polymer components perform specialized functions: one polymer primarily provides high-temperature thickening and migration resistance, while the other polymer maintains ultraviolet shielding ability and contributes to overall stability. This functional differentiation resolves the contradiction between migration resistance and UV protection.

Inventive Principle:

Principle #3Local quality

3Ease of operation

If composition fluidity increases at high temperature, then ease of operation is improved, but loss of composition increases

Engineering Contradiction:

Improveapplication easeVSAvoidcomposition loss

Core Design Contradiction:

Ease of operationVSLoss of substance

Solution Approach 1:

The patent implements dynamic viscosity control where the composition maintains lower viscosity at application temperature for easy spreading, then automatically increases viscosity at elevated temperatures to prevent runoff. This dynamic response resolves the contradiction between application ease and composition retention.

Inventive Principle:

Principle #15Dynamics

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 cosmetic composition effectively maintains ultraviolet shielding ability even at high temperatures and demonstrates excellent long-term storage stability, ensuring consistent protection and stability over time.

Implementation Method 1

the thermo-thickening polymer is (3a) a cellulosic thermo-thickening polymer containing a cyclodextrin and an alkyl cellulose

Methodology Applied

Scientific EffectThermo-thickening:

Implementation Method 2

when the temperature of the composition has increased on the skin it produces gelling, providing an effect of reducing or eliminating the effect of migration

Methodology Applied

Scientific EffectGelation: Gel

Implementation Method 3

the anionic surfactant is at least one selected from the group consisting of (4a) an anionic surfactant having the following chemical formula (ii) and (4b) an anionic surfactant having the following chemical formula (iii)

Methodology Applied

Scientific EffectSurfactant action: Surfactant

Implementation Method 4

an organic UV filter, (3) a thermo-thickening polymer... maintain ultraviolet shielding ability even when at high temperature after application

Methodology Applied

Scientific EffectUV absorption: Absorption (EM radiation)

Data Source

PatentUS20230040911A1Oil-In-Water-Type Emulsion Cosmetic

Publication Date: 2023.02.09 LVMH RECH

AI summary

An oil-in-water-type emulsion cosmetic comprising (1) water, (2) an organic UV filter, (3) a thermo-thickening polymer and (4) an anionic surfactant, wherein component (3) is (3a) a cellulosic thermo-thickening polymer or (3b) a triblock polyoxyalky-lene-based thermo-thickening polymer, and component (4) is selected from an alkyl phosphoric acid ester of 12 to 22 carbon atoms, an amide of alkylcarboxylic acid having 12 to 22 carbon atoms and an amino acid, and a monoester of a polycarboxylic acid and a glyceride of an alkylcarboxylic acid having 12 to 22 carbon atoms.