Oil-in-Water Emulsion Viscosity Profile for Skin Care
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Solution Overview
Problem
Cosmetic preparations, particularly oil-in-water (O/W) emulsions, face challenges in achieving a creamy-soft texture that is easy to spread, rapidly absorbable, and richly caring for large-area body applications, while maintaining stability and compatibility, which is difficult to quantify and subject to subjective sensory analysis.
Innovation Solution
The development of O/W emulsions with a specific flow curve depicting dynamic viscosity between 5 to 50 Pa, featuring a maximum of up to 10,000 Pa·s and a shoulder at 30 to 110 Pa, achieved through targeted adjustment of pseudoplastic flow behavior and thixotropy, using mineral oils and silicone oils, ensuring easy distribution and a velvety soft feel on the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If O/W emulsions are formulated for large-area body application, then they should be easy to spread and rapidly absorb, but they tend to have low viscosity and lack rich caring properties
Solution Approach 1:
The patent applies parameter changes by precisely controlling the viscosity profile of the O/W emulsion across different shear stress ranges. The formulation achieves a maximum viscosity of up to 10,000 Pa·s at low shear stress (5-50 Pa) for rich texture, while maintaining lower viscosity at high shear stress for easy spreadability. This differential viscosity behavior resolves the contradiction between richness and ease of application.
Solution Approach 2:
The patent uses composite materials by combining mineral oils and silicone oils in specific proportions within the emulsion formulation. This composite approach creates a preparation that exhibits both the spreadability of low-viscosity components and the rich caring properties of higher-viscosity components, simultaneously satisfying both requirements.
2Speed
If O/W emulsions are formulated for large-area body application, then they should be rapidly absorbable, but this conflicts with maintaining a creamy-soft texture
Solution Approach 1:
The patent applies dynamics by creating a time-dependent viscosity profile. The emulsion maintains high viscosity (up to 10,000 Pa·s) at rest to provide creamy-soft texture, but exhibits shear thinning behavior during application that reduces viscosity for easy spreading and rapid absorption. The dynamic rheological properties allow the preparation to transition between textured and absorbent states.
Solution Approach 2:
The patent changes the physical parameters of the emulsion by controlling its flow curve characteristics, specifically creating a maximum in the viscosity-shear stress relationship. This parameter optimization allows the preparation to maintain structural integrity for texture while enabling rapid absorption through controlled flow behavior.
3Stability of the object's composition
If O/W emulsions are formulated with high viscosity for rich texture, then they provide creamy-soft feel, but they become difficult to spread and absorb
Solution Approach 1:
The patent resolves this contradiction by changing the viscosity parameter across different shear stress conditions. The formulation achieves a maximum viscosity of up to 10,000 Pa·s in the low shear stress range (5-50 Pa) for rich texture, while the viscosity decreases at higher shear stress levels, enabling easy spreadability. This non-linear viscosity profile satisfies both requirements simultaneously.
Solution Approach 2:
The patent uses composite materials comprising mineral oils and silicone oils in optimized proportions to achieve the desired rheological profile. The combination creates a preparation that exhibits both high viscosity for texture and shear-thinning behavior for spreadability, resolving the contradiction between creamy-soft feel and ease of application.
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
These emulsions provide a consistent, creamy-soft texture that remains pleasant and supple on the skin for an extended period, enhancing the prior art in flowable preparations by offering a rich, caring experience while being easy to apply and absorb.
Implementation Method 1
targeted adjustment of pseudoplastic flow behavior and of the thixotropy
Implementation Method 2
targeted adjustment of pseudoplastic flow behavior and of the thixotropy
Data Source
AI summary
A cosmetic preparation of the oil-in-water type whose oil phase comprises one or more mineral oils and which has a flow curve depicting the dynamic viscosity as a function of the shear stress showing a maximum of up to 10 000 Pas at a shear stress of from 5 to 50 Pa and a shoulder at a shear stress of from 30 to 110 Pa.