Transparent Emulsifier System for Low-Temperature Stability
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Solution Overview
Problem
Existing cosmetic agents in the form of microemulsions often suffer from instability at low temperatures, leading to cloudiness during storage and transport, and can cause skin intolerance and textile stains due to high emulsifier content, while also requiring improvement in antiperspirant and deodorizing efficacy.
Innovation Solution
A cosmetic agent in the form of an O/W emulsion containing a specific combination of nonionic emulsifiers, such as ethoxylated saturated and linear mono-unsaturated alcohols, C8-C14 alkyl glucosides, antiperspirant/deodorizing active ingredients, and an oil component, with a low emulsifier concentration to enhance skin tolerance and stability at low temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high emulsifier content is used to stabilize the emulsion, then emulsion stability is improved, but skin tolerance deteriorates and textile stains increase
Solution Approach 1:
The patent changes the HLB value parameter of the emulsifier system by selecting specific nonionic emulsifiers with HLB values between 8 and 18, optimizing the balance between emulsion stability and skin compatibility. This parameter optimization allows achieving adequate stability with reduced emulsifier content, thereby improving skin tolerance.
Solution Approach 2:
The patent uses a composite emulsifier system combining multiple nonionic emulsifiers with different HLB values (one with HLB 8-14 and another with HLB 10-18) to achieve synergistic effects. This composite approach provides enhanced emulsion stability at lower total emulsifier concentrations, reducing skin irritation and textile staining while maintaining stability.
2Illumination intensity
If microemulsion droplet size is reduced below 200 nm to achieve transparency, then optical transparency is improved, but emulsifier content must increase leading to skin intolerance
Solution Approach 1:
The patent optimizes the droplet size parameter to a specific range (below 200 nm) that ensures optical transparency while minimizing the emulsifier concentration needed for stabilization. By precisely controlling this size parameter and combining it with optimized HLB values, the formulation achieves transparency without requiring excessive emulsifiers that would cause skin intolerance.
Solution Approach 2:
The patent applies different emulsifier characteristics to different aspects of the emulsion: one emulsifier (HLB 8-14) primarily stabilizes the droplet interface for transparency, while the second emulsifier (HLB 10-18) provides additional steric stabilization to reduce total emulsifier needs, thereby maintaining transparency with lower overall emulsifier content and reduced skin irritation.
3Temperature
If microemulsion is exposed to low temperatures during storage, then transport conditions are met, but emulsion becomes cloudy and stability deteriorates
Solution Approach 1:
The patent modifies the emulsifier composition parameters by selecting nonionic emulsifiers with specific HLB ranges that provide thermotropic stability. These emulsifiers maintain their emulsifying effectiveness across a wide temperature range, preventing phase separation and cloudiness at low storage temperatures while maintaining transparency at room temperature.
Solution Approach 2:
The patent introduces a second nonionic emulsifier with HLB value of 10-18 as an intermediary that provides temperature-dependent stabilization. This emulsifier becomes particularly effective at lower temperatures, acting as a mediator that prevents droplet aggregation and phase separation during cold storage and transport, thereby maintaining emulsion stability across temperature variations.
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 agent achieves high transparency, improved storage stability at low temperatures, excellent skin tolerance, and effective antiperspirant and deodorizing performance with reduced residue formation on textiles.
Implementation Method 1
a combination of selected nonionic emulsifiers in specific percentages by weight
Implementation Method 2
Cosmetic agents in the form of transparent microemulsions
Data Source
AI summary
The present disclosure relates to antiperspirant and/or deodorizing cosmetic agents in the form of emulsions, which contain a combination of nonionic O/W emulsifiers, in particular isoceteth-20, oleth-20, and at least one C8-C14 alkyl glucoside, preferably lauryl glucoside. The cosmetic agents as contemplated herein are optically transparent and have an improved storage stability at low temperatures.