Antiperspirant Emulsion Structurant Stabilization
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Solution Overview
Problem
The challenge in manufacturing antiperspirant products lies in maintaining the active level within 10% of the product's weight without volatile loss, particularly in multi-phase products like water-in-silicone oil emulsions, where evaporated water can condense and disrupt the emulsion or cause syneresis, leading to product instability.
Innovation Solution
The method involves creating antiperspirant emulsions with a continuous water-immiscible phase and a disperse aqueous phase, using suitable water-immiscible liquids like volatile and non-volatile silicones, and structurants to stabilize the emulsion, along with surfactants to facilitate the formation of a stable emulsion, while controlling temperature and residence time to minimize volatile loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If water-in-silicone oil emulsion is used as antiperspirant product, then product formulation flexibility is improved, but emulsion stability deteriorates due to water evaporation through continuous phase
Solution Approach 1:
A membrane-forming structurant is introduced as an intermediary component between the aqueous phase and silicone oil continuous phase. This structurant forms a protective membrane around aqueous droplets, preventing direct contact and interaction between phases, thereby eliminating water evaporation through the continuous phase while maintaining emulsion stability and formulation flexibility
2Ease of manufacture
If heating is applied to dissolve structurant, then structurant dissolution is improved, but volatile loss increases
Solution Approach 1:
The dissolution process is achieved by changing the physical state of the structurant from solid to liquid through heating, allowing complete dissolution in the continuous phase. This parameter change enables easy manufacture while minimizing volatile loss by controlling the heating process to dissolve only the structurant and not evaporate volatile components
3Ease of manufacture
If emulsion is heated to dissolve structurant, then structurant dissolution is improved, but emulsion stability deteriorates due to volatile loss
Solution Approach 1:
The heating process is applied continuously and uniformly throughout the emulsion to ensure complete structurant dissolution. This continuous action maintains emulsion stability by preventing localized overheating or incomplete dissolution, while the controlled heating process minimizes volatile loss through the entire emulsion mass
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 ensures the formation of stable antiperspirant emulsions with consistent droplet size, reducing the risk of emulsion breakdown and volatile loss, thereby maintaining the active level and product integrity.
Implementation Method 1
The continuous phase contains an emulsifying surfactant, the structurant and other ingredients that ultimately end up in the product continuous phase
Implementation Method 2
The continuous phase contains an emulsifying surfactant, the structurant and other ingredients that ultimately end up in the product continuous phase
Data Source
AI summary
A method for making an emulsified antiperspirant product is provided. The product has a continuous phase with a water-immiscible liquid and a disperse aqueous phase with an antiperspirant active. The method steps include providing a water-immiscible liquid; providing a volatile aqueous solution with an antiperspirant active; combining the water-immiscible liquid and the aqueous solution to form an emulsion with a continuous phase including the water-immiscible liquid and a disperse phase including the aqueous solution; providing a structurant separate from the emulsion and adding it to the emulsion to form an emulsified antiperspirant composition. The emulsified antiperspirant composition is heated to a temperature between 60° C. and 110° C. from 15 minutes to less than 2 hours. The emulsified antiperspirant composition is transferred into one or more dispensing containers. The batch weight of the emulsified antiperspirant composition may be greater than 20 kg.