PEG-Free Antiperspirant Emulsion for Non-Sticky Roll-On
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Solution Overview
Problem
Conventional antiperspirant roll-on emulsions often suffer from stickiness and instability due to high concentrations of polymeric thickeners, which can irritate the skin and are difficult to formulate, especially when exposed to temperature fluctuations, and typically rely on polyethylene-glycol-containing emulsifiers that are not ideal for cosmetic applications.
Innovation Solution
A perspiration-inhibiting composition in the form of an oil-in-water emulsion using a polyethylene oxide-free system, incorporating partial esters of polyglycerol with specific HLB values, N-acyl-L-glutamic acid sodium salts, and hydrogel-forming polymers, which provides stability and a non-sticky skin feel, suitable for use with a roll-on applicator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If polymeric thickening agents are used to thicken the composition for roll-on application, then the viscosity is sufficient for convenient application, but the skin feel becomes very sticky
Solution Approach 1:
The patent changes the chemical composition parameters by replacing polymeric thickeners with a specific emulsifier system (polyglycerol esters combined with N-acyl-L-glutamic acid sodium salts) that provides adequate viscosity through emulsion formation rather than polymer thickening, thereby achieving roll-on applicability without sticky skin feel
Solution Approach 2:
The patent uses a composite emulsifier system combining polyglycerol esters (HLB 3-7) with N-acyl-L-glutamic acid sodium salts (HLB 8-12) to create synergistic emulsion stability and viscosity, replacing single-component polymeric thickeners with a multi-component emulsifier blend that provides both thickening and skin-friendly properties
2Stability of the object's composition
If conventional polyethylene-glycol-containing emulsifiers are used, then the emulsion is stable, but the product has limitations for cosmetic applications due to skin irritation and formulation difficulties
Solution Approach 1:
The patent extracts and removes polyethylene-glycol components from the emulsifier system, replacing them with polyglycerol esters and N-acyl-L-glutamic acid sodium salts that provide equivalent emulsion stability without the skin irritation and formulation issues associated with PEG-containing emulsifiers
Solution Approach 2:
The patent changes the chemical parameters of the emulsifier system by selecting polyglycerol esters with specific HLB values (3-7) combined with N-acyl-L-glutamic acid sodium salts (HLB 8-12), creating a new emulsifier profile that maintains emulsion stability while improving skin compatibility and reducing irritation
3Stability of the object's composition
If high concentrations of emulsifier agents are used to stabilize the emulsion, then the emulsion remains stable, but skin irritation increases
Solution Approach 1:
The patent employs a composite emulsifier system where polyglycerol esters (HLB 3-7) and N-acyl-L-glutamic acid sodium salts (HLB 8-12) work synergistically, allowing effective emulsion stabilization at lower total emulsifier concentrations compared to conventional single emulsifiers, thereby reducing skin irritation
Solution Approach 2:
The patent optimizes the HLB parameter distribution by combining emulsifiers with complementary HLB ranges (3-7 and 8-12), creating a balanced emulsifier system that achieves stable emulsion formation with reduced emulsifier load, minimizing skin irritation while maintaining stability
4Stability of the object's composition
If the emulsion is exposed to high temperatures or large temperature fluctuations, then the emulsion may destabilize due to coalescence, but maintaining stability under these conditions is challenging
Solution Approach 1:
The patent uses a composite emulsifier system combining polyglycerol esters with N-acyl-L-glutamic acid sodium salts that provides enhanced temperature stability through synergistic interactions, resisting coalescence and destabilization under high temperature and temperature fluctuation conditions better than conventional emulsifier systems
Solution Approach 2:
The patent selects emulsifiers with specific HLB ranges (polyglycerol esters HLB 3-7 and N-acyl-L-glutamic acid sodium salts HLB 8-12) that provide optimal temperature stability, creating an emulsion system that maintains structural integrity and resists coalescence across a wide temperature range
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 composition achieves improved haptics with reduced stickiness and enhanced stability, maintaining effectiveness across varying temperatures and pH levels, while avoiding skin irritation and the limitations of EO/PO adducts.
Implementation Method 1
A perspiration-inhibiting composition in the form of an oil-in-water emulsion using a polyethylene oxide-free system, incorporating partial esters of polyglycerol with specific HLB values, N-acyl-L-glutamic acid sodium salts
Implementation Method 2
hydrogel-forming polymers, which provides stability and a non-sticky skin feel, suitable for use with a roll-on applicator
Data Source
AI summary
An antiperspirant composition in the form of an oil-in-water emulsion includes a PEG-free emulsifier system including selected polyglycerol citrate esters and an N-acylglutamate.