Antiperspirant Composition Thermal Stability Roll-On Viscosity
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Solution Overview
Problem
Aqueous antiperspirant compositions lack thermal stability at high temperatures, making them ineffective for global application and difficult to formulate, especially around 50°C and above, and also exhibit unsuitable viscosity for roll-on product delivery.
Innovation Solution
A combination of glyceryl mono- or di- ester, fatty alcohol, and glycerol in specific weight ratios, along with water and ethoxylated fatty alcohol, enhances thermal stability and viscosity, allowing the composition to remain stable for 7 days at 50°C or 55°C without phase separation and providing suitable viscosity for roll-on dispensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If aqueous antiperspirant composition is formulated with conventional ingredients, then the product can be delivered via roll-on dispenser, but the product lacks thermal stability at high temperatures (50°C and above)
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific combination of glyceryl mono- or di-ester (1-5 wt%), fatty alcohol (0.5-5 wt%), and glycerol (1-8 wt%) in controlled amounts. This parameter modification enables the formulation to maintain thermal stability at 50°C and above while preserving its antiperspirant effectiveness and roll-on deliverability.
Solution Approach 2:
The patent creates a composite system by combining glyceryl mono- or di-ester, fatty alcohol, and glycerol in a specific ratio (weight ratio of glyceryl mono- or di-ester to glycerol from 1:3 to 3:1). This composite material approach provides synergistic effects that simultaneously improve thermal stability, maintain appropriate viscosity for roll-on dispensing, and preserve sweat control functionality.
2Stability of the object's composition
If the product viscosity is increased to improve stability, then thermal stability improves, but the product becomes too viscous for roll-on dispenser delivery
Solution Approach 1:
The patent carefully controls the viscosity parameter by adjusting the concentrations of glyceryl mono- or di-ester, fatty alcohol, and glycerol. The specific weight ratios (glyceryl mono- or di-ester to glycerol from 1:3 to 3:1) are optimized to achieve the right balance: enough viscosity for thermal stability but low enough for smooth roll-on dispensing.
Solution Approach 2:
The patent applies different functional roles to different ingredients in the mixture. The glyceryl mono- or di-ester and fatty alcohol provide structural stability and viscosity control, while the glycerol component ensures adequate flow properties for roll-on application. This local functional differentiation allows the formulation to satisfy both stability and dispensability requirements.
Data Source
AI summary
The invention relates to an aqueous antiperspirant composition comprising: a) from 5 to 30 wt.% of an antiperspirant active; b) from 1 to 5 wt.% of a glyceryl mono- or di- ester; c) from 0.5 to 5 wt.% of a fatty alcohol; d) from 1 to 8 wt.% of glycerol; and, e) from 30 to 90 wt.% of water; f) 0.15 to 2.5 wt.% of an ethoxylated fatty alcohol containing C14-C20 carbon atoms, wherein the degree of ethoxylation is between 10 to 25 moles of ethoxylate per mole of fatty alcohol; wherein the weight ratio of b) to d) is from 1 :3 to 3:1; and, wherein the formulation has a viscosity as measured by a Brookfield viscometer at 25°C of from 1,000 to 12,000 cps.