Aluminum-Free Deodorant Stick Composition for pH and Hardness Balance
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Solution Overview
Problem
There is a challenge in formulating aluminum-free deodorant sticks that are low in irritation, maintain pH control to inhibit bacterial growth, and have physical and thermal stability, while ensuring optimal application and consumer acceptability.
Innovation Solution
A deodorant stick composition comprising 80-95% solvent, with a ratio of polar to non-polar organic solvents between 1:3 to 3:1, and a structurant content of 2-5%, achieving a hardness of 80-120 mm*10, and a pH of 9-10.5, to ensure effective bacterial inhibition and consumer comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aluminum-free deodorant stick with polar organic solvents is formulated, then skin irritation is reduced, but pH control to inhibit bacterial growth becomes challenging
Solution Approach 1:
The patent adjusts the concentration of polar organic solvents (1,3-propanediol and/or glycerin) to specific ranges (20-50% by weight) and modifies the overall formulation parameters including structurant content (2-5%) and solvent composition ratios to achieve both low irritation and effective pH control (pH 9-10.5) simultaneously
Solution Approach 2:
The deodorant stick uses a composite formulation combining polar organic solvents (1,3-propanediol and/or glycerin), non-polar organic solvents (dipropylene glycol and/or propylene glycol), and structurants in specific ratios to create a system that provides both skin-friendly properties and effective bacterial inhibition through maintained pH levels
2Object-affected harmful factors
If deodorant stick with high polar organic solvent content is used, then skin irritation is reduced, but physical and thermal stability deteriorates
Solution Approach 1:
The patent optimizes the polar organic solvent content within a specific range (20-50% by weight of composition) rather than maximizing it, and adjusts the ratio of polar to non-polar solvents and structurant content (2-5%) to achieve the right balance between skin compatibility and physical/thermal stability, preventing the stick from melting during shipping and handling
Solution Approach 2:
The formulation combines polar organic solvents (1,3-propanediol and/or glycerin), non-polar organic solvents (dipropylene glycol and/or propylene glycol), and structurants in specific proportions to create a composite material system where the non-polar solvents and structurants provide structural integrity and thermal stability while the polar solvents provide skin-friendly properties
3Ease of operation
If deodorant stick with low structurant content is formulated, then application smoothness is improved, but hardness control becomes difficult
Solution Approach 1:
The patent specifies a narrow range for structurant content (greater than 2% and less than 5%) to achieve optimal balance between application smoothness and hardness (80-120 mm*10), allowing the deodorant to apply smoothly while maintaining proper hardness for stick form factor
Data Source
AI summary
A deodorant stick composition that contains from about 80% to about 90% of a solvent and a structurant. The solvent includes water and organic solvent that includes a polar organic solvent and a non-polar organic solvent. The polar organic solvent can include 1,3 propanediol and/or glycerin. The ratio of polar organic solvent to non-polar organic solvent is from about 4:5 to about 3:1. The deodorant stick composition can have a hardness from about 80 to about 120 mm*10.