Inorganic Capsule Shells for Antiperspirant Perfume Leakage Control
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Solution Overview
Problem
Existing antiperspirant and deodorant products with perfumed core/shell capsules face issues with inconsistent perfume leakage due to differences in leakage rates of various perfume raw materials, leading to undesirable olfactory experiences and quality control problems.
Innovation Solution
The development of antiperspirant or deodorant compositions featuring capsules with a core surrounded by a substantially inorganic shell comprising a condensed layer and a nanoparticle layer, where the condensed layer is formed from a precursor compound and the nanoparticle layer is made of inorganic nanoparticles, providing improved mechanical properties and low permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polymeric capsule shells are used for perfume delivery, then the capsules can deliver benefit agents to target surfaces, but the capsules may leak before the ideal release time due to inconsistent leakage rates of different perfume raw materials
Solution Approach 1:
The patent changes the material parameter of the capsule shell from organic polymeric materials to inorganic materials (silica, aluminum oxide, titanium oxide). This fundamental material parameter change results in shells with uniform molecular structure and controlled porosity, ensuring consistent leakage rates for all perfume raw materials regardless of their chemical properties, thereby resolving the reliability and composition stability contradiction
Solution Approach 2:
The patent employs composite shell structures combining multiple inorganic materials (e.g., silica with aluminum oxide or titanium oxide). This composite approach allows optimization of mechanical strength and leakage control properties, creating shells that maintain structural integrity while providing uniform permeability characteristics for consistent perfume delivery
2Adaptability or versatility
If multiple perfume raw materials are used in the capsule core, then the perfume can provide complex olfactory profiles, but different PRMs leak at different rates causing quality control issues and consumer dissatisfaction
Solution Approach 1:
The patent changes the shell material parameter to inorganic materials with uniform pore structures. This ensures that the leakage rate is determined by physical parameters (pore size, shell thickness) rather than chemical interactions between the shell and different perfume raw materials, achieving manufacturing precision while maintaining perfume profile complexity
Solution Approach 2:
The patent applies local quality control by precisely controlling the porosity and thickness of specific shell regions. This allows the shell to provide uniform leakage resistance across all perfume raw materials while maintaining the complex olfactory profile through controlled release of multiple PRMs
3Ease of manufacture
If organic polymeric shell materials are used, then the capsules can be manufactured with various properties, but the shells lack the mechanical strength and low permeability required for consistent perfume delivery
Solution Approach 1:
The patent changes the fundamental material parameter from organic polymers to inorganic materials. Inorganic shells provide superior mechanical strength and controlled low permeability while maintaining ease of manufacture through established sol-gel and deposition processes, resolving the contradiction between manufacturing flexibility and mechanical strength
4Productivity
If the capsule shell has high permeability to allow perfume release, then the perfume can be delivered to the skin, but the perfume may leak prematurely during transport and storage
Solution Approach 1:
The patent changes the shell material to inorganic materials with precisely controllable porosity parameters. This allows the shell to maintain low permeability during storage (preventing leakage) while enabling controlled perfume delivery when applied to skin, resolving the contradiction between productivity and reliability through parameter optimization
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 solution results in consistent and low perfume leakage rates, maintaining the intended perfume character and providing a stable barrier against solvents and antiperspirant actives, ensuring consistent olfactory performance and consumer satisfaction.
Implementation Method 1
the condensed layer comprises a condensation product of a precursor
Implementation Method 2
providing improved mechanical properties and low permeability
Data Source
AI summary
Antiperspirant and deodorant compositions that include capsules characterized by substantially inorganic shells. The present disclosure further relates to methods of making and using such compositions.