Two-Compartment Aerosol Device Pressure Retention
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Solution Overview
Problem
Aerosol devices for styling compositions suffer from gas pressure loss over time due to leaks, leading to poor distribution of the liquid phase on hair, especially when the quality of the spray degrades with increased polymer concentration, and existing two-compartment devices with compressed gases do not adequately address these issues.
Innovation Solution
A two-compartment aerosol device with a mechanical separation of the liquid and compressed gas phases, using an anionic carboxylic polymer without urethane units in an alcoholic or hydroalcoholic medium, and compressed gases like air or nitrogen, maintaining pressure between 1 and 12 bars, ensures effective propulsion and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compressed gas is used to propel the liquid phase, then propulsion and distribution of the styling composition is achieved, but gas pressure is lost over time due to leaks
Solution Approach 1:
The patent extracts the propellant function from the traditional single-phase aerosol system by introducing a separate compressed gas phase. The compressed gas is mechanically separated from the liquid styling composition, allowing independent optimization of propulsion (gas) and styling (liquid) functions. This extraction resolves the contradiction by enabling reliable pressure retention in the gas phase while maintaining effective propulsion capability.
2Reliability
If polymer concentration is increased to achieve greater fixation, then fixation level improves, but spray quality degrades
Solution Approach 1:
The patent segments the aerosol system into distinct functional phases: a compressed gas phase for propulsion and a liquid phase containing high-concentration polymer for fixation. This segmentation allows the liquid phase to be optimized for maximum polymer content (improving fixation) without compromising spray quality, as the compressed gas phase ensures proper atomization and distribution independent of polymer concentration.
3Reliability
If two-compartment device with compressed gas is used, then gas pressure loss and distribution issues are addressed, but device complexity increases
Solution Approach 1:
The patent employs pneumatic principles by using compressed gas as a separate propellant phase. The compressed gas exerts pressure on the liquid styling composition through a shared chamber interface, propelling it through the nozzle system. This pneumatic approach achieves reliable pressure retention and consistent distribution while utilizing well-established aerosol technology, thereby limiting the increase in device complexity.
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 configuration provides improved fixation and shaping capabilities by preventing gas leakage and ensuring consistent distribution of the styling composition, achieving levels of fixation not typically possible with conventional products.
Implementation Method 1
a propellant which is a gas liquefied under reduced pressure or dissolved in the liquid phase
Data Source
AI summary
The present invention relates to an aerosol device having two compartments, including a hairstyling composition in a first compartment and a compressed gas, selected from air, nitrogen, carbon dioxide and the mixtures thereof, in a second compartment. Said hairstyling composition includes at least one compound (A) selected from a carboxylic anionic polymer having no urethane units, a linear sulfonic polyester, and a cellulose compound in an alcoholic or hydroalcoholic medium that includes at least 5 wt %, relative to the weight of said composition, of a C1-C4 monohydric alcohol. Said aerosol device can constitute hairspray. The invention also relates to a hairstyling method implementing the device of the invention.