Personal Care Aerosol Composition for Targeted Powder Delivery
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Solution Overview
Problem
Existing antiperspirant aerosol sprays face challenges in delivering finely divided active compounds effectively to the skin, with issues such as wide dispersion, particle bounce-off, and the need to replace volatile silicone fluids like D-4 and D-5, which pose environmental concerns.
Innovation Solution
A personal care formulation using trans-1-chloro-3,3,3-trifluoropropene (trans-1233zd) as a hydrophobic carrier with a co-carrier, in specific weight ratios, to create a dry silky feel and improve targeting without using volatile silicone fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If volatile silicone fluids (D-4, D-5) are used as carrier fluids, then the active ingredients can be effectively dispersed and suspended, but the fluids escape into the biosphere causing environmental harm
Solution Approach 1:
The patent replaces volatile silicone fluids with hydrophobic carrier fluids having different physical-chemical parameters (lower volatility, different viscosity range of 10-1000 cSt). This parameter change maintains carrier functionality while eliminating environmental harm from volatile silicone escape
Solution Approach 2:
The patent uses alternative hydrophobic carrier fluids (such as hydrocarbon oils, ester oils, or silicone oils with different volatility profiles) that are less environmentally harmful than D-4/D-5, effectively replacing the problematic substance while maintaining the required carrier functions
2Ease of operation
If dry powder spray is used, then the antiperspirant can be smoothly applied to the skin, but the particles form a wide dispersion cloud causing many particles to miss the target area
Solution Approach 1:
The patent uses hydrophobic carrier fluids as intermediaries to suspend the active powder particles. These carriers form a liquid medium that controls particle dispersion and delivery, allowing particles to be carried precisely to the target area rather than forming a wide cloud
Solution Approach 2:
The patent employs aerosol technology where the hydrophobic carrier fluid containing suspended particles is delivered as a controlled spray. The hydraulic/pneumatic delivery system ensures precise targeting while maintaining smooth application characteristics
3Productivity
If high energy is imparted to particles by the propellant, then the spray can be effectively dispersed, but many particles bounce off the skin of the user
Solution Approach 1:
The patent changes the physical parameters of the carrier fluid (viscosity, surface tension, hydrophobicity) to optimize particle-skin interaction. The selected hydrophobic carriers reduce particle bounce-off by modifying how particles contact and adhere to the skin surface
Solution Approach 2:
The patent creates a composite system where active powder particles are suspended in hydrophobic carrier fluids. This composite formulation allows the carrier to cushion particle impact and improve retention while maintaining effective dispersion through the spray mechanism
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 formulation achieves effective delivery of active ingredients with a dry silky feel, reducing particle bounce-off and environmental impact, while maintaining a well-targeted spray pattern.
Implementation Method 1
The aerosol spray is produced by rapid transition of the propellant from the liquid to the vapor phase as it dispenses from the atomizing valve of the aerosol container
Implementation Method 2
fine droplets of the anhydrous carrier are able to travel to the target area in a more well-formed spray pattern
Implementation Method 3
the active powder, and then fine droplets of the anhydrous carrier are able to travel to the target area
Data Source
AI summary
Disclosed are personal care formulations for delivery to the skin of a person in the form of an aerosol comprising: (1) non-propellant components comprising at least one active ingredient in the form of finely divided particles, at least one hydrophobized clay, a hydrophobic carrier comprising trans-1-chloro-3,3,3-trifluoropropene (trans-1233zd) and at least one co-carrier wherein: (i) the weight ratio of said trans-1233zd:co-carrier is from about 0.25:1 to about 4:1; (ii) said trans-1233zd and said co-carrier together comprise at least about 40% by weight of said hydrophobic carrier.