Aerosol Spray Jet Focusing via Ester Ratio Control
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Solution Overview
Problem
Propellant-driven aerosol compositions often suffer from unsatisfactory spray focusing, leading to undesirable product losses and excessive application rates due to high pressure and fine particle distribution, which can result in lower sweat reduction efficacy compared to other forms like sticks or roll-ons despite higher active ingredient concentration.
Innovation Solution
Incorporating a specific combination of two different esters in a certain quantitative ratio within the aerosol composition, along with a propellant, to improve the control and focusing of the spray jet, ensuring a consistent and effective application of active ingredients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If high pressure and fine particle distribution are used in propellant-driven aerosols, then spray coverage is improved, but spray focusing deteriorates leading to product losses and excessive application rates
Solution Approach 1:
The patent modifies the physical-chemical parameters of the aerosol composition by incorporating specific esters (fatty acid esters with 12-24 carbon atoms and branched-chain alcohol esters with 5-18 carbon atoms) in controlled amounts (1-30% and 1-10% by weight respectively). These parameter changes alter the spray characteristics to improve focusing while maintaining coverage, resolving the contradiction between spray coverage and product loss.
Solution Approach 2:
The patent creates a composite aerosol system by combining multiple ester components with specific physical properties (viscosity, surface tension, volatility) in defined ratios. This composite approach allows optimization of spray focusing and coverage simultaneously, preventing the formation of excessive spray mist while ensuring adequate area coverage.
2Quantity of substance
If high active ingredient concentration is used in aerosol sprays, then effectiveness should be improved, but spray focusing deterioration leads to lower sweat reduction compared to other forms
Solution Approach 1:
The patent adjusts the composition parameters by adding specific esters that modify the spray dynamics and deposition characteristics. This allows high active ingredient concentrations (5-60% aluminum salts, 0.1-10% zinc compounds) to be delivered more effectively to the target surface, improving sweat reduction efficacy despite the aerosol delivery method.
Solution Approach 2:
The esters act as intermediary substances that facilitate the transfer of active ingredients from the aerosol phase to the skin surface. By improving spray focusing and reducing mist formation, these esters ensure that the high concentration of active ingredients reaches the intended target rather than dispersing as loss, thereby maintaining reliability of sweat reduction.
3Ease of operation
If propellant-driven aerosol spray is used, then convenient handling and dosing are achieved, but spray focusing is unsatisfactory causing excessive application rate
Solution Approach 1:
The patent modifies the aerosol composition parameters by incorporating esters that adjust the spray dynamics. This allows the aerosol to maintain its convenience for handling and dosing while improving spray focusing to reduce the application rate, resolving the contradiction between ease of operation and excessive application rate.
Data Source
AI summary
The invention relates to aerosol compositions for body care, which contain - at least one propellant and - at least one composition A, which contains a) at least one ester which is formed from at least one linear or branched, saturated or unsaturated alcohol having 4 to 30 carbon atoms and at least one linear or branched, saturated or unsaturated carboxylic acid having 8 to 30 carbon atoms, and b) at least one ester which is formed from at least one C2-C7 mono-, di-, or tricarboxylic acid, which can optionally contain one or more hydroxyl groups, and at least one linear or branched, saturated or unsaturated alcohol having 1 to 30 carbon atoms. Composition A contains at most 2 wt% of free water relative to the total weight of composition A. The weight ratio of ester a) : ester b) in composition A is 4.5 : 1 to 1.5 : 1. The invention further relates to a deodorising aerosol composition for body care, which contains, in relation to the total weight of the deodorising aerosol composition, - 10 to 90 wt% of at least one propellant, selected from propane, n-butane, isobutane, n-pentane, isopentane, dimethyl ether, carbon dioxide, dinitrogen oxide, fluorocarbons, and/or chlorofluorocarbons, and - 1 to 40 wt% of at least one composition A, which contains a) at least one ester which is formed from at least one linear or branched, saturated or unsaturated alcohol having 4 to 30 carbon atoms and at least one linear or branched, saturated or unsaturated carboxylic acid having 8 to 30 carbon atoms, b) at least one ester which is formed from at least one C2-C7 mono-, di-, or tricarboxylic acid, which can optionally contain one or more hydroxyl groups, and at least one linear or branched, saturated or unsaturated alcohol having 1 to 30 carbon atoms, and c) at least one antiperspirant active ingredient. Composition A contains at most 2 wt% of free water, relative to the total weight of composition A. The weight ratio of ester a) : ester b) in composition A is 4.5 :1 to 1.5 : 1. The compositions according to the invention are characterised in that the spray jet of said compositions has better focusing.