|  | Formulating Assistance: CO2 Propellants
Preparation of Nonaqueous LVP Aerosols with CO2 Propellants
Ralph M. Kowalik, ExxonMobil Chemical Company and Samir K. Hattar, Precision Valve Corporation
(Paper presented at Southern Aerosol Technical Association Meeting 3/25/99)
Introduction
With ever increasing levels of VOC (volatile organic compound) regulations for consumer products, formulators are constantly looking for ways to reduce the VOC content of their aerosol products. This has led many formulators to develop water-based aerosol products; however, there are a number of applications where water can be detrimental to or possibly incompatible with satisfactory product performance. Examples of these applications include certain insecticides, lubricants, and penetrating oils. For these and other nonaqueous aerosol applications, formulators can reduce VOCs by using LVP (low vapor pressure) hydrocarbon fluids that meet the LVP-VOC exemption criteria for consumer products and CO2, a non-VOC propellant.
CO2 propellants have been used with traditional 100-140 °F flash petroleum distillates in consumer products for many years. Models for can pressures have been developed, and a generalized absorption coefficient for CO2 has been adequate for these petroleum distillates. When one reformulates to less volatile hydrocarbon LVP fluids, however, a number of problems can arise if the necessary filling adjustments are not made. These problems can be avoided, and the adjustments can be easily made with knowledge of key LVP fluid properties and valve configuration performance.
Papers
Read the complete presentation available in Adobe PDF format. (71K)
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