BigPatents India

"A pressure-liquefied propellant mixture for aerosols, comprising dinitrogen monoxide and a hydrofluoroalkane having 1 to 3 carbon atoms, in particular 1, 1, 1, 2-tetrafluoroethane and/or 1, 1, 1, 2, 3, 3, 3-heptafluoropropane, makes possible an improvement in the wetting properties of pharmaceutically active compounds, whereby the formulation problems existing with hydrofluoroalkanes can be overcome with respect to suspension and solution aerosols and thus improved medicinal aerosol formulations can be obtained. With the aid of dinitrogen monoxide, it is also possible to influence the pressure and thus the particle size distribution specifically and, by displacement of oxygen from the hydrofluoroalkanes, to improve the storage stability of oxidation-sensitive active compounds. If desired, the propellant mixture can additionally contain carbon dioxide."