Aerosol containers for foaming and delivering aerosols and process

An aerosol container for foaming an aerosol composition therein prior to expulsion from the container, and then expelling the resulting foam, comprising, in combination, a pressurizable container having a valve movable between open and closed positions, with a valve stem, a foam conveying passage therethrough and a delivery port in flow connection therewith;

• bias means for holding the valve in a closed position;
• and means for manipulating the valve against the bias means to an open position, for expulsion of aerosol foamed composition within the container via the valve passage and delivery port;
• means defining at least two separate compartments in the container of which a first compartment is in direct flow connection with the valve passage, and a second compartment is in flow connection with the valve passage only via the first compartment;
• and porous bubbler means having through pores interposed between the first and second compartments with the through pores communicating the compartments, the pores being of sufficiently small dimensions to restrict flow of propellant gas from the second compartment therethrough and form bubbles of such gas in liquid aerosol composition across the line of flow from the bubbler to the valve, thereby to foam the aerosol composition upon opening of the valve to atmospheric pressure, and to expel foamed aerosol composition through the open valve, and a wick extending into the second compartment from the porous bubbler.

An aerosol container for foaming an aerosol composition therein prior to expulsion from the container, and then expelling the resulting foam, comprising, in combination, a pressurizable container having a valve movable between open and closed positions, with a valve stem, a foam-conveying passage therethrough and a delivery port in flow connection therewith;

• bias means for holding the valve in a closed position;
• and means for manipulating the valve against the bias means to an open position, for expulsion of aerosol foamed composition within the container via the valve passage and delivery port;
• means defining at least two separate compartments in the container, of which a first compartment is in direct flow connection with the valve passage, and a second compartment is in flow connection with the valve passage only via the first compartment;
• two porous bubbler means, one interposed at one end of the first foam compartment and one interposed in the first foam compartment adjacen the valve, both being across the line of flow through the first foam compartment to the valve;
• each porous bubbler means having through pores, the first mentioned porous bubbler means being interposed between the first and second compartments with the through pores communicating the compartments, the pores being of sufficiently small dimensions to restrict flow of propellant gas from the second compartment therethrough and form bubbles of such gas in liquid aerosol composition across the line of flow from the bubbler to the valve, thereby to foam the aerosol composition upon opening of the valve to atmospheric pressure, and to expel foamed aerosol composition through the open valve.

An aerosol container for foaming an aerosol composition therein prior to expulsion from the container, and then expelling the resulting foam, comprising, in combination, a pressurizable container having a valve movable between open and closed positions, with a valve stem, a foam-conveying passage therethrough and a delivery port in flow connection therewith;

• bias means for holding the valve in a closed position, for expulsion of aerosol foamed composition within the container via the valve passage and delivery port;
• means defining at least two separate compartments in the container of which a first foam compartment containing liquid aerosol composition to be foamed and expelled is in direct flow connection with the valve passage, and a second propellant compartment containing propellant and outside the first compartment is in flow connection with the valve passge only via the first compartment;
• substantially all of the liquid aerosol composition to be foamed being retained in the first compartment, and substantially all of the propellant being retained in the second compartment;
• and porous bubbler means having through pores interposed between the first and second compartments with the through pores communicating the compartments, the pores being of sufficiently small dimensions to restrict flow of propellant from the second compartment therethrough and form bubbles of propellant gas in liquid aerosol composition across the line of flow from the bubbler to the valve, thereby to foam the aerosol composition in the first compartment upon opening of the valve to atmospheric pressure, and to expel foamed aerosol composition through the open valve.

An aerosol container for foaming an aerosol composition therein prior to expulsion from the container, and then expelling the resulting foam, comprising, in combination, a pressurizable container having a valve movable between open and closed positions, with a valve stem, a foam-conveying passage therethrough and a delivery port in flow connection therewith;

• bias means for holding the valve in a closed position;
• and means for manipulating the valve against the bias means to an open position, for expulsion of aerosol foamed composition within the container via the valve passage and delivery port;
• means defining at least two separate compartments in the container, of which a first foam compartment is in direct flow connection with the valve passage, and a second compartment is in flow connection with the valve passage only via the first compartment;
• and porous bubbler means having through pores interposed between the first foam compartment to the valve with the through pores communicating the compartments;
• the porous bubbler retaining within its pores liquid aerosol composition to be foamed and expelled;
• and the pores being of sufficiently small dimensions to restrict flow of propellant gas from the second compartment therethrough and form bubbles of such gas in liquid aerosol composition, thereby to foam the aerosol composition upon opening of the valve to atmospheric pressure, and to expel foamed aerosol composition through the open valve.