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Aerosol containers for foaming and delivering aerosols and process

  • US 3,970,219 A
  • Filed: 03/03/1975
  • Issued: 07/20/1976
  • Est. Priority Date: 03/03/1975
  • Status: Expired due to Term
First Claim
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1. 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 propellant gas compartment is in flow connection with the valve passage only via the first foam compartment; and

    porous bubbler means interposed between and providing the only flow communication between the first and second compartments, and having a plurality of 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 in the first foam compartment across the line of flow from the bubbler to the valve, thereby to foam the aerosol composition in the first foam compartment upon opening of the valve to atmospheric pressure, and to expel foamed aerosol composition through the open valve.

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