Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
  • B65D83/00—Containers or packages with special means for dispensing contents
  • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
  • B65D83/75—Aerosol containers not provided for in groups B65D83/16 - B65D83/74
  • B65D83/752—Aerosol containers not provided for in groups B65D83/16 - B65D83/74 characterised by the use of specific products or propellants
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
  • C09K3/00—Materials not provided for elsewhere
  • C09K3/30—Materials not provided for elsewhere for aerosols

Definitions

• the present invention relates to a self-propelled powder aerosol system for use in a pressurized container adapted to deliver a dry spray of the powder in a substantially liquid-free stream of a propelling gas.
• Aerosol-type containers have achieved a great deal of popularity as means for dispensing a fluidized product.
• products such products as insecticides, agricultural compositions, anti-perspirants, body powders and medicant powders are widely used in such a manner.
• the possible applications to which an aerosol system might be applied are virtually numberless.
• the most common systems utilize a propellent gas in mixture with a liquid.
• a propellent gas When the dispensed material leaves the aerosol container in liquid form, there is no problem encountered.
• Such a container charge usually takes the form or" a mixture made up of the dispersed liquid, and a suitable propellent.
• the slurry type of mixture may be employed but only to a limited extent.
• a self-propelled aerosol system for use in a pressurized container which system contains a minor portion of a liquefiable gas propellent, and a major portion of a powdered material which is to be delivered from the container in a dry condition in a substantially liquid-free gaseous stream.
• a further object is to provide a self-propelled aerosol system for use in a pressurized container which system comprises a liquefied fluorocarbon propellent gas, and a powdered composition consisting of an active powder to be delivered from the container, and a gas-sorent carrier, the latter holding at least a portion of the propellent gas in the liquid state.
• the present self-propelled powder systems are readily distinguishable from and in many ways advantageous over the previously mentioned slurry systems.
• the liquid propellent constitutes the supporting phase whereas in a powder system, the powder is the supporting phase.
• the system is characterized by the fact that the ingredient defining the supporting phase of the composition may be added to without changing or causing an inversion in the overall system from one phase to another. For example, a phase inversion is experienced when by virtue of the addition of a certain ingredient the system changes from the powder to the slurry condition, or vice versa.
• powder or active powder as employed in the description includes a wide Variety of materials.
• powder compositions are normally compounded of several ingredients each of which serve a particular purpose, such as bulking agents, flavorants, odorants, surfactants, antiseptics and the like.
• the powder mixtures which may be dispensed by the present system includes as previously mentioned a wide variety. Essential for achieving a compatible system, however, there are certain characteristics required. Pri
• the powder composition must be capable of bold ing in an absorbed or adsorbed state all of the liquefied propellent necessary to dispense the container charge.
• the particle or mesh size of the powder imposes no strict limitation .on the operability of the system except as imposed by the aerosol container valve structure. In this respect, we have found that a desirable powder size is less than about 30 'mesh, and usually less than 100 mesh.
• the preferred propellent employed in the prevent novel system may be one of those fluids normally associated with aerosol devices or a mixture of any of said fluids.
• the propellent In order to function properly, the propellent must have a relatively low boiling point as to be vaporizable from the sorbent powder upon activation of the container valve.
• propellents which are preferred for the purpose of this invention are dichlorodifiuoromethane (Ucon l2) and dichlorotetrafluoroethane (Ucon 114).
• the inactive or carrier powder may be chosen to supplement the function of the active ingredient.
• liquid propellent is added, under pressure and/or in a chilled condition, the latter as previously described being in an amount as to be readily adsorbed or absorbed into the powder whether the latter be an active ingredient in thecharge or merely a carrier agent,
• This filling operation may be carried out at a lowered temperature thereby maintaining the propellent in a liquid condition and preventing. any substantial vaporization prior to the container being sealed.
• An alternate method for charging a container consists of first adding the powder material to the container and thence injecting the propellent in the form of a gel consisting of the liquid propellent together with a suitable gelling agent.
• a suitable gelling agent may be readily added to the powder charge where, upon being agitated, it will form the desired self-propelled container charge. In either instance, it is beneficial to permit the composition to stand for a period of time in order that the propellent may become more thoroughly dispersed throughout the powder charge.
• Agricultural dust Weight, percent Eveready Rose Dust (with 5 wt. percent Microcel B) 90 Percent Malthion (O-O-dimethyl dithiophosphate of diethyl mercaptosuccinate) 5.00 Coptan (N trichloromethylmercapto- 4-cyclohexene-1 Z-dicarboximide) 7.5 Dinitro-1-(methyl heptyl) phenyl CIO tonate a 0.90 Other nitrogen derivatives chiefly dinitro (1-methyl heptyl) pheno1 0.10 Sulfur (93% minimum through 324 mesh) 15.00 Typical diluents (such as tales, pyrohyllites, diatomaceous earths, surfactants) 71.50 Ucon 12 Total 100 Medicated powder (foot powder) Talc N0. 7 87.55 Zinc stearate 1.75 Dichlorophene 0.70 Ucon propellent (12/11 mixture 50/50) 10.00
• a three-phase self-propelling aerosol system for delivering a substantially liquid-free stream of an active powder from a pressurized container therefor, which system comprises a free-flowing powdered composition including, the active powder ingredient to be delivered, said active ingredient being only sparingly soluble in a vaporizable propellent, a second ingredient of said con1- position being highly sorbent of the vaporizable propellent, and the vaporizable propellent maintained in a sorbed condition by said powder composition under the vapor pressure of said propellent normally existing in the container at the ambient temperature, said propellent being present in the composition in sufficient amount to discharge substantially all of the active powder from the container.

Landscapes

• Chemical & Material Sciences (AREA)
• Dispersion Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Materials Engineering (AREA)
• Organic Chemistry (AREA)
• Agricultural Chemicals And Associated Chemicals (AREA)
• Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Priority Applications (2)

Applications Claiming Priority (1)

Publications (1)

Family

ID=22418067

Family Applications (1)

Country Status (2)

Cited By (23)

Citations (1)

• 1961
  • 1961-07-19 US US125071A patent/US3081223A/en not_active Expired - Lifetime
• 1969
  • 1969-12-15 BE BE743167D patent/BE743167A/xx unknown

Patent Citations (1)

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