Compositions – Preservative agents – Anti-corrosion
Patent
1980-07-11
1983-04-19
Lovering, Richard D.
Compositions
Preservative agents
Anti-corrosion
53470, 252305, 424 43, B01F 500, B01J 1300
Patent
active
043805051
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to an aerosol product consisting of an active substance, propellant and solvent. Furthermore, the invention concerns a process for the production of an aerosol product as well as an apparatus for carrying out the process.
STATUS OF THE PRIOR ART
Aerosol products with different propellants have been known. Since the propellants become volatile upon atomization and at the same time may easily reach up to open spaces of combustion, it is generally demanded of them that their combustibility be lowered.
A known example for such propellants is chlorine fluorine hydrocarbons. However, their use does not seem to be quite harmless, since there at least exists the possibility that in the case of a continuous and larger expulsion into the atmosphere of the earth, an attack on the ozone belt surrounding the earth takes place which is of significance for the absorption of UV radiation.
Also propellants free of chlorine fluorohydrocarbons have been known (cf. German OS No. 2 741 882), namely with 65 to 85% by weight of 1,1,1-trichloroethane, dichloro methane or mixtures of these, 14 to 32% by weight of butane, isobutane, propane or mixtures thereof and approximately 0.5 to 5.3% by weight of carbon dioxide.
The high portion of 1,1,1-trichloroethane for many fields of application is a disadvantage in that case. For one thing, when sprayed into an open flame, as it occurs regularly in the case of laboratory experiments (flame tests, etc.) or also unintentionally in practical use, these components are subject to decomposition reactions, whereby among others hydrochloric acid may develop and for another thing, it is also risky even without any decomposition taking place, whenever a consumer comes into direct contact with those components, especially if he also inhales them along with others. This comes into consideration mainly in the case of aerosol products in the field of pharmaceutics but also in the case of numerous other aerosol products, since their liberation practically always takes place in the immediate vicinity of the consumer.
DESCRIPTION OF THE INVENTION
This is where the invention starts. It is based on the task of describing an aerosol product from which these dangers no longer emanate. Thus, the areosol product as far as its propellant is concerned, is to be distinguished by a decrease combustibility as well as by a neutral behavior concerning the environment, as well as concerning the immediate health of the consumer. Furthermore, the invention is to describe a process for the production of such an aerosol product as well as an aparatus to carry out the process.
The task is solved in the case of an aerosol product consisting of an active substance, a propellant and a solvent, in a surprisingly simple and at the same time effective manner by the fact that the propellant consists exclusively of helium, neon, argon, krypton or mixtures thereof.
This is true both for powdered sprays, foam sprays, as well as above all wetting sprays. The number of noble gases cited depends for one thing on their cost and for another thing on their physical properties.
From the German Pat. No. 1 170 909 self-propellant mixtures have been known which as propellants contain an inert gas and a halogenated methane. At the same time, the inert gas consists of a mixture of sulfuric hexafluoride and an inert, noncombustible gas, for example, also argon, helium or neon.
The German OS No. 21 31 668 concerns an anaerobic agent, especially adhesives in aerosol form, setting especially in the presence of oxygen. Beside the "anaerobic agent", there is an inert gas and oxygen present in the containers under pressure. Beside its chemical functions, the oxygen at the same time also acts as a propellant. Helium, neon and argon are mentioned among others also as inert gases.
From none of the previously mentioned printed documents does the use of noble gases as sole propellant for aerosols become clear.
Noble gases are absolutely incombustible and thus they are superior to propellants hitherto. Furthermo
REFERENCES:
patent: 3102101 (1963-08-01), Hawley et al.
patent: 3134720 (1964-05-01), Green et al.
patent: 3155574 (1964-11-01), Silson et al.
patent: 3330773 (1967-07-01), DeHart, Jr.
patent: 3361679 (1968-01-01), Paulus
Lovering Richard D.
von Treu AG
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