Fluid sprinkling – spraying – and diffusing – Slow diffusers
Patent
1995-04-13
1998-02-10
Oberleitner, Robert J.
Fluid sprinkling, spraying, and diffusing
Slow diffusers
428449, A24F 2500
Patent
active
057160007
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an emanator for volatile liquids and, in particular, to a device for dispensing liquid substances, such as fragrances, as vapours from containers thereof.
BACKGROUND OF THE INVENTION
Means for the slow release of vapour from containers of liquids are well known, particularly in the field of air fresheners and insecticides.
Commonly, a suitable substrate such as cellulose wadding impregnated with, for example, a perfume oil and/or a volatile liquid insecticidal composition is supported on a frame which is at least partly coverable by a structure limiting the exposure of the wad to the atmosphere, so to give control over the extent of treatment of the environment by a user. Such arrangements sometimes give little or no control over the rate of use by the user and certainly there is no indication of when the pad is exhausted, that is when it has become ineffective, although still possessing an odour or discoloration due to the perfume or insecticide.
Alternatively, wicks immersed at one end in a liquid contained in a clear bottle are adjustably exposed to the atmosphere at the other end from where the vapour emanates in a controllable fashion with an adjustable wick. The rate of usage is high and hence diluted liquids are necessary, which leads to relatively large bottles. In addition such arrangements are generally closable by a cap and there is a danger of spillage if the bottle is left unattended without a cap.
More recently a rupturable sachet of perfume has appeared on the market which sachet is contained in an outer sachet, both sachets being at least translucent. Such a sachet combination is mounted on a suitable framework, optionally assisting rupture of the inner sachet. These devices depend for shelf life upon the impermeability of the rupturable inner sachet membrane. Extreme care needs to be exercised in formulating a composition so that leakage during storage does not occur and fractionation of liquid through the outer membrance does not occur during use. There is a clear end-of-life indicator when the liquid is exhausted.
Coated paper has also been used in dispensers for volatile materials. Thus, FR-A-2157732 discloses an insecticide dispenser comprising an outer film which may be applied to a laminate of one or more paper layers, or may be sprayed onto a block of the other components. The preferred material for the outer film is a high density polyethylene.
JP-A-1-131663 discloses an aromatic article comprising an aromatic material packaged by processed paper obtained by laminating a viscose-processed paper onto the outside of a synthetic resin film. The viscose processing renders the film impermeable to liquids but permeable to gases.
It has also been proposed to evaporate volatile treatment liquid through a solid web of silicone material acting as a liquid phase barrier. Whilst several advantages accrue from the use of such silicone barriers, the material is expensive and consequently inflates the cost of devices incorporating relatively great thicknesses of solid silicone.
EP-A-0260896 discloses a device for dispensing a volatile liquid as a vapour, the device including a porous element provided with at least one substantially elastomeric crosslinked organopolysiloxane material produced from a prepolymer or oligomer of viscosity up to 1,000,000 mm.sup.2 sec.sup.-1 at 25.degree. C. which serves to close the pores of the support to passage of liquid and to permit the passage of vapour.
We have found that the organopolysiloxane material used with the porous element limits the types of fragrances which can be used with this device and, in practice, a clay coating has to be provided on a paper substrate, prior to application of the organopolysiloxane coating, so as to give a flat surface allowing a thin coating of the organosiloxane to be used. The clay coating is generally considered to inhibit fragrance release.
SUMMARY OF THE INVENTION
We have now developed a device which will effect the slow release of vapour from liquids containe
REFERENCES:
patent: 4445641 (1984-05-01), Baker
patent: 4634614 (1987-01-01), Holzner
patent: 4898328 (1990-02-01), Fox
Bartz C. T.
Oberleitner Robert J.
Reckitt & Colman Products Limited
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