Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-04-03
1998-07-14
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
512 4, A61L 904
Patent
active
057805270
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to perfumery and more particularly it concerns a perfuming device for purifying ambient air and enclosed spaces.
PRIOR ART
The utilisation of various devices for purifying ambient air has markedly increased in recent years. Air-deodorisers, for example, have henceforth become of current use in practically all households where they are used to mask bad odours as well as to impart ambient fragrances. The same applies to public places, e.g. offices or cars.
The solutions applied for the manufacture of this sort of devices are extremely varied. By way of example, one can mention here the systems based on the rapid diffusion of sanitising agents, which diffusion is promoted by the action of dispersing devices of spray type, aerosol or mechanical. Also known are solid devices consisting of elements impregnated with active sanitising ingredients, which elements are constituted by gels, such as agar-agar or sodium stearate gels, or by synthetic resin or mineral material blocks, e.g. plaster or silica. The prior art is also rich in examples wherein the deodorising devices are constituted by plastic packing elements enclosing the active ingredients in liquid form and wherein the diffusion of the sanitising vapours can take place through polymer semi-permeable walls. Finally, well-known are also the devices wherein the diffusion occurs by means of a wick put into contact, at one of its ends, with a sanitising liquid.
By experience, it is apparent that none of the existing systems can satisfy all the criteria of functionality and aesthetics required for a general use, some devices being more suitable for pulse perfuming of small or large spaces, others, on the contrary, more adapted for continuous sanitization.
Amongst the simple systems of proved efficacy one can find those based on the difflusion of sanitising agents wherein the support is constituted by a gelified material. They are devices which use in general the gelifying properties of carrageenans or alginates.
DESCRIPTION OF THE INVENTION
We have now discovered that it was possible to obtain gels, suitable as a support in deodorising or sanitising devices, by reacting, in the presence of a perfuming base, a liquid polymeric material with a cross-linking agent.
As it will become more apparent at the reading of the specific examples given hereinafter, the devices thus prepared offer several advantages over the prior art devices. In this respect, one can mention the fact that the support, once shaped, appears as a rigid dry and transparent material, which can contain a large proportion of perfume base, of up to 90% or more. This last feature is particularly important since the devices of the invention can accordingly be used in the form of discreet articles of small dimension, notwithstanding of good effectiveness. Thus, for example, these devices can find a utilisation to perfume closed small spaces such as cars, bathrooms, lavatories and so on. Owing to their transparency, they can be shaped in various and aesthetically appealing forms. What is more, their manufacture is very simple since, once homogenised, the polymer reaction mixture containing the perfuming base occurs in the form of a liquid which can be easily poured into moulds of the desired appropriate and varied form.
Lastly, solid articles can be shaped by reducing somewhat the proportion of the perfume base --e.g. to about 70% by weight relative to the weight of the polymer material --and by adding to the reaction mixture filling agents such as plaster, sawdust, metal powder or other similar materials.
We have discovered that certain functionalised polymers could be cross-linked in situ, in the presence of a perfume base, to form a gel which possessed the above-mentioned features.
The present invention provides a device for the perfuming, deodorising or sanitising of ambient air or closed spaces, which device comprises a gelified element resulting from the in situ cross-linking of a polymer, or a copolymer, in the presence of a perfuming, deodorisi
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Firmenich SA
Michl Paul R.
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