Devices for perfuming ambient air and enclosed spaces

Details Devices for perfuming ambient air and enclosed spaces Devices for perfuming ambient air and enclosed spaces

1984-09-13

1987-01-06

Kittle, John E.

Stock material or miscellaneous articles

Hollow or container type article

Cellular material derived from plant or animal source

428 76, 428905, 2064841, 2064842, 239 55, 239 57, A61L 904

Patent

active

046346147

DESCRIPTION:

BRIEF SUMMARY
The international application WO No. 81/00051 published on Jan. 22, 1981 discloses an object which is impervious to liquids and is intended for perfuming ambient air or enclosed spaces, characterized in that it contains a perfuming composition enriched with substances which may or may not be fragrant and have low polarity and in that the object has at least one polymeric wall enabling active fragrant ingredients to be diffused towards the exterior.
The French patent application FR A No. 20 91 855, published on Jan. 21, 1972, relates to a device for the continuous diffusion of purifying agent vapours, which device comprises a permeation wall made of macromolecular material, one face of which is in contact with the volatile purifying agent which impregnates a fibrous mass covered by the permeation wall.
The French patent application FR A No. 23 36 946, published on July 29, 1977, relates to a slow diffusion air-freshening system which comprises a chamber and a perfume contained in the said chamber, at least one surface of the said chamber being a polymer film. Likewise in this system the perfume is impregnated in a support such as silica, talc, glass wool or blotting paper.
The U.S. Pat. No. 3,578,545, published on May 11, 1971, relates to a flexible laminated substance releasing a perfume and comprising a fabric support impregnated with a perfume, surrounded by a porous plastic film and permeable to perfume vapours.
The U.S. Pat. No. 4,161,283, published on July 17, 1979, describes a device for continuously diffusing purifying vapours; the said device comprises an outer wall formed by a polymeric material enabling molecular diffusion and an impermeable inner wall. The outer wall is in addition covered with an impermeable sheet suitable for preventing the diffusion of the active volatile substances during storage.
A similar device is described in the U.S. Pat. No. 4,285, 468, published on Aug. 25, 1981.
As the purifying articles described in the prior art are all constituted by a system comprising a polymeric diffusion wall, they should have a device for preventing the active perfuming elements from diffusing into the environment during storage.
To this end, the international application WO No. 81/00051 describes a method consisting in applying a Surlyn.RTM. type polymeric sheet (origin: Du Pont de Nemours) on the walls, through which diffusion normally occurs. This type of polymeric sheet may adhere by hot welding to polyethylene or polypropylene and be detached just before use. For the same purpose, a further method consists in using aluminium sheets welded to polypropylene foam.
A problem arises, however, during extended storage of such devices before they are sold; owing to the diffusion of the perfume vapours through the polymeric walls of the packing, an appreciable loss of the initial amount of the active substance has been observed. In order to overcome this disadvantage, a multi-chamber device has recently been developed (cf. international patent application WO No. 82/02700 published on Aug. 19, 1982). In a device of this type, the active perfuming substance is kept in a compartment having walls which are impermeable to perfume vapours and one join of which may be broken under the effect of external pressure and subsequently, just before use, when the walls of the said join have been broken, the solution passes into a compartment having walls made of polymeric material permeable with respect to the perfume vapours which can then diffuse uniformly into the ambient atmosphere.
A device of this type is highly efficient in use, however the manufacture thereof requires an improved apparatus to be produced and a rigorous assembly procedure.
In order to remedy such disadvantages the present invention proposes a novel solution based on a simple procedure.
The principle on which the invention is based consists in the direct assembly by welding of a thin layer of paper on the external wall of the polymeric membrane through which the diffusion of the active substance vapours occurs. This thin paper layer is th

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patent: 4285468 (1981-08-01), Hyman

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