Membrane-gel diffusion device

Details Membrane-gel diffusion device Membrane-gel diffusion device

1987-03-27

1989-03-07

Kashnikow, Andres

Fluid sprinkling, spraying, and diffusing

Slow diffusers

Solid form vaporizable material

239 57, 424 761, A61L 904

Patent

active

048099120

ABSTRACT:
A method for the fabrication of a continuous action reservoir type air freshening device is described. The device is characterized by the use of an evaporation rate controlling porous membrane which is in intimate contact and completely covers the exposed surface of an erodible gel-type of solid perfume composition. The fragranced gel is enclosed in a container, one end of which is open and over which is affixed the porous membrane. One side of this membrane is exposed to the atmosphere; the other side intimately contacts the solid reservoir consisting of the fragrance gel. Transmission of the volatile fragrance and carrier agents to the surrounding environment through the porous membrane matrix occurs as a function of an evaporative process. The membrane permits only a limited penetration, if any by the gel solution, i.e. in the liquid state, but is sufficiently permeable to the gel solution to establish physical attachment between the solidified gel and the membrane.

REFERENCES:
patent: 3985298 (1976-10-01), Nichols
patent: 4157787 (1979-06-01), Schwartz
patent: 4161283 (1979-07-01), Hyman
patent: 4248380 (1981-02-01), Lee et al.
patent: 4356969 (1982-11-01), Obermayer et al.
patent: 4399942 (1983-08-01), Chand
patent: 4634614 (1987-01-01), Holzner
patent: 4755377 (1988-07-01), Steer

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