Container with sorbent member and microporous membrane for...

Details Container with sorbent member and microporous membrane for... Container with sorbent member and microporous membrane for...

A - Human Necessities

61

L

222/20

A61L 9/12 (2006.01) A61L 9/01 (2006.01)

Patent

CA 2002882

TITLE: A CONTAINER WITH SORBENT MEMBER AND MICROPOROUS MEMBRANE FOR DISPENSING VAPOR FROM VOLATILE LIQUID ABSTRACT OF THE DISCLOSURE Volatile substances such as fragrances, perfumes, deodorizers, room freshener compositions and the like are dispensed in vapor phase from a container holding the substance in liquid phase at room temperature and under atmospheric pressure. The container has a window covered with a microporous membrane with an active structure formed from a material having a critical surface tension that is below the surface tension of the liquid substance. Generally the active membrane material has a critical surface tension that is below 22 dynes/cm and preferably below 20 dynes/cm while the surface tension of the liquid is at least 22 dynes/cm. One example is an ultraviolet irradiated polymer composition with 0.2 microns nominal pore size. In all instances the volatile substance is first sorbed within a porous element and desorbed therefrom for transport through the membrane only in its vapor phase.

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