Container with microporous membrane for dispensing vapor from vo

Fluid sprinkling – spraying – and diffusing – Slow diffusers – Gravity flow of liquid from supply holder

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239 45, 239 57, A61L 904

Patent

active

049173014

ABSTRACT:
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 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. 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.

REFERENCES:
patent: 1129897 (1915-03-01), Owen, Jr.
patent: 1944375 (1934-01-01), Schneider
patent: 2219959 (1940-10-01), Laidley
patent: 2443139 (1948-06-01), Krause
patent: 2766069 (1956-10-01), Tennyson
patent: 3169705 (1965-02-01), Geiger
patent: 3727840 (1973-04-01), Nigro
patent: 3790081 (1974-02-01), Thornton
patent: 4413779 (1983-11-01), Santini

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