초록 ▼

Described is an article useful for dispensing at a constant rate, continuously or discontinuously for discrete periods of time a volatile composition of matter such as an air freshener or perfume composition into the atmosphere surrounding said article, the article being a hollow totally enclosed fl

Described is an article useful for dispensing at a constant rate, continuously or discontinuously for discrete periods of time a volatile composition of matter such as an air freshener or perfume composition into the atmosphere surrounding said article, the article being a hollow totally enclosed flexible, rigid or partially flexible-partially rigid structure comprising a thin shell totally enclosing an inner void with part of the thin shell comprising a microporous polymer containing a plurality of finite solid filler particles whereby when the article is located in the ambient environment, the volatile material molecules are transported through the porous polymer at a substantially constant mass flow rate both of the individual volatile components and totally through the porous polymer. The functioning of the article is enabled because the microporous polymer section has (i) the property of transporting water vapor at a rate of between 50 up to 1000 g/m2/day at about 25°C. and at about 50% relative humidity at about atmospheric pressure and having an air transport rate of 100-20,000 Gurley seconds and a thickness in the range of from about 0.01 mils up to about 20 mils.

대표청구항 ▼

A hollow totally enclosed structure capable of the release into the space surrounding said structure at a substantially constant rate of at least one volatile consumable material consisting of volatile consumable material molecules, said volatile consumable material being selected from the group con

A hollow totally enclosed structure capable of the release into the space surrounding said structure at a substantially constant rate of at least one volatile consumable material consisting of volatile consumable material molecules, said volatile consumable material being selected from the group consisting of: perfume compositions, herbicide compositions, insecticide compositions, animal repellent compositions, air freshener compositions, pheromone compositions, odor maskant compositions, deodorant compositions, insect repellent compositions and compositions for the evaluation of olfactory funtioning in humans; said structure comprising (i) a thin shell totally enclosing an inner void with at least a first finite section of said thin shell being a microporous polymer shell section consisting of a porous membrane having (1) the property of transporting water vapor at a rate of from about 50 g/m2/day up to about 1000 g/m2/day at about 25°C. and at about 50% relative humidity at about atmospheric pressure and having an air transport rate of 100-20,000 Gurly seconds (Gs) and (2) a thickness in the range of from about 0.01 mils up to about 20 mils; the remaining second section of said thin shell having a porosity equal to or less than the porosity of said first finite section, said microporous polymer shell section consisting essentially of a polyolefin intimately admixed with a powder having an average particle diameter of from about 0.3 up to about 500 microns, said powder being a filler material incompatible with said polymer, said powder being in a proportion of from about 5 to 100 parts by weight per 100 parts by weight of polymer, the said volatile composition having a volatility at ambient conditions which is higher than the transmissibility of said microporous polymer shell section, and (ii) located within said inner void on a portion of said second section, said volatile consumable material, releasably entrapped in a gel.