Constant rate volatile composition dispensing article and process for using same
US4605165A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 1984 |
| Grant date | Aug 12, 1986 |
| Priority date | — |
| Expiry date | Jun 13, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61L9/042
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
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/m.sup.2 /day at about 25.degree. 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 m…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.