Solid gel dispensers for achieving controlled release of volatile liquid materials and method for preparing same
US4891389A · kind A · utility
6Cited by
7References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 26, 1989 |
| Grant date | Jan 2, 1990 |
| Priority date | — |
| Expiry date | Jun 26, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2329/04
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Aesthetically attractive, free standing dispensers for the controlled release of volatile liquid materials such as perfumes and fragrances into the atmosphere consist essentially of composite hydrogels comprising a continuous phase of a solubilized polyvinyl alcohol, a dispersed phase comprising a polyelectrolyte and an aqueous solution of the volatile liquid that is distributed between said continuous and dispersed phases. The exterior surfaces of the dispenser remain dry to the touch throughout its useful life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.