Non-pressurized dispensing system
US4278206A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 13, 1979 |
| Grant date | Jul 14, 1981 |
| Priority date | — |
| Expiry date | Apr 13, 1999 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K3/32
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A water-in-air emulsion or suspension containing a dispensible material is formed by stabilization of small droplets of aqueous liquid with an interfacial barrier of very fine, hydrophobic metal oxide particles such as silane modified silica. As the droplets are subjected to shear such as during passage through an orifice, the shear forces experienced partially destabilize the barrier allowing the droplets to coalesce to form particles of controlled density and increased size. At least 10% of the droplets coalesce into particles after leaving the orifice. Active ingredients such as antiperspirants may be added to either the aqueous liquid phase or to the powder phase as long as they do not destabilize the suspension. A non-pressurized system comprises a container suitable for dispensing the suspension having a compartment receiving the suspension, a valve having an outlet orifice of a dimension adapted to impart a preselected shear and destabilization to the suspension and the container being adapted to enable the suspension to be propelled through the outlet orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.