Process for preparing an emulsion whose organic phase is of high viscosity
US7288575B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2005 |
| Grant date | Oct 30, 2007 |
| Priority date | — |
| Expiry date | Jun 6, 2025 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61K2800/54
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
The invention concerns a method for preparing an oil-in-water emulsion whereof the organic phase has a viscosity not less than 1 Pa.s, which consists in using an aqueous phase comprising at least a heat-thickening polymer having a viscosity jump between 25 and 80° C. so that the value of the ratio log 10 (viscosity at 80° C.)/log 10 (viscosity at 25° C.) is at least equal to 1, preferably at least equal to 2, the variation in viscosity being reversible; the amount of heat-thickening polymer being such that the aqueous phase viscosity is 0.2 to 5 times that of the organic phase at the temperature for preparing the emulsion; the latter being not less than the thickening temperature of the heat-thickening polymer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.