Method for preparing microcapsules by double emulsion
US10807060B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 2016 |
| Grant date | Oct 20, 2020 |
| Priority date | — |
| Expiry date | Apr 1, 2037 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/14
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
A method for preparing solid microcapsules, comprising the steps of adding under agitation a composition C1 comprising at least one active material to a cross-linkable liquid composition C2, the active material is not an additive to be used in the lubricant, fuel or bitumen industries, drilling sludges or muds, or oil exploration/production, compositions C1 and C2 being immiscible with each other. A first emulsion is obtained comprising droplets of composition C1 dispersed in composition C2, adding under agitation the first emulsion to a liquid composition C3, composition C3 and composition C2 being immiscible with each other, to obtain a second emulsion comprising droplets dispersed in composition C3. Loading the second emulsion in a mixer which applies a homogeneous controlled shear rate to said second emulsion, said shear rate being from 1 000 s-1 to 100 000 s-1, to obtain a third emulsion comprising droplets dispersed in composition C3, and cross-linking the droplets so that solid microcapsules dispersed in composition C3 are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.