Method for preparing capsules with improved retention properties and capsules obtained therefrom
US11033872B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2018 |
| Grant date | Jun 15, 2021 |
| Priority date | — |
| Expiry date | Mar 21, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/48
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a capsule preparation method for preparing solid microcapsules, comprising the following steps:a) addition, under agitation, a composition C1, comprising at least one active ingredient, to a polymeric composition C2, the compositions C1 and C2 being mutually immiscible, whereby an emulsion (E1) is obtained comprising droplets of the composition C1 dispersed in the composition C2;b) addition, under agitation, the emulsion (E1) to a composition C3, the compositions C2 and C3 being mutually immiscible, whereby a double emulsion (E2) is obtained comprising droplets dispersed in the composition C3;c) applying shear to the emulsion (E2), whereby a double emulsion (E3) is obtained comprising size controlled droplets dispersed in the composition C3; andd) polymerising the composition C2, whereby solid microcapsules dispersed in the composition C3 are obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.