Process with photopolymerization for preparing microcapsules of controlled size
US10850247B2 · kind B2 · utility
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12Claims
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Key dates
| Filing date | Nov 27, 2019 |
| Grant date | Dec 1, 2020 |
| Priority date | — |
| Expiry date | Nov 27, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF28D20/023
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
Solid microcapsules are prepared by adding, with stirring, a composition having at least one active ingredient to a photocrosslinkable polymeric composition to obtain an emulsion, and adding the emulsion, with stirring, to a viscous composition. The viscosity of the viscous composition is greater than 2000 mPa·s at 25° C. A double emulsion is obtained, to which shear is applied at a rate less than 1000 s−1, to obtain a sheared emulsion. Polymerization of the sheared emulsion is accomplished by photopolymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.