Process for the preparation of microcapsules
US5866153A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 8, 1995 |
| Grant date | Feb 2, 1999 |
| Priority date | — |
| Expiry date | Aug 8, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01J13/16
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The invention relates to a process for the preparation of an aqueous suspension of microcapsules having a capsule wall of polyurea and encapsulating a water-immiscible pesticide, by dispersing a solution of a polyisocyanate in the sparingly water-soluble pesticide in water and subsequently reacting the dispersion with a polyamine, which process comprises effecting the dispersion of the solution of the polyisocyanate in the sparingly water-soluble pesticide in water and the subsequent reaction of the dispersion with the polyamine in the presence of at least one water-soluble or water-dispersible nonionic surfactant of a block copolymer having at least one hydrophobic block and at least one hydrophilic block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.