Particles having a polymeric shell and their production
US6359031B1 · kind B1 · utility
37Cited by
1References
20Claims
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Key dates
| Filing date | Nov 27, 2000 |
| Grant date | Mar 19, 2002 |
| Priority date | — |
| Expiry date | Nov 27, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31725
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Particles have a hydrophilic core, for instance including an enzyme and a polymer, surrounded by a shell formed by interfacial condensation polymerisation in the presence of a polymeric stabilizer. Preferably the polymeric stabilizer is a random copolymer which will concentrate at the interface between oil and water and association by ionic interaction, condensation or otherwise is achieved between the stabilizer and one of the reactants before reaction with the other reactant. Dispersions of aqueous capsules in an aqueous medium are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.