Particles having a polymeric shell and their production
US6225372A · kind A · utility
12Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 17, 1998 |
| Grant date | May 1, 2001 |
| Priority date | — |
| Expiry date | Feb 17, 2018 |
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 stabiliser. Preferably the polymeric stabiliser 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 stabiliser 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.