Method for producing microcapsules having improved wall characteristics
US6620571B2 · kind B2 · utility
8Cited by
22References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 17, 2000 |
| Grant date | Sep 16, 2003 |
| Priority date | — |
| Expiry date | Mar 17, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2987
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for forming microcapsules having substantially impermeable microcapsule walls comprising the steps of: forming an emulsion of an internal phase in a continuous aqueous phase, the internal phase including a photosensitive composition and a polyvalent isocyanate, the continuous aqueous phase including a sulfonated polystyrene, at least one of the internal phase or the continuous aqueous phase further including a hydrophilic polymer; and enwrapping particles of the internal phase in an amine-formaldehyde condensation product produced by in situ condensation of an amine and formaldehyde is disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.