Microcapsule for electrophoretic display device, process for manufacturing the same and use thereof
US7251070B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 25, 2006 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Aug 25, 2026 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An object of the present invention is to provide a microcapsule for an electrophoretic display device which can suppress reduction in later contrast even when the electrophoretic display device is allowed to stand under the high temperature and high humidity condition, favorably, under the high temperature and high humidity condition for a long time (e.g. under 60° C., 90% RH for 24 hours). As a means of achieving this object, a microcapsule according to the present invention for an electrophoretic display device comprises an electrophoretic fine particle and a solvent both of which are encapsulated in a shell, and is characterized in that an amount of an alkaline metal ion in the whole microcapsule is 150 ppm or smaller.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.