Color electrophoretic layer including microcapsules with nonionic polymeric walls
US11747701B2 · kind B2 · utility
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103References
11Claims
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Key dates
| Filing date | Dec 22, 2020 |
| Grant date | Sep 5, 2023 |
| Priority date | — |
| Expiry date | Oct 7, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A capsule comprising a capsule wall and an electrophoretic fluid encapsulated by the capsule wall. The capsule wall comprises a cross-linked nonionic, water-soluble or water-dispersible polymer. The electrophoretic fluid comprises a suspending fluid, first pigment particles, second pigment particles, and third pigment particles. In some embodiments, the electrophoretic fluid includes a fourth electrophoretic particle. The first, second, and third particles are electrically charged, suspended in the suspending fluid, and capable of moving through the suspending fluid upon application of an electric field to the capsule.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.