Electrophoretic core-shell particles having an organic pigment core and a shell with a thin metal oxide layer and a silane layer
US12189259B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 25, 2024 |
| Grant date | Jan 7, 2025 |
| Priority date | — |
| Expiry date | Mar 25, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2202/36
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An electrophoretic medium comprises a plurality of core-shell particles and a non-polar fluid. The core-shell particles comprise an organic pigment particles core and a shell comprising a metal oxide layer and a silane layer. The metal oxide layer may have a thickness of 0.4 to 2 nm. It may be formed using a fluidized bed reactor by inserting the organic pigment into the reactor as a powder bed, contacting the powder bed with a gaseous stream comprising a metal oxide precursor and an inert gas, and contacting the powder bed with a gaseous stream of a reagent and an inert gas. The silane layer is formed from a silane compound comprising a first functional group, wherein the first functional group reacts with the metal oxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.