Electrophoretic media including charge control agents comprising quartenary amines and unsaturated polymeric tails

US12084595B2 · kind B2 · utility

Assignee

• E Ink Holdings Inc. · TW

Inventors

• Ziyan Wu · Lexington, US
• Jason D. Feick · Riverview, US
• James H. ABORN · Medford, US
• John Lock · Cambridge, US
• Kosta Ladavac · Somerville, US
• Erik DUNKERLEY · Billerica, US
• Hui Du · Golden, US
• Olga Vladimirovna Barykina-Tassa · Boston, US

Key dates

• Filing date: Jul 21, 2021
• Grant date: Sep 10, 2024
• Expiry date: May 26, 2043

Classification

• Technology area (CPC G): Physics
• CPC primary: G02F2001/1678
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Improved formulations of electrophoretic media that can be incorporated into displays, front plane laminates, inverted front plane laminates, or color changing films. The formulations include a non-polar fluid, a plurality of first charged particles, and charge control agents (CCA) including a quaternary amine and an unsaturated polymeric tail comprising monomers of at least 10 carbon atoms in length. The formulations show improved switching speeds, as well as a larger dynamic range at low temperatures (i.e., below about 0° C.), where compared to state-of-the-art electrophoretic media.