CHARGE CONTROL AGENTS AND PARTICLE DISPERSIONS INCLUDING THE SAME

• Main Authors: BZOWEJ, Eugene, MARSHALL, John L, TELFER, Stephen J, MACDONALD, Brandon
• Format: Patent
• Language: English; French
• Published: 19.11.2020
• Subjects: CHEMISTRY; CINEMATOGRAPHY; COMPOSITIONS BASED THEREON; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; FREQUENCY-CHANGING; HOLOGRAPHY; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MAGNETOGRAPHY; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PHOTOGRAPHY; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP

Mixtures are disclosed containing a plurality of charged pigment particles and a one or more charge control agents. At least one of the charge control agents has a chemical structure that includes a cationic head group, such as an ammonium cation or an iminium compound, and a non-ionic, polar functional group, other than an acyclic secondary amide group. The mixtures are useful as dispersions for forming electrophoretic media that may be incorporated into electrophoretic displays. Alternatively, the dispersions may be useful for forming electrophotographic toners and dispersions for other printing applications. La présente invention concerne des mélanges qui contiennent une pluralité de particules de pigment chargées et un ou plusieurs agents de contrôle de charge. Au moins un des agents de contrôle de charge a une structure chimique qui comprend un groupe de tête cationique, tel qu'un cation ammonium ou un composé iminium, et un groupe fonctionnel polaire non ionique, autre qu'un groupe amide secondaire acyclique. Les mélanges sont utiles en tant que dispersions pour former des supports électrophorétiques qui peuvent être incorporés dans des affichages électrophorétiques. En variante, les dispersions peuvent être utiles pour former des encres en poudre et des dispersions électrophotographiques pour d'autres applications d'impression.