US 12,454,598 B2
Charge control agents and particle dispersions including the same
Eugene Bzowej, Reading, MA (US); John L. Marshall, Sedgwick, ME (US); Stephen J. Telfer, Arlington, MA (US); and Brandon Macdonald, Melrose, MA (US)
Assigned to E Ink Corporation, Billerica, MA (US)
Filed by E Ink Corporation, Billerica, MA (US)
Filed on Mar. 25, 2024, as Appl. No. 18/615,274.
Application 18/615,274 is a division of application No. 16/864,430, filed on May 1, 2020, granted, now 12,195,586.
Claims priority of provisional application 62/846,304, filed on May 10, 2019.
Prior Publication US 2024/0279391 A1, Aug. 22, 2024
Int. Cl. C08G 63/68 (2006.01); C08G 69/08 (2006.01); C09B 67/46 (2006.01); G02F 1/167 (2019.01); G02F 1/1675 (2019.01); G03G 9/097 (2006.01)
CPC C08G 63/68 (2013.01) [C08G 69/08 (2013.01); C09B 67/009 (2013.01); G03G 9/09758 (2013.01); G02F 1/167 (2013.01); G02F 2001/1678 (2013.01); G02F 2202/022 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An electrophoretic medium comprising a dispersion comprising a non-polar fluid, a plurality of charged particles and a blend of a first charge control agent and a second charge control agent, wherein the first charge control agent comprises a cationic head group and having a chemical structure according to Formula I;

OG Complex Work Unit Chemistry
wherein m is 0, 1, 2, or 3;
wherein each R is independently selected from the group consisting of an alkyl group, and an aryl group;
wherein Z is one of a branched alkanediyl group, and an unbranched alkanediyl group;
wherein n is an integer less than or equal to 20;
wherein HT is a hydrophobic moiety;
the second charge control agent being represented by Formula XV, Formula XVI, or Formula XVII;

OG Complex Work Unit Chemistry
wherein each R21, R22, R23 is independently selected from the group consisting of an alkyl group or an aryl group;
wherein v is an integer of at least 2 and less than or equal to 20;
wherein HT is a hydrophobic moiety;

OG Complex Work Unit Chemistry
wherein HT of Formulas XVI and XVII is a hydrophobic moiety comprising a functional group selected from the group consisting of poly(hydroxystearic acid), poly(ricinoleic acid), poly(isobutylene), and an unbranched or a branched alkyl group, wherein the unbranched or the branched alkyl group comprises from about 10 to about 35 carbon atoms,
and wherein the plurality of charged particles are capable of moving through the non-polar fluid upon application of an electric field.