Electrophoretic medium comprising a mixture of charge control agents
AssigneeE Ink California, LLC
InventorsHui DU, Joshua A. RITCHEY, Olga Vladimirovna BARYKINA-TASSA, Vladimir SOFIYEV
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Abstract
An electrophoretic medium including a mixture of charge control agents, for example quaternary amine salts of polyisobutylene combined with quaternary amine salts of polyesters. The described electrophoretic medium exhibits improved color saturation as compared to similar electrophoretic media having only one of the charge control agents.
Claims21
An electrophoretic medium comprising:
- a first set of charged particles;
- a non-polar fluid;
- a first charge control agent comprising a quaternary amine and a branched hydrocarbon tail of between 20 and 1000 carbon atoms in length;
- and
- a second charge control agent comprising a quaternary amine and a linear polyisobutylene tail of between 12 and 500 carbon atoms in length.
The electrophoretic medium of claim 20, further comprising a third set of charged particles dispersed in the non-polar fluid, wherein the third set of charged particles is not white and not black. 22, The electrophoretic medium of claim 21, wherein the third set of charged particles is yellow or red.
Dependencies are inferred from the claim text.