Electrophoretic particle, manufacturing method of electrophoretic particle, electrophoretic dispersed liquid, electrophoretic sheet, electrophoretic apparatus, and electronic equipment
View Patent ↗An electrophoretic particle of the invention include: a mother particle; and a covering layer, wherein the covering layer includes a plurality of polymers, each of which includes a polymerization initiator which includes a polymerization initiation group linked to a surface of the mother particle and polymerization parts in which monomers are polymerized from the polymerization initiation group as a starting point, wherein each of the polymer include the polymerization initiator, a first polymerization part, which is coupled to the polymerization initiator, in which first monomers that includes monomers with cross-linking groups are polymerized, and a second polymerization part in which second monomers that does not include monomers with cross-linking groups are polymerized, and the polymers are linked to each other at the cross-linking groups of the first polymerization parts via cross-linking agent.
1. An electrophoretic particle comprising:
a mother particle; and
a covering layer which covers at least a part of the mother particle,
wherein the covering layer includes a plurality of polymers, each of the polymers including a polymerization initiator which includes a polymerization initiation group linked to a surface of the mother particle and polymerization parts in which monomers are polymerized in living radical polymerization from the polymerization initiation group as a starting point, and
wherein each of the polymers includes the polymerization initiator, a first polymerization part, which is coupled to the polymerization initiator, in which first monomers that include monomers with cross-linking groups are polymerized in living radical polymerization, and a second polymerization part, which is coupled to the first polymerization part, in which second monomers that does not include monomers with cross-inking groups are polymerized in living radical polymerization, and the polymers are linked to each other at the cross-linking groups of the first polymerization parts via cross-linking agent.
2. The electrophoretic particle according to claim 1 ,
wherein the first monomers include monomers containing epoxy groups as the cross-linking groups.
3. The electrophoretic particle according to claim 1 ,
wherein the second monomers include non-ionic monomers.
4. The electrophoretic particle according to claim 1 ,
wherein the second monomers include cationic monomers.
5. The electrophoretic particle according to claim 1 ,
wherein the second monomers include anionic monomers.
6. The electrophoretic particle according to claim 1 ,
wherein the polymerization initiator is silane coupling agent.
7. The electrophoretic particle according to claim 1 ,
wherein the polymerization initiation group is polymerized in atom transfer radical polymerization.
8. The electrophoretic particle according to claim 1 ,
wherein a linkage degree of the polymers to the surface of the mother particle is not less than 0.01 chains/nm 2 and not more than 0.5 chains/nm 2 .
9. A manufacturing method of an electrophoretic particle which includes a mother particle and a covering layer which covers at least a part of the mother particle, the method comprising:
preparing the mother particle and linking a plurality of polymerization initiators with polymerization initiation groups to a surface of the mother particle in a first process; and
polymerizing first monomers with cross-linking groups in living radical polymerization from the polymerization initiation groups as starting points, then polymerizing second monomers with no cross-linking groups in living radical polymerization, coupling the cross-linking groups via cross-linking agent, and forming polymerization parts configured by first polymerization parts and second polymerization parts to obtain a plurality of polymers in a second process.
10. The manufacturing method of an electrophoretic particle according to claim 9 ,
wherein in the second process, the cross-linking groups are linked via the cross-linking agent prior to the polymerization of the second monomers.
11. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 1 .
12. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 2 .
13. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 3 .
14. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 4 .
15. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 5 .
16. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 6 .
17. Electrophoretic dispersed liquid comprising:
the electrophoretic particle according to claim 7 .
18. An electrophoretic sheet comprising:
a substrate; and
a plurality of constituents which are arranged above the substrate to respectively accommodate the electrophoretic dispersed liquid in claim 11 therein.
19. An electrophoretic apparatus comprising:
the electrophoretic sheet according to claim 18 .
20. Electronic equipment comprising:
the electrophoretic apparatus according to claim 19 .