Electrophoretic particle, electrophoretic particle dispersion liquid, display medium, and display device
An electrophoretic particle includes a polymer having at least a reactive compound represented by the following Formula (I) as a polymerizable component, at least on a surface: wherein in Formula (I), Ra represents a hydrogen atom or a methyl group, X represents a substituted or unsubstituted divalent hydrocarbon group, Y represents a substituted or unsubstituted divalent hydrocarbon group, and Z represents a hydrogen atom, or a substituted or unsubstituted monovalent hydrocarbon group.
1. An electrophoretic particle coated with a polymer comprising A) a reactive compound represented by the following Formula (I), and B) a reactive compound having a silicone chain:
wherein in Formula (I), Ra represents a hydrogen atom or a methyl group; X represents a substituted or unsubstituted divalent hydrocarbon group; Y represents a substituted or unsubstituted divalent hydrocarbon group; and Z represents a hydrogen atom, or a substituted or unsubstituted monovalent hydrocarbon group.
2. The electrophoretic particle according to claim 1 , wherein the reactive compound represented by Formula (I) is a reactive compound in which Ra represents a hydrogen atom or a methyl group, X represents an ethyl group or a propyl group, Y represents an ethyl group or a propyl group, and Z represents a hydrogen atom or a methyl group.
3. The electrophoretic particle according to claim 1 , wherein the reactive compound represented by Formula (I) is selected from the group consisting of 2-acryloyloxyethyl succinate, 2-methacryloyloxyethyl phthalic acid, 2-methacryloyloxyethyl succinate, and 2-methacryloyloxypropyl succinate.
4. The electrophoretic particle according to claim 1 , wherein a copolymerization ratio of the reactive compound represented by Formula (I) is from 1% to 50% by a molar ratio with respect to the entire polymerizable components.
5. The electrophoretic particle according to claim 1 , wherein a weight-average molecular weight of the polymer is from 500 to 1,000,000.
6. The electrophoretic particle according to claim 1 , wherein a covered or attached amount of the polymer with respect to a surface of a core particle is from 0.00001% by weight to 50% by weight with respect to the core particle.
7. The electrophoretic particle according to claim 1 , wherein the polymer is a copolymer obtained by copolymerizing the reactive compound represented by Formula (I), the reactive compound having a silicone chain, a reactive compound having a hydroxyl group, and a reactive compound having a fluorine group.
8. The electrophoretic particle according to claim 1 , wherein the polymer is a copolymer obtained by copolymerizing the reactive compound represented by Formula (I), the reactive compound having a silicone chain, a reactive compound having a hydroxyl group, a reactive compound having a phenoxy group, and a reactive compound having a fluorine group.
9. The electrophoretic particle according to claim 1 , wherein the polymer is a copolymer obtained by copolymerizing the reactive compound represented by Formula (I), the reactive compound having a silicone chain, a reactive compound having a hydroxyl group, and a reactive compound having a phenoxy group.
10. The electrophoretic particle according to claim 1 , wherein the polymer is a copolymer obtained by copolymerizing the reactive compound represented by Formula (I), the reactive compound having a silicone chain, a reactive compound having a hydroxyl group, a reactive compound having an amino group, and a reactive compound having a fluorine group.
11. The electrophoretic particle according to claim 1 , of which a volume average particle size is from 0.1 μm to 10 μm.
12. An electrophoretic particle dispersion liquid comprising:
a dispersion medium; and
a particle group that is dispersed in the dispersion medium and contains the electrophoretic particle according to claim 1 .
13. A display medium comprising:
a pair of substrates or a pair of electrodes, at least one of which has translucency; and
a region which is enclosed between the pair of substrates or between the pair of electrodes, and includes the electrophoretic particle dispersion liquid according to claim 12 .
14. A display device comprising:
the display medium according to claim 13 ; and
a voltage applying unit that applies voltage to between the pair of substrates or the pair of electrodes of the display medium.
15. The electrophoretic particle of claim 1 , wherein the reactive compound having a silicone chain as a polymerizable component comprises a dimethyl silicone compound having a terminal (meth)acrylate group.
16. The electrophoretic particle of claim 1 , wherein the reactive compound having a silicone chain as a polymerizable component comprises a branched silicone compound.