Display particle and method for producing the same, display particle dispersion, display medium, and display device
A display particle includes: a colored particle including a polymer having a charging group and a colorant; and a reactive silicone polymer or a reactive long-chain alkyl polymer, the polymer being bound to or covering the surface of the colored particle.
1. A display particle, comprising:
a colored particle including a polymer having a charging group and a colorant; and
a reactive silicone polymer or a reactive long-chain alkyl polymer, the polymer being bound to or covering the surface of the colored particle:
wherein the polymer having a charging group has a weight-average molecular weight of from 1,000 to 1,000,000, and the charging group comprises a cationic group or an anionic group.
2. The display particle of claim 1 , wherein the reactive silicone polymer comprises a copolymer including a silicone chain component, a reactive component, and another copolymerizable component.
3. The display particle of claim 1 , wherein the reactive silicone polymer or the reactive long-chain alkyl polymer has a weight-average molecular weight of from about 1,000 to about 1,000,000.
4. The display particle of claim 1 , wherein the reactive long-chain alkyl polymer comprises a copolymer including a long-chain alkyl chain component, a reactive component, and another copolymerizable component.
5. The display particle of claim 4 , wherein the long-chain alkyl chain component includes an alkyl chain having 4 or more carbon atoms.
6. A display particle dispersion, comprising:
a particle group including the display particles of claim 1 ; and
a dispersion medium in which the particle group is dispersed.
7. The display particle dispersion of claim 6 , wherein the dispersion medium comprises silicone oil.
8. The display particle dispersion of claim 6 , wherein the dispersion medium comprises a paraffin hydrocarbon solvent.
9. The display particle dispersion of claim 6 , wherein the display particles included in the particle group have different charging polarities.
10. A display medium, comprising:
a pair of substrates, at least one of which transmits light; and
the display particle dispersion of claim 6 , which is enclosed in a space between the pair of substrates.
11. A display device, comprising:
the display medium of claim 10 ; and
a voltage application unit which applies a voltage between the pair of substrates of the display medium.
12. A display medium, comprising:
a pair of electrodes, at least one of which transmits light; and
the display particle dispersion of claim 6 , which is enclosed in a space between the pair of electrodes.
13. A display device, comprising:
the display medium of claim 12 ; and
a voltage application unit which applies a voltage between the pair of substrates of the display medium.
14. A method for producing a display particle, comprising:
stirring and emulsifying a mixed solution including i) a polymer having a charging group, ii) a colorant, iii) a reactive silicone polymer or a reactive long-chain alkyl polymer, iv) a first solvent, and v) a second solvent which is incompatible with the first solvent, has a boiling point lower than that of the first solvent, and dissolves the polymer having a charging group;
removing the second solvent from the emulsified mixed solution to produce a colored particle including the polymer having a charging group and the colorant; and
reacting the reactive silicone polymer or the reactive long-chain alkyl polymer with the colored particle so that it binds to the surface of the colored particle or covers the surface of the colored particle;
wherein the polymer having a charging group has a weight-average molecular weight of from 1,000 to 1,000,000, and the charging group comprises a cationic group or an anionic group.
15. The method for producing a display particle of claim 14 , wherein the first solvent comprises silicone oil.
16. The method for producing a display particle of claim 14 , wherein the first solvent comprises a paraffin hydrocarbon solvent.
17. A display particle, comprising:
a colored particle including a polymer having a charging group and a colorant; and
a reactive silicone polymer or a reactive long-chain alkyl polymer, the polymer being bound to or covering the surface of the colored particle;
wherein the reactive long-chain alkyl polymer comprises a copolymer including a long-chain alkyl chain component, a reactive component, and another copolymerizable component.
18. The display particle of claim 17 , wherein the long-chain alkyl chain component includes an alkyl chain having 4 or more carbon atoms.
19. A display particle dispersion, comprising:
a particle group including display particles that each comprise:
a colored particle including a polymer having a charging group and a colorant; and
a reactive silicone polymer or a reactive long-chain alkyl polymer, the polymer being bound to or covering the surface of the colored particle; and
a dispersion medium in which the particle group is dispersed, wherein the dispersion medium comprises a paraffin hydrocarbon solvent.
20. A method for producing a display particle, comprising:
stirring and emulsifying a mixed solution including i) a polymer having a charging group, ii) a colorant, iii) a reactive silicone polymer or a reactive long-chain alkyl polymer, iv) a first solvent, and v) a second solvent which is incompatible with the first solvent, has a boiling point lower than that of the first solvent, and dissolves the polymer having a charging group;
removing the second solvent from the emulsified mixed solution to produce a colored particle including the polymer having a charging group and the colorant; and
reacting the reactive silicone polymer or the reactive long-chain alkyl polymer with the colored particle so that it binds to the surface of the colored particle or covers the surface of the colored particle;
wherein the first solvent comprises a paraffin hydrocarbon solvent.