Particle for display, particle dispersion liquid for display, display medium, and display device
A particle for a display includes a colored particle containing a colorant and a polymer having a chargeable group; and a polymer gel layer that covers a surface of the colored particle and contains a polymer gel.
1. A particle for a display comprising:
a colored particle containing a colorant and a polymer having a chargeable group; and
a polymer gel layer that covers a surface of the colored particle and contains a polymer gel, wherein the particle satisfies the following conditions (i) or (ii):
(i) the polymer gel layer being chemically bonded to the surface of the colored particle; or
(ii) the particle comprising, between the colored particle and the polymer gel layer, a non-crosslinked structure of a first reactive silicone polymer or a non-crosslinked structure of a first non-crosslinked reactive long-chain alkyl polymer, the non-crosslinked structure being bonded to or covering the surface of the colored particle.
2. The particle for a display according to claim 1 , wherein the polymer gel comprises at least a crosslinked structure of a reactive silicone polymer or a crosslinked structure of a reactive long-chain alkyl polymer.
3. The particle for a display according to claim 1 , wherein the polymer gel is formed of a material that does not contain a chargeable group whose charging polarity is the same as that of the chargeable group of the colored particle.
4. The particle for a display according to claim 1 , wherein the particle satisfies condition (ii).
5. The particle for a display according to claim 4 , wherein the polymer gel layer is formed by, after providing the non-crosslinked first reactive silicone polymer or the non-crosslinked first reactive long-chain alkyl polymer so as to bond to or cover the surface of the colored particle, providing a second reactive silicone polymer or a second reactive long-chain alkyl polymer, which is different from the first reactive silicone polymer or the first reactive long-chain alkyl polymer, so as to cause the second reactive silicone polymer or the second reactive long-chain alkyl polymer to react with the first reactive silicone polymer or the first reactive long-chain alkyl polymer and so as to crosslink the second reactive silicone polymer or the second reactive long-chain alkyl polymer.
6. A particle dispersion liquid for a display comprising:
a group of particles including the particle for a display according to claim 1 ; and
a dispersion medium in which the group of particles is dispersed.
7. The particle dispersion liquid for a display according to claim 6 , wherein the dispersion medium is silicone oil.
8. The particle dispersion liquid for a display according to claim 6 , wherein the dispersion medium is a paraffin hydrocarbon solvent.
9. The particle dispersion liquid for a display according to claim 6 , wherein the group of particles includes plural kinds of particles for a display and the plural kinds of particles include kinds of particles having different charge polarities from each other.
10. A display medium comprising:
a pair of substrates, at least one of which transmits light; and
the particle dispersion liquid for a display according to claim 6 , which is disposed and sealed between the pair of substrates.
11. A display medium comprising:
a pair of electrodes, at least one of which transmits light; and
an area disposed between the pair of electrodes and containing the particle dispersion liquid for a display according to claim 6 .
12. A display device comprising:
the display medium according to claim 10 ; and
a voltage applying unit that applies a voltage between the pair of substrates of the display medium.
13. A display device comprising:
the display medium according to claim 11 ; and
a voltage applying unit that applies a voltage between the pair of electrodes of the display medium.
14. The particle for display according to claim 1 , wherein the particle satisfies condition (i).