Particles for display, particle dispersion for display, display medium and display device

1. Particles for display comprising a colorant, a first polymer gel having a charging group and a second polymer compound having a hydrophilic group, the first polymer gel and the second polymer compound forming an IPN structure or a semi-IPN structure.

2. The particles for display according to claim 1 , wherein the second polymer compound comprises a polymer gel.

3. The particles for display according to claim 1 , wherein the first polymer gel and the second polymer compound form a semi-IPN structure, and wherein the first polymer gel and the second polymer compound are chemically bonded to each other.

4. The particles for display according to claim 1 , wherein the first polymer gel comprises a crosslinked silicone polymer or a crosslinked long-chain alkyl polymer.

5. A particle dispersion for display comprising the particles for display according to claim 1 , and a dispersing medium in which the particles for display are dispersed.

6. The particle dispersion for display according to claim 5 , wherein the second polymer compound comprises a polymer gel.

7. The particle dispersion for display according to claim 5 , wherein the first polymer gel and the second polymer compound form a semi-IPN structure, and wherein the first polymer gel and the second polymer compound are chemically bound to each other.

8. The particle dispersion for display according to claim 5 , wherein the first polymer gel comprises a crosslinked silicone polymer or a crosslinked long-chain alkyl polymer.

9. The particle dispersion for display according to claim 5 , wherein the amount of the dispersing medium that is absorbed by the particles for display at an equilibrium and swollen state is from about 0.1 g/g to about 50 g/g.

10. The particle dispersion for display according to claim 5 , wherein the dispersing medium comprises a paraffin-based solvent or a silicone oil.

11. A display medium comprising:

a pair of substrates, at least one of the pair of substrates being transparent; and

the particle dispersion for display according to claim 5 that is included in a space between the pair of substrates.

12. The display medium according to claim 11 , wherein the second polymer compound comprises a polymer gel.

13. The display medium according to claim 11 , wherein the first polymer gel and the second polymer compound form a semi-IPN structure, and wherein the first polymer gel and the second polymer compound are chemically bonded to each other.

14. The display medium according to claim 11 , wherein the first polymer gel comprises a crosslinked silicone polymer or a crosslinked long-chain alkyl polymer.

15. The display medium according to claim 11 , wherein the amount of the dispersing medium that is absorbed by the particles for display at an equilibrium and swollen state is from about 0.1 g/g to about 50 g/g.

16. The display medium according to claim 11 , wherein the dispersing medium comprises a paraffin-based solvent or a silicone oil.

17. A display device comprising:

a pair of substrates, at least one of the pair of substrates being transparent;

the particle dispersion for display according to claim 5 that is included in a space between the pair of substrates; and

a voltage applying unit that applies a voltage to the pair of substrates.

18. The display device according to claim 17 , wherein the second polymer compound comprises a polymer gel.

19. The display device according to claim 17 , wherein the first polymer gel and the second polymer compound form a semi-IPN structure, and wherein the first polymer gel and the second polymer compound are chemically bonded to each other.

20. The display device according to claim 17 , wherein the amount of the dispersing medium that is absorbed by the particles for display at an equilibrium and swollen state is from about 0.1 g/g to about 50 g/g.