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

• US 8,587,859 B2
• Filed: 11/25/2011
• Issued: 11/19/2013
• Est. Priority Date: 06/23/2011
• Status: Active Grant

• Current Assignee: E Ink Corporation (E Ink Holdings Incorporated)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Kayashima, Hiroshi, Kawahara, Jun
• Primary Examiner(s): Ben, Loha
• Application Number:
  US13/304,488
• Publication Number:
  US 20120327504A1
• Time in Patent Office: 725 Days
• Field of Search: 359/296, 359/452, 345/107, 428/402, 428/405, 428/407, 525/477, 525/479, 526/336, 526/347, 524/267, 524/268, 524/730, 556/430
• US Class Current: 359/296
• CPC Class Codes: C01P 2006/22 Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values
• CPC Class Codes: C09C 1/021 Calcium carbonates
• CPC Class Codes: C09C 3/10 Treatment with macromolecular organic compounds C09C3/006 takes precedence
• CPC Class Codes: G02F 1/167 by electrophoresis
• CPC Class Codes: G02F 1/1679 Gaskets; Spacers; Sealing of cells; Filling or closing of cells
• CPC Class Codes: G02F 2001/1678 characterised by the composition or particle type
• CPC Class Codes: Y10T 428/2995 Silane, siloxane or silicone coating
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer

Abstract

A white particle for display includes as a constituent element a polymer including at least one species selected from a biphenyl compound having one vinyl group and a biphenyl compound having two vinyl groups as a polymeric component.

Claims

1. A white particle for display comprising as a constituent element:

a polymer including at least one species selected from a biphenyl compound having one vinyl group and a biphenyl compound having two vinyl groups as a polymeric component.

2. The white particle for display according to claim 1, wherein the biphenyl compound having one vinyl group is monovinyl biphenyl and the biphenyl compound having two vinyl groups is divinyl biphenyl.

3. The white particle for display according to claim 1, wherein the polymer is a copolymer of the polymeric component including at least one species selected from the biphenyl compound having one vinyl group and the biphenyl compound having two vinyl groups and a polymeric component having a silicone chain.

4. The white particle for display according to claim 3, wherein the polymeric component having the silicone chain is a dimethyl silicone compound having an acrylate group or a methacrylate group at one terminal.

5. The white particle for display according to claim 3, wherein the polymeric component having the silicone chain is a compound expressed by Structural Formula 1:

6. A particle dispersion for display comprising:

a particle group including the white particle for display according to claim 1; and

a dispersion medium that is used to disperse the particle group.

7. A display medium comprising:

a pair of substrates of which at least one has a light-transmitting property and that is disposed with a gap interposed therebetween;

an electrophoretic particle group that is enclosed between the pair of substrates and that is electrophoresed in accordance with an electric field;

a white particle group that is enclosed between the pair of substrates and that includes the white particle for display according to claim 1; and

a dispersion medium that is enclosed between the pair of substrates and that is used to disperse the electrophoretic particle group and the white particle group.

8. A display device comprising:

a display medium according to claim 7; and

an electric field generating unit that generates an electric field between the pair of substrates.

9. A white particle for display comprising:

an inorganic white particle; and

a coating layer with which the inorganic white particle is coated and that includes as a constituent component a polymer including at least one species selected from a biphenyl compound having one vinyl group and a biphenyl compound having two vinyl groups as a polymeric component.

10. The white particle for display according to claim 9, wherein the biphenyl compound having one vinyl group is monovinyl biphenyl and the biphenyl compound having two vinyl groups is divinyl biphenyl.

11. The white particle for display according to claim 9, wherein the polymer is a copolymer of the polymeric component including at least one species selected from the biphenyl compound having one vinyl group and the biphenyl compound having two vinyl groups and a polymeric component having a silicone chain.

12. The white particle for display according to claim 11, wherein the polymeric component having the silicone chain is a dimethyl silicone compound having an acrylate group or a methacrylate group at one terminal.

13. The white particle for display according to claim 11, wherein the polymeric component having the silicone chain is a compound expressed by Structural Formula 1:

14. A particle dispersion for display comprising:

a particle group including the white particle for display according to claim 9; and

a dispersion medium that is used to disperse the particle group.

15. A display medium comprising:

a pair of substrates of which at least one has a light-transmitting property and that is disposed with a gap interposed therebetween;

an electrophoretic particle group that is enclosed between the pair of substrates and that is electrophoresed in accordance with an electric field;

a white particle group that is enclosed between the pair of substrates and that includes the white particle for display according to claim 9; and

a dispersion medium that is enclosed between the pair of substrates and that is used to disperse the electrophoretic particle group and the white particle group.

16. A display device comprising:

a display medium according to claim 15; and

an electric field generating unit that generates an electric field between the pair of substrates.