Front face erasable microcapsule magnetophoretic erasing magnet

• US 20060147754A1
• Filed: 11/30/2005
• Published: 07/06/2006
• Est. Priority Date: 12/25/2001
• Status: Abandoned Application

• Current Assignee: Chemitech, Inc., Tocom Corporation
• Original Assignee: Chemitech, Inc., Tocom Corporation
• Inventors: Iwasaki, Takashi, Nonaka, Kenji, Yashuhara, Takuya, Igaue, Sadatoshi
• Application Number:
  US11/291,070
• Publication Number:
  US 20060147754A1
• Time in Patent Office: Days
• US Class Current: 428/692.100
• CPC Class Codes: B43L 1/008 with magnetic action
• CPC Class Codes: B43L 1/045 with magnetic action
• CPC Class Codes: B43L 19/0031 comprising magnetic particles therein
• CPC Class Codes: B43L 21/00 Blackboard or slate cleaning devices
• CPC Class Codes: G02F 1/09 based on magneto-optical elements, e.g. exhibiting Faraday effect
• CPC Class Codes: G02F 1/094 based on magnetophoretic effect
• CPC Class Codes: G09F 9/375 the position of the elements being controlled by the application of a magnetic field
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/254 Polymeric or resinous material
• CPC Class Codes: Y10T 428/2984 Microcapsule with fluid core [includes liposome]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/32 Composite [nonstructural laminate] of inorganic material having metal-compound-containing layer and having defined magnetic layer

Abstract

Disclosed herein is a front face erasable microcapsule magnetophoretic display sheet having a support and a solid dispersion layer provided on one surface of the support and composed of microcapsules having an average particle diameter of 50 to 650 μm, in which a liquid dispersion, a white pigment, additives and magnetic particles are encapsulated, and a binder. The magnetic particles include at least two kinds of magnetic particles different in particle diameter from each other. An erasing magnet for front face erasing and a writing magnet for front face erasable microcapsule magnetophoretic display sheet are also disclosed.

Claims

1-5. -5. (canceled)

6. An erasing device for front face erasing, which is adapted to slide over at least a part of the associated front face of an associated front face erasable microcapsule magnetophoretic display sheet, wherein the device comprises:

at least one magnetic portion;

at least one non-magnetic portion, the non-magnetic portion adapted to control the generation of a magnetic field, the non-magnetic portion being a non-magnetic material; and

,

wherein the arrangement of the magnetic and non-magnetic portions in relation to each other creates a magnetic field comprising multiple magnetic lines, wherein portions of the magnetic lines are almost horizontally acting on the magnetic portion at a position somewhat distant from the magnetic portion.

8. The device of claim 6, wherein the type of magnetization of the magnetic portion is double-sided magnetization IP.

9. The device of claim 8, wherein the magnetic portion further comprises a surface magnetic flux density of 100 to 750 G.

12. The device of claim 6, wherein the magnetic portion is selected from rare earth cobalt magnet, rare earth iron magnet, bond magnet, isotropic rare earth magnet, anisotropic rare earth magnet, or ferrite magnet.

7. (canceled)

10-11. -11. (canceled)

13-42. -42. (canceled)