Front face erasable microcapsule magnetophoretic display sheet, erasing magnet and writing magnet

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.

1 - 18 . (canceled)  
   
   
       19 . An erasing magnet/display sheet apparatus for front face erasing, which is adapted to slide over at least a part of the front face of the front face erasable microcapsule magnetophoretic display sheet, wherein the apparatus comprises: 
 at least one magnetic portion;    at least one non-magnetic portion, the non-magnetic portion creating a clearance between the front face erasable microcapsule magnetophoretic display sheet and the magnetic portion; and,    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.    
   
   
       20 . The apparatus of  claim 19 , wherein the type of magnetization of the magnet is double-sided magnetization IP.  
   
   
       21 . The apparatus of  claim 20 , wherein the magnet further comprises a surface magnetic flux density of 100 to 750 G.  
   
   
       22 . The apparatus of  claim 21 , wherein the clearance is a non-magnetic layer.  
   
   
       23 . The apparatus of  claim 19  wherein the the non-magnetic portion is selected from an air layer, resin, sponge, sponge resin, rubber, wood, corrugated board, paper, fiber, glass, or metal.  
   
   
       24 - 42 . (canceled)