Patent ID: 8810896

Claim:
A rewritable recording medium comprising: a base material; and an image recording layer enclosed by the base material, wherein the image recording layer comprises: electrophoretic particles, magnetophoretic particles, or both electrophoretic particles and magnetophoretic particles; a dispersion medium; and a thermoreversible gelling agent satisfying equation (I): 0.5≦ A/B <3.0 Equation (I) where A denotes the number of silicon atoms contained in siloxane bonds in the molecule of the thermoreversible gelling agent and B denotes the total number of amide bonds and urethane bonds in the molecule of the thermoreversible gelling agent, wherein the dispersion medium is in contact with the base material, and wherein image recording and image erasing can be repeatedly performed on the rewritable recording medium by an external image recording device.