| 摘要 |
A reversible thermal recording material improved in durability such as bending resistance and abrasion resistance when a medium is deformed or washed, an IC chip built-in communication medium resistant to external stress and excellent in printing suitability. A recording material having a layer structure hard to cause curling. The reversible thermal recording material has a structure in which a display base material mainly containing PET having a reversible thermal recording layer and a support mainly containing polyester elastomer consisting of specific hard segment and soft segment are bonded together by an adhesive layer. The communication medium comprises a display member provided with a display base material and a display layer on the display base material, an IC inlet disposed on the display base material sided of the display member and mounted with an IC chip joined with a reinforcing plate meeting specific mechanical conditions, and a holding layer covering the IC inlet, the bending elastic modulus of the communication medium being 100-2000MPa. The recording material comprises a display layer provided on the front surface of a base material, and a curl preventing layer provided on the rear surface of the base material, wherein the curl preventing layer includes an adhesive layer positioned on the base material side and a synthetic resin-made holding layer laid on the adhesive layer, a ratio between the linear expansion coefficient of the display layer and that of at least one of the adhesive layer and the holding layer is 1:5 through 5:1, and the storage elastic modulus of at least one of the adhesive layer and the holding layer is 0.01-1.5GPa.
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