Abstract: A reversible thermosensitive recording material which includes a recording layer including an electron donating coloring agent and an electron accepting coloring developer and in which an image is reversibly formed and erased by appropriately heating and cooling the recording layer, wherein the recording material has an image density retention not less than about 60% when the recording material having an image is allowed to settle in a dry place at 50.degree. C. for 24 hours, a residual image density not greater than about 0.03 when the recording material having an image is heated at 110.degree. C. for 0.5 seconds to erase the image, and a residual image density after light irradiation not greater than about 0.04 when the recording material having an image is heated at 110.degree. C. for 0.5 seconds to erase the image after light of 5,000 lux is irradiated to the recording material for 100 hours.

Abstract: A reversible thermosensitive recording medium has a support, and a reversible thermosensitive recording layer, an intermediate layer and a protective layer which are successively overlaid on the support in this order, the recording layer containing a reversible thermosensitive coloring composition which includes an electron-donating coloring compound and an electron-accepting compound and is capable of assuming a colored state and/or a decolorized state by controlling the thermal energy applied to the coloring composition or the cooling rate of the coloring composition after the application of thermal energy thereto, and the intermediate layer and/or protective layer containing an inorganic pigment material with an average particle diameter of 100 nm or less.

Abstract: A reversible thermosensitive recording material which includes a recording layer including a resin, an electron donating coloring agent and an electron accepting coloring developer and in which an image is reversibly formed and erased by appropriately heating and cooling the recording layer, wherein the resin includes a resin crosslinked with the isocyanate compound. The reversible thermosensitive recording material has good image recording/erasing ability, and good durability.

Abstract: A reversible thermosensitive composition including a coloring agent and a developer and capable of assuming a colored state and a discolored state depending upon the thermal hysteresis thereof. The developer is a phenol compound represented by the formula: ##STR1## wherein R.sup.1 represents a substituted or non-substituted divalent hydrocarbon group having at least two carbon atoms, R.sup.2 represents a substituted or non-substituted hydrocarbon group, X and Y represent, independently from each other, a divalent group having a hetero atom and r is an integer of between 1 and 3. A reversible thermosensitive recording medium includes a support and a thermosensitive layer including the above composition.

Abstract: A thermal image transfer recording medium includes a support and a thermal image transfer ink layer formed on the support. The thermal image transfer ink layer contains a coloring agent, a resin with a melting point of 120.degree. C. or more and an SP value of 10.5 to 12.5, and a melt viscosity lowering material for lowering the melt viscosity of the resin, with the compatibility of the resin and the melt viscosity lowering material, measured by a transparency measurement method, being 0.20 or less, or with the melt viscosity at 150.degree. C. of the thermal image transfer ink layer being in the range of 1.times.10.sup.2 to 5.times.10.sup.6 poise.

Abstract: A thermal image transfer recording medium is composed of a support and a thermofusible ink layer formed on the support, with the water-content ratio of the recording medium excluding the support being in the range of 0.3 to 4.0 wt. % of the total weight of the recording medium excluding the support.

Abstract: A thermal image transfer recording medium is composed of a support and a thermofusible ink layer formed thereon, and the thermofusible ink layer contains as the main components a coloring agent, a wax component and a rubber elastomer component which is discontinuously dispersed in the form of layers in the thermofusible ink layer, or is composed of a first ink layer containing a wax component and a rubber elastomer and a second ink layer containing a coloring agent, a wax component and a binder resin, which is overlaid on the first ink layer.