Patent ID: 7935657

Claim:
A recording medium for thermal transfer printers comprising: a base layer; a dye accepting layer applied to a surface of the base layer; an inorganic material aid layer interposed between the base layer and the dye accepting layer, the inorganic material aid layer containing an organic binder resin, an inorganic material having a mean particle diameter of 10 μm or greater, and a brightening agent, and an undercoating layer between the base layer and the inorganic material aid layer, the undercoating layer including a dye, or a brightening agent, the undercoating layer selected from the group consisting of a polyol resin, polyurethane resin, acrylic resin and vinyl resin, and where the undercoat layer has a thickness of 0.1 to 5 μm; wherein the inorganic material is silica, and the brightening agent is at least one material selected from the group consisting of titanium dioxide, calcium carbonate, clay, and zinc oxide, and the silica is present in a ratio to the organic binder of 90:10 to 10:90.