US Patent 7354884 Thermal recording material

Disclosed is a heat-sensitive recording material comprising(a) a transparent film,(b) a heat-sensitive recording layer formed on one side of the transparent film, and containing an electron-donating compound, an electron-accepting compound, and a binder,(c) a protective layer formed on the heat-sensitive recording layer, and containing an aqueous resin as a primary component; and(d) a backside layer formed on the other side of the transparent film, and containing a pigment and a binder; the heat-sensitive recording material containing in the backside layer spherical resin particles having a mean volume particle diameter of 2 to 15 μm in an amount of 0.2 to 5.0 mass % of the backside layer.