Patent ID: 7354884

Claim:
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, the binder being a urethane-based resin and a styrene-butadiene-based resin; (c) a protective layer formed on the heat-sensitive recording layer, and containing an aqueous resin as a main ingredient, the aqueous resin being an acetoacetyl-modified polyvinyl alcohol having a polymerization degree of 1500 to 3000 and a saponification degree of at least 95 mol %, the protective layer further containing a fluorine-containing surfactant and at least one compound selected from the group consisting of alkyl phosphate salts, waxes and higher fatty acid amides; 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, as the pigment, in the backside layer spherical resin particles having a mean volume particle diameter of 2 to 15 Î¼m in an amount of 0.2 to 5.0 mass % of the backside layer, the average thickness of the backside layer being 0.5 to 10 Î¼m and being less than or equal to the mean volume particle diameter of the spherical resin particles contained in the backside layer, and the binder in the backside layer being a (meth)acrylamide-based resin binder having a glass transition temperature of 180 to 250Â° C. and an ionomeric urethane-based resin, the ionomeric urethane-based resin being contained in an amount of 3 to 30 mass % of all the binders.