Abstract: Disclosed are an adhesive sheet comprising a release sheet base material, an undercoat layer formed on the release sheet base material, a release agent layer formed on the undercoat layer, an adhesive layer formed on the release agent layer and a surface sheet formed on the adhesive layer, the adhesive sheet being characterized in that the undercoat layer comprises a water-dispersible acrylate or methacrylate copolymer resin having an emulsifier content of about 2 to about 10 wt. % based on the total amount of the monomers used for preparing the copolymer and which resin has a glass transition temperature of about -60.degree. to about 20.degree. C., and that the release sheet base material having the undercoat layer formed thereon, as a whole, has a bulk density of up to 1.0 g/cm.sup.3, and a process for preparing a release sheet comprising a release sheet base material, an undercoat layer and a relase agent layer.

Abstract: An image-receiving sheet for a heat transfer recording system. The sheet comprises a substrate coated with an image-receiving layer comprised mainly of non-plate-shaped inorganic pigment and a binder. The smoothness of the image-receiving surface as determined according to TAPPI Standard T479 om-81 is 200 to 1,000 sec/10 ml, and the air permeability of the image-receiving sheet, as determined according to ASTM D726 Method B is below 500 sec/100 ml.