A coating composition is applied to a print stock substrate for preparing a thermally-active layer, the coating composition comprising: a developer comprising at least one or a combination of 6'-dipentylamino-3'-methyl-2'(phenylamino)-spiro [isobenzofuran-1(3H),9'-[9H]xanthen]-3-one (CAS No. 129473-78-5) and 6'-dibutylamino-3'-methyl-2'(phenylamino)-spiro [isobenzofuran-1(3H),9'-[9H]xanthen]-3-one (CAS No. 89331-94-2); a sensitizer comprising at least one or a combination of 1,1'-sulfonylbisbenzene (CAS No. 127-63-9) and dimethylterephthalate (CAS No. 120-61-6); and a coreactant (or developer) comprising at least one or a combination of bis(4-hydroxyphenyl)-4-methylpentane (CAS No. 6807-17-6) and 4-hydroxy-4'-isopropoxydiphenylsulfone (CAS No. 95235-30-6). Preferably, the print stock substrate will be coated with clay or the like to provide a smooth coating surface for the thermally-active layer. Also preferably, the thermally-active layer will be overcoated with a protective layer.

Una composición de capa se aplica a un substrato de la acción de la impresión para preparar una capa termal-activa, el abarcar de capa de la composición: un revelador que abarca por lo menos uno o una combinación de 6'-dipentylamino-3'-methyl-2'(phenylamino)-spiro [ isobenzofuran-1(3H), 9'-[9H]xanthen]-3-one (CAS No. 129473-78-5) y 6'-dibutylamino-3'-methyl-2'(phenylamino)-spiro [ isobenzofuran-1(3H), 9'-[9H]xanthen]-3-one (CAS No. 89331-94-2); un sensitizer que abarca por lo menos uno o una combinación de 1,1'-sulfonylbisbenzene (CAS No. 127-63-9) y del dimethylterephthalate (CAS No. 120-61-6); y un coreactant (o revelador) abarcando por lo menos uno o una combinación de bis(4-hydroxyphenyl)-4-methylpentane (CAS No. 6807-17-6) y de 4-hydroxy-4'-isopropoxydiphenylsulfone (CAS No. 95235-30-6). Preferiblemente, el substrato de la acción de la impresión estará cubierto con la arcilla o los similares para proporcionar una superficie de capa lisa para la capa termal-activa. También preferiblemente, la capa termal-activa será recubierta con una capa protectora.

 
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