Optical recording media with thermal coloration and process for producing same

Claim 1

An optical recording medium with thermal coloration capable of monochromatic or multi-colored coloration which optical recording medium comprises: a substrate capable of transmitting visible and near infrared light, a first coloring agent layer consisting of a transparent leuco-dye, said first coloring agent layer formed by vacuum deposition on said substrate, wherein said lueco-dye is selected from the group consisting of 3,3-bis (p-dimethylamino phenyl)-6-dimethylaminophthalide, 3,3-bis (p-dimethylamino phenyl) phthalide, 3-chloro-6-cyclohexylamino fluoran, 3-diphenylamino 8-diethylamino fluoran, 3-chlorophenyl-methlyamino 8-diethylamino fluoran, and 3-methyl 3-phenylamino 8-diethylamino fluoran, a first light absorber layer formed by vacuum depostion on said first coloring agent layer and capable of absorbing a first wavelength light from a recording light source, wherein said first light absorber layer consists of a compound selected from the group consisting of copper phthalocyanine, fluorescein, vanadyl phthalocyanine, aluminum phthalocyanine, bis-(cis-1,2 toluyl) ethylene 1,2 dithiolate nickel, bis-(1-chloro 3,4-dithiophenolate) nickel, bis-(4-dimethylamino 1,2 dithiophenolate) nickel, N-dimethylaminonaphthal squarrium, and N-diethylamino-naphthol squarrium, and a first developer layer consisting of a transparent solid acid, said first developer layer formed by vacuum deposition on said first light absorber layer, whereby said first light absorber layer is interposed between said first coloring agent layer and said first developer layer, wherein said solid acid is selected from the group consisting of phenolphthalein, thymolphthalein, alizarin, morin, quercetin, 2,2 bis (4-hydroxyphenyl) propane, a mixture of 2,2 bis (4-hydroxyphenyl) propane and stearic acid amide having the ratio of 1:1 by weight, a 4 hydroxy phenoxide and a mixture of 4-hydroxy phenoxide and methylol amide having the ratio of 1:2 by weight.