| 摘要 |
PURPOSE:To enable enhancement of a transparency and enlargement of a color reproduction area, by providing an ink layer in which a coloring material having naphthol azo group or chlorophenyl azo group is dispersed in a wax of paraffin series by using a surface-active agent of nitrogen-containing series. CONSTITUTION:An ink layer is made of, particularly, a material in which a coloring material having naphthol azo group or chlorophenyl azo group is dispersed in a wax of paraffin series by using a surface-active agent of nitrogen- containing series. In the aforesaid ink layer, because a good affinity between a coloring material having naphthol azo group or chlorophenyl azo group and a surface-active agent or nitrogen-containing series results in a remarkably good dispersion of the coloring material in the wax of paraffin series, the transparency is enhanced to a great extent, and moreover, since the transparency curve is nearing an ideal spectrum, a wide color reproduction area is realized. The coloring material of naphthol azo group series such as oxyethylene alkylamine or/and polyoxyethylene alkylamine is effectively used. |
