| 摘要 |
PURPOSE:To obtain remarkably high image coloring density and to prevent yellowing owing to nitrogen oxide or the like, by a method wherein novolak type phenol resin is contained as a developer, and a copolymer in which compositions of acrylic amide and acrylic acid are within a range of a specific ratio by weight. CONSTITUTION:The title sheet contains a semisynthetic resin solid acid and a novolak type phenol resin which are manufactured as follows as a developer. A clay mineral having a layer structure composed of a regular tetrahedron of silica is so processed by acid that a SiO2 content becomes 82-96.5wt.% at a dry standard (drying at 105 deg.C for 3hr), and the obtained clay mineral is brought into contact with an at least partly soluble magnesium and/or aluminium compound in an aqueous solvent. When this soluble compound is other materials than hydroxide, it is neutralized with alkali or acid so as to form hydroxide. Magnesium and/or aluminium components are introduced into said acid processed clay mineral, which is dried if necessary. The title sheet further contains, as a developer, a copolymer in which compositions of acrylic amide and acrylic acid are within a range of 90:10-99.5:0.5 by weight ratio. |
