| 摘要 |
PURPOSE:To obtain a color developer composition for a pressure-sensitive recording paper having superior color forming properties and water-resistance and light-resistance of a color forming body, by a method wherein a modified pigment prepared by surface- treating an inorganic pigment selected from among hydroxides and oxides of polyvalent metals with an organic color developer and a binder used for securely bonding the pigment on a substrate sheet are contained. CONSTITUTION:A hydroxide or an oxide of a polyvalent metal having two or more valences, such as magnesium, cadmium, aluminum, zinc, copper, tin, manganese, and silicon, is used in the invention. As an organic color developer, a polyvalent metallic salt of a substituted phenol aldehyde resin or an aromatic carboxylic acid is preferably used. A binder such as a starch, a dextrin, and an acrylic ester copolymer is used in the invention. An inorganic pigment is surface-treated with the organic color developer in such a manner as; the inorganic pigment is added in the organic solvent solution of the organic color developer to prepare an organic solvent solution slurry of the inorganic pigment and, thereafter, the organic solvent is completely removed in a heating or pressure-reducing state and the obtained solid content is powdered to be used as the surface-treating pigment. |
