DEVELOPING SHEET FOR CARBONLESS PRESSURE-SENSITIVE COPY PAPER

摘要

PURPOSE:To enhance developed color density and the light fastness of a developed color image while reducing the coating amount of an org. developer by adding latex having a two-layer structure consisting of a nucleus particle composed a styrenic copolymer and a surface layer composed of a butadiene copolymer as the binder of the white pigment mixed with a polyvalent salt of aromatic carboxylic acid and/or a polyvalent metal compound of a salicylic acid resin being an org. developer. CONSTITUTION:Latex having a two-layer structure wherein a nucleus particle is composed of a styrenic copolymer and a surface layer is composed of a butadiene copolymer is used as the binder of a coating layer coated with an electron acceptive substance forming a color upon the contact with an electron donating substance. As the electron acceptive substance, a polyvalent metal salt of aromatic carboxylic acid and/or a polyvalent metal compound of a salicylic acid resin are used. A developing sheet using the polyvalent metal salt of aromatic carboxylic acid and/or the polyvalent metal compound of the salicylic acid resin reduced in yellowing among org. developers is enhanced in developed color density and excellent in the light fastness of a developed color image and can be reduced in the coating amount of a developer.