| 摘要 |
PURPOSE:To obtain a no carbon pressure sensitive copy sheet having excellent effects of contamination resistance and high density coating adaptability without loss of coloring properties by providing a microcapsule containing electron donative colorant, buffer, binder, and composition of specific value of pH containing specific alkaline soluble emulsion on a support. CONSTITUTION:A microcapsule containing electron donative colorant, buffer, binder and composition of 7 of pH containing specific alkaline soluble emulsion are provided on a support. The emulsion is manufactured, for example, by copolymerization of relatively hydrophilic monomer such as methyl acrylate, etc. with unsaturated carboxylic acid, and the type of the carboxylic acid desirably includes, for example, unsaturated dicarboxylic acid such as acrylic acid, methacrylic acid, and particularly desirably includes acrylate copolymer emulsion. The emulsion to be used contains 5% of solid content, 7.0 of pH, and 500-20000cpa of B-type viscosity at 20 deg.C and 60rpm. The number of addenda of the emulsion to 100 pts. of the solid capsule is 0.2-20 pts. The pH of the obtained composition, i.e., coating solution is 7 or more, and the solution is coated by a normal coating machine (coater), and dried. |
