| 摘要 |
PROBLEM TO BE SOLVED: To provide a microcapsule for pressure sensitive copying paper having a melamine-formalin resin wall film, hardly causing contamination. SOLUTION: In the manufacturing method of the microcapsule wherein a hydrophobic solution, containing an electron donor colorless dye, is emulsified and dispersed into a hydrophilic solution and, thereafter, is mixed into the precondensate of melamine-formaldehyde to form the wall film, the melamine- formaldehyde precondensate, having a turbidity within the range of 0-0.5 after two min of dilution by distilled water of 20 deg.C to the density of 3%, is employed. |
