| 摘要 |
PURPOSE:To prevent the spread of desensitizing ink to a required color forming part by using a dampening liquid containing a polymer having a propylene oxide unit when printing is made on a color developer sheet with desensitizing ink. CONSTITUTION:For example, N,N-di-polyoxypropylene-3-decyloxypropylamine is used as a desensitizing agent, rosin-modified phenol resin is used as a binder resin, a paraffin is used as a wax, and a titanium dioxide is used as a white pigment. Firstly, the binder resin and the wax are dissolved in the desensitizing agent. The white pigment is added to this solution and made into ink by a three-roll mill. Using this desensitizing ink, an offset printing is made on a color developing surface of no-carbon pressure-sensitive copying paper by a business form printing press. At this time, as a damping liquid, a compound containing a polymer shown by a formula B-Z-OH is used. In the formula, Z contains propylene oxide unit by the amount of 50wt.% or more of the polymer, and R represents hydrogen atom or an organic group, such as alkyl or aryl. |
