| 摘要 |
<p>The invention relates to an ink ribbon adapted to be overwritten in overlapping manner and consisting of a carrier foil to which is applied an ink-releasing coating in the form of a plastic matrix with ink pigment dispersed therein and an ink paste, on a mineral oil base, containing fillers and wetting agents. The ink paste oil base is a mineral oil containing 25 to 40% of aromatic hydrocarbons in which 30 to 40% of the saturatedly bonded C-atoms are cycloaliphatically combined. The wetting agent used is from the fatty amine salt group, while the filler is a finely divided, storage effective filler having a large internal surface The viscosity of the ink paste is adjusted to a range of 4000 to 10,000 mPa.s (at 20.degree.C). The filler is preferably kieselguhr, precipitated silicic acid, activated char-coal and/or burst hollow spheres having a particle size distribution of 0.2 to 10 .mu.m, and the wetting agent is preferably a fatty acid salt of a fatty propylene diamine of the general formula R-NH-(CH2)3-NH2. This ink ribbon is particularly suitable for high speed type wheel printers and is characterized in that it permits a more than five-fold overstrike with uniformly deep black and sharp-edged script intensity.</p> |
