Fluorocarbon-containing printing ink and process for image printing

DETAILED DESCRIPTION The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows: 1.
In a printing ink comprising a dye or pigment coloring agent, a water or organic liquid vehicle, and a surfactant, the improvement comprising incorporation therein of from 0.
01% to 1.
0%, based on total weight, of the surfactant C.
sub.
n F.
sub.
2n.
sub.
+1 CH.
sub.
2 CH.
sub.
2 O(CH.
sub.
2 CH.
sub.
2 O).
sub.
x H where n has an average value of about 7 and x has an average value of about 10.
6.




Description:
BACKGROUND OF THE INVENTION 1.
Field of the Invention This invention concerns image-printing or imaging, i.
e.
printing letters, characters, figures (patterns) on a substrate.
More specifically the invention concerns an improved process for image-printing and certain improved printing inks that contain particular fluorocarbon surfactants having the CF.
sub.
3 (cf.
sub.
2).
sub.
3 moiety.
2.
Description of the Prior Art or The art of printing has been defined as the act, art, or practice of impressing letters, characters, of figures (patterns) on a substrate, and can be termed more particularly as "imaging.
" Imaging demands a precision of transfer from printing plate to substrate not required when, say, a continuous coating is applied by printing or an application of coloring agent is made by brush or roller.
Printing inks are composed basically of two parts, a dye or pigment coloring agent which forms the record of print or other image pattern left on the substrate, and a vehicle which aids in transfer of the coloring agent.
Printing inks are commonly divided into three main classes; typographic, planographic and intaglio, corresponding to the three major divisions of printing.
Each of these three different classes of inks has properties different from the other two.
Recently, a process has been developed for coating the inactive side of pressure-sensitive adhesive tape with an ink containing a fluorocarbon surfactant.
The tape can be converted to rolls, where the fluoro compound helps to keep the inactive side of the tape from sticking to the side bearing the adhesive