Gelled printing ink compositions
A smooth stable viscous gelled printing ink composition comprising a mixture of water, a gelling agent, a chelating agent, and a colorant or pigment, property enhancing additives evenly dispersed into the mixture, and an alkaline electrolyte viscosity increasing agent that raises the pH of the mixture and forms a smooth homogeneous stable gel with a viscosity level having the consistency of a custard or jelly. In addition to the colorants or pigments, additives may also include drying oils, resins, surfactants, film forming components, water flight agents, and other additives. The stabilized gel prevents separation and settling of the homogeneously suspended colorants, pigments, and property enhancing additives, and significantly improves storage stability. The ink compositions do not require shaking, stirring, or mixing prior to use are fast drying on paper, and do not dry on the printing press, in the storage containers, or in the ink jet or bubble jet injector nozzles. The gelled ink compositions with property enhancing additives also have improved non rub-off characteristics, excellent printability, high color strength, good water balance, less mist, and sharp halftone reproduction.
C C
C09D C09D
inventional inventional
James R. Conard E. Jock R.
Collins Kaiser Collins