Gilsonite heat set ink formulation

Environmental Resin ER-125 is a hydrocarbon-based resin created by American Gilsonite Company for use in all types of black offset inks. The resin is soluble in aliphatic mineral distillates, comparable with hydrocarbon, phenolic and alkyd resins, and creates varnishes with low and stable viscosities. ER-125 is almost totally pure aliphatic hydrocarbon with less than 0.05 percent impurity content.

Performance Comparisons of Heatset Ink Formulations

AGC's research shows that Environmental Resin ER-125 can provide the heatset ink maker with several major advantages. Several benefits can be achieved by using ER-125 Resin as either a full or partial replacement of the hydrocarbon (C5-C9's), phenolic and alkyd resins commonly found in black heatset ink recipes. ER-125 Resin's major benefits in a black heatset ink can be summarized as follows: - greatly increased flow;
- low tack and excellent tack stability;
- low tack and high gloss level at the same time;
- high gloss level at lower solids level;
- no misting;
- excellent carbon black wetting; and
- reduces raw material costs about 10 percent to 15 percent
ables 1 and 2 outline the logic employed in the research experiments. Seven different heatset ink formul ations were compared. Each comparison changed one ingredient from the previous recipe to study the performance effect of that single change. For example, Column 1 uses Gilsonite Selects 300 Grade in the grinding media compared to Column 2 using ER - 125 Resi n. The objective of this change is to demonstrate that ER Resin wets carbon black as well as Gilsonite. Then, use Column 2 as a base. Columns 3 through 7 show how effective ER - 125 Resin is as a replacement for the hydrocarbon, phenolic and alkyd resins in Column 2's formulation.

The objective of each comparison is summarized above in Table 2:

In our research, the resin modified phenolic resin used is Worleefen F - 120. This is a fast setting, high gloss resin from Greece with a 120° C melting point and a vi scosity of 1 Pascal second (30 percent solids in linseed oil). The unmodified hydrocarbon resin from Taiwan is SK - 150 with a 150° C softening point. The alkyd resin used is Worleekyd L - 3, a linseed oil - based product with 9 Pa.s. Viscosity, a 79 percent oil content and an acid value of 15.
The aliphatic solvent used is from Haltermann Oil Company in Germany. The PKWF 4/7 solvent has a boiling point range from 240° C to 270° C, a 20 percent aromatic content and a 72° C aniline point. Since the ink maker will produce a heatset ink by first making a free - flow varnish, then a grinding media, and finally a gel varnish, Tables 3 through 5 outline the individual formulations for each of these components. The objective of the free - flow varnish manufacture was to prod uce four varnishes with approximately the same viscosity, using one resin each - Gilsonite, ER - 125, phenolic and hydrocarbon. These varnishes were essentially 50 percent resin plus 50 percent aliphatic solvent, except for FF#3, which required extra solvent to yield the desired viscosity . Please note that the initial viscosity of the Gilsonite varnish was very high and not equivalent to the other three.

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