Gilsonite resin ER 125 Ink

The development work covered in this article compares the use of American Gilsonite Company's product, Environmental Resin ER-125, in rub- resistant web offset blacks, versus the Asian and European use of rosin modified phenolics. While phenolic systems are not common in the U.S., they can produce inks of ultimate rub resistance. With the use of suitable gelling agents, phenolic systems can be made to lithograph extremely well at very high speeds on all types of presses.
Secondly, the work looks at using combinations of ER-125 and Gilsonite to alter flow and rheology to produce inks that are suited to all common ducts systems including overshot, undershot, and rail system without the need for flow agents such as treated clay.

Modified Phenolic Systems

The introduction of high-speed web offset presses for the printing of high quality newspapers in Europe, Australia, and parts of Asia over the last decade has seen the development of inks that truly have almost no scuff in time frames as low as four hours after printing. This unique performance has in some cases been achieved by the use of high viscosity rosin modified phenolic resins that retain good solubility in low aromatic distillates and compatibility in vegetable oils such as Soy and Canola oils. These inks, because of the binding capacity of the resin, are able to use low-cost carbons normally only associated with the rubber industry . The final balance of ingredients produces an ink of superb transfer, good strength, easy water balance, and above all, fast set and the ultimate in scuff resistance.

These systems employ Gilsonite to aid in pigment wetting and, because of the predominance of overshot ink ducts, generally prefer the lower viscosity grades such as American Gilsonite Company's Selects 300 Grade.

ER - 125 SYSTEM

Environmental Resi n ER - 125 from American Gilsonite is a refined natural fossil resin that has been extensively cleaned and de - aromatized. It is not Gilsonite but made from Gilsonite. Via solvent extraction, ER - 125 Resin is almost totally pure aliphatic hydrocarbon with less than 0.05 percent impurity content. The final result is a low - cost resin, bituminous in nature, with excellent pigment wetting and long flow. ER solutions are totally stable in aliphatic and vegetable oils and require little, if any, filtration.
Using ER - 125 Resin as a replacement for the modified phenolic resin results in the following varnish formula: While the viscosity is lower than the phenolic system, the ratio of the Laray to Brookfield viscosity is 55 in both cases, indicating similar flow characteristics.

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