Arizona Chemical Company, LLC

Zheng Lu

Theodore J Williams

Thomas C Jordan

The specification discloses a method for treating a pigment presscake containing pigment and water to remove the water therefrom. The method is carried out by contacting the presscake with a flushing agent containing an uncatalyzed or acid catalyzed rosin ester and an ink oil to provide a mixture containing the pigment, the flushing agent and water which is then separated from the mixture by well known separation techniques such as decanting to provide a flushed pigment. The specification also discloses a flushing agent and an ink composition containing the uncatalyzed or acid catalyzed rosin ester.

Flushed pigments and method for making flushed pigments

The specification describes a process for making gelled ink resins which exhibit improved properties. In a preferred embodiment, a rosin-based or hydrocarbon-based resin is mixed with an organic solvent and reacted with a crosslink agent under conditions sufficient to produce a substantially covalently cross-link gelled resin. The resulting gelled resin resists viscosity breakdown under high shear conditions and may be used directly for making ink compositions, obviating the need for further gelation and avoiding the use of conventional organo-metallic gelling agents.

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Panama City, FL, United States of America

Zheng Lu