Cabot Corporation

John Mathew

Paul S Palumbo

Geoffrey D Moeser

Joseph E Johnson

Lang H Nguyen

Qingling Zhang

Friedrich K Von Gottberg

William M Porteous

Lynne K LaRochelle Richard

Michael K Chan

Melanie G Lamprey

Miguel A Herrera Fernandez

Koenraad CJ Burger

Benjamin Dupnik

A process for preparing a modified pigment having attached at least one organic group is described. This process comprises the step of reacting a dried mixture comprising a pigment having attached at least one reactive group and a modifying agent. The dried mixture is reacted under high intensity mixing conditions for a time and temperature sufficient to form the modified pigment.

Process for preparing modified pigments

Components of a chemical processing system are disclosed. In particular, a chemical processing system is disclosed which includes a chemical mixing or reacting zone, an inlet to the zone, an outlet to the zone, and a vacuum or fluid flow source located downstream of the outlet. The chemical processing system further includes a device to control the amount of vacuum or fluid flow through the zone. Also disclosed is a continuous feeder system having a first loss-in-weight and a second loss-in-weight feeder and a device for measuring a lower limit of feed in each feeder. There is also a device to activate the second feeder when the lower limit is obtained in the first feeder and a device to deactivate the first feeder when the lower limit is detected in the first feeder. A sample port assembly is also disclosed for obtaining a sample of material flowing through a processing system. The sample port assembly includes a port in the assembly and a sample cup holder adapted to be moved in the port to obtain a sample of material without substantially affecting the fluid pressure or flow within the system. The components of the chemical processing system can be used in processes to make carbon black having attached organic groups.

Chemical processing using a dual feeder system, a sample port assembly, and a fluid flow control system

A process to purify and classify a dispersion containing stabilized particles having counterions and ions as well as free species is disclosed. The solution may comprise an aqueous media, a solvent media, or a combination of both and can include more than one type of aqueous and/or solvent solutions. The process includes at least the steps, in any order, of substantially removing the particles having sizes above about 1 micron, preferably above 0.5 micron; substantially removing the free species; and exchanging at least a portion of the counterions that are a part of the stabilized particles. The process disclosed is especially useful in purifying dispersions where the ionic stabilized colloidal particles are carbon black having attached organic groups comprising at least one ionic group, or at least one ionizable group, or mixtures thereof.

Processes of purifying a dispersion and making inkjet inks

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Hampton, NH, United States of America

John Mathew