Lexmark International, Inc.

Brian David Munson

Kasturi Rangan Srinivasan

Rahel Bekru Bogale

Trent Duane Peter

Dat Quoc Nguyen

Gerald Hugh Ciecior

Weimei Luo

Mark Thomas Bellino

Scott Daniel Reeves

Tanya Yvonne Thames

Douglas Harris

Vladimir Kantorovich

Peter Nikolaivich Yaron

Cynthia Faye Reeves-Janzen

The present disclosure relates generally to a method to make a chemically prepared toner that employs a crash cooling process. In particular, the crash cooling process involves the addition of a toner slurry having a temperature between 70&#xb0; C. and 90&#xb0; C. to an equivalent amount of cold water having a temperature between 5&#xb0; C. and 20&#xb0; C. Polyester and styrene acrylic toners as well as polyester core shell toners having a borax coupling agent between the toner core and toner shell made from this cooling process results in an improvement to the amount of toner waste, thereby achieving a higher toner usage efficiency for an electrophotographic printing system.

Crash cooling method to prepare toner

An overcoat layer and method to make an overcoated photoconductor drum of an electrophotographic image forming device using irradiation such as with electron beam (EB) or ultraviolet (UV) light is provided. The photoconductor drum is then cured using EB dose of between 10 and 100 kiloGrays (kGy), preferably between 20 and 40 kGys or UV irradiation with an exposure of between 0.1 and 2 J/cm. The unique overcoat layer of the present invention is formed having a biphasic morphology comprised of a highly cured crosslinked phase and a second phase enriched in uncured material. The desired amount of uncured uncrosslinked material found in the second phase of the biphasic structure, is between 2-70 wt % range, with particularly good combination of long-life and electrical performance when present at the 5-50 wt % level, and the best performance at the 15-40 wt % level. The biphasic morphology of the overcoat layer using the method of the present invention gives rise to the good wear rates while allowing rapid transport of the electrical charge and thus fast discharge properties of the photoconductor drum.

Overcoat formulation for long-life electrophotographic photoconductors and method for making the same

A method of quantifying the coverage of extra particulate additives (EPA) on the surface of toner particles is provided. More specifically, this invention is a method using automated image analysis to correctly identify toner and coverage of EPA particles on the surface of the toner.

Method of quantifying coverage of extra particulate additives on the surface of toner particles

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Mead, CO, United States of America

Brian David Munson