Lexmark International, Inc.

Vincent Wen-Hwa Ting

Bryan Patrick Livengood

Jing X Sun

John Melvin Olson

Michael James Bensing

John Joseph Kraseski

Michael Thomas Moore

Minerva Piffarerio

David Glenn Black

Ronald Harold Levin

Craig Michael Bertelsen

Dat Quoc Nguyen

Trent Duane Peter

George P Marshall

James Craig Minor

John Joseph Earley

Franklin Dilworth Zartman

Craig Michael Bartelsen

Bradford Lee Taylor

Ronald James Whildin

An emulsion aggregation toner formulation for electrophotography and a method for preparation thereof. The emulsion aggregation toner formulation includes a polyester resin emulsion formed using an extruded polyester binder resin having a broad molecular weight distribution. The extruded polyester binder resin is formed using a plurality of polyester binder resins. Further, the emulsion aggregation toner formulation comprises at least one colorant dispersion and a wax dispersion.

Emulsion aggregation toner formulation

Toner is rounded by vigorously mixing less than about 5 percent by weight of particulate silica to the total weight of a starting toner in a closed, recirculating air system. The starting toner contains at least about 4.5 percent by weight of the starting toner of a wax and additionally contains at least 5 percent by weight of the starting toner of a softening agent. The temperature during the mixing is no more than 13 degrees C. above the onset of the glass transition temperature of the starting toner. The final toner comprises rounded starting toner having particulate silica embedded during the mixing process.

Closed air circulation toner rounding

Charge transport layers comprise a charge transport compound and binder including styrene-acrylic resin. Dual layer photoconductors comprise a substrate, a charge transport layer as described, and a charge generation layer.

Dual layer photoconductors with charge transport layer including styrene-acrylic resin

Toner particulates comprise a styrene/acrylic copolymer having a first aliphatic hydrocarbon wax incorporated therein during polyermization of the copolymer, and a second aliphatic hydrocarbon wax mixed with the copolymer.

Toner particulates comprising aliphatic hydrocarbon waxes

Toner particulates include a first resin comprising a cross-linked copolymer; a second resin comprising a non-cross-linked copolymer; and a wax comprising an ethylene propylene copolymer. The cross-linked copolymer is a copolymer other than the wax comprising an ethylene propylene copolymer and the non-cross-linked polymer is a copolymer other than the wax comprising an ethylene propylene copolymer.

Toner particulates comprising an ethylene propylene wax

Growing community of inventors

Boulder, CO, United States of America

Vincent Wen-Hwa Ting