George D Marshall

US Patent:

6350552, Feb 26, 2002

Filed:

Dec 23, 1998

Appl. No.:

09/219950

Inventors:

Bryan Patrick Livengood - Longmont CO
Brian William Baird - Louisville CO
George Pharris Marshall - Boulder CO

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 9087

US Classification:

43010822, 4301081, 43010824, 4301083, 4301084, 43013718

Abstract:

A toner composition comprising a primary resin and at least one additional polymeric component is improved by reactive compatibilization of the additional polymeric component and the resin. For example, effective amounts of a functional secondary resin and a functional silicone oil having functionality reactive therewith are included and mixed by extrusion so as to reduce or eliminate speckling in printing with the toner and to improve toner powder flow.

US Patent:

6544710, Apr 8, 2003

Filed:

Jul 2, 2001

Appl. No.:

09/897866

Inventors:

Bryan Patrick Livengood - Longmont CO
Brian William Baird - Louisville CO
George Pharris Marshall - Boulder CO

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 9087

US Classification:

4301371, 4301081, 43010822, 43010824, 4301083, 4301093, 43013718

Abstract:

A toner composition comprising a primary resin and at least one additional polymeric component is improved by reactive compatibilization of the additional polymeric component and the resin. For example, effective amounts of a functional secondary resin and a functional silicone oil having functionality reactive therewith are included and mixed by extrusion so as to reduce or eliminate speckling in printing with the toner and the improve toner powder flow.

US Patent:

6787279, Sep 7, 2004

Filed:

Jun 20, 2001

Appl. No.:

09/885311

Inventors:

Bryan Patrick Livengood - Longmont CO
George P. Marshall - Boulder CO
John Melvin Olson - Boulder CO

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 9087

US Classification:

4301084, 4301088, 4301093

Abstract:

The present invention is a random copolymer and its use to compatibilize the components of mixtures of immiscible polymeric materials used in the preparation of toner formulations.

US Patent:

6991886, Jan 31, 2006

Filed:

Jun 7, 2004

Appl. No.:

10/862871

Inventors:

John Joseph Earley - Boulder CO, US
George Pharris Marshall - Boulder CO, US
John Melvin Olson - Boulder CO, US
Trent Duane Peter - Johnstown CO, US
Minerva Piffarerio - Erie CO, US
Vincent Wen-Hwa Ting - Boulder CO, US
Ronald James Whildin - Boulder CO, US

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 13/14

US Classification:

4301371, 43013716, 4301103

Abstract:

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.

US Patent:

7510812, Mar 31, 2009

Filed:

Mar 28, 2006

Appl. No.:

11/391121

Inventors:

John Earley - Boulder CO, US
Rick Jones - Berthoud CO, US
George Marshall - Boulder CO, US
John Olson - Boulder County CO, US

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 9/08

US Classification:

4301087, 4301101, 4301114

Abstract:

The present invention relates to toner compositions containing extra particulate additives. The additives may include a mixture of silica particles having differing BET surface areas and may include an acicular inorganic oxide. The control of such additives may be relied upon to control toner performance with respect to functional performance considerations such as filming and/or overall print quality.

US Patent:

8313880, Nov 20, 2012

Filed:

Aug 13, 2009

Appl. No.:

12/540577

Inventors:

Danielle Renee Ashley - Longmont CO, US
James Robert Combes - Boulder CO, US
John Joseph Earley - Boulder CO, US
Lale Gokbudak Lovell - Longmont CO, US
George Pharris Marshall - Denver CO, US
Walter Mychajlowskij - Superior CO, US

Assignee:

Lexmark International, Inc. - Lexington KY

International Classification:

G03G 9/087

US Classification:

4301093, 4301091, 4301114, 4301371

Abstract:

The present disclosure relates to a magenta toner formulation that may be used in a toner printer cartridge for an electrophotographic printer. The magenta toner may include polymer resin binder containing three polymer resins with different number average molecular weight values. The concentration of such polymer resins may be selected to provide a desired temperature versus viscosity behavior for the magenta toner that may be configured to conform to the viscosity versus temperature provide for yellow, cyan and black toner.

US Patent:

20070231727, Oct 4, 2007

Filed:

Mar 31, 2006

Appl. No.:

11/395692

Inventors:

Brian Baird - Louisville CO, US
John Earley - Boulder CO, US
Yueping Fu - Longmont CO, US
Rick Jones - Berthoud CO, US
Lale Lovell - Longmont CO, US
George Marshall - Boulder CO, US
John Olson - Boulder CO, US

International Classification:

G03G 9/08

US Classification:

430108400, 430108100, 430110100, 430108600, 430108700

Abstract:

The present invention relates to the use of extra particulate additives in selected chemically processed toner compositions for use in an image forming apparatus. The extra particulate additive may have a controlled aspect ratio and be combined with the chemically processed toner. The chemically processed toner may provide toner particles having controlled diameters and rheological properties that may be combined with a release agent. The release agent may also be selected with respect to, e.g., concentration and/or mean domain size within the toner particles including considerations of coating chemistry and/or DSC melting behavior.

US Patent:

20080090166, Apr 17, 2008

Filed:

Oct 13, 2006

Appl. No.:

11/549225

Inventors:

Rick Owen Jones - Berthoud CO, US
George Pharris Marshall - Denver CO, US
John Melvin Olson - Boulder CO, US

International Classification:

G03G 9/08

US Classification:

4301371

Abstract:

The present invention relates to the combination of a chemically processed toner with extra particulate additive in a conical mixer. The toner may include polymer resins having a glass transition temperature (Tg) wherein the mixer and/or toner may be maintained below the glass transition temperature during mixing. Prior to mixing the toner particles may also be de-agglomerated or mechanically agitated.