Toner formulation having a silane surface treated on its outer surface and method of preparing the same

Patent metadata

Field	Value
Publication number	US-9910377-B1
Application number	US-201615355698-A
Country	US
Kind code	B1
Filing date	Nov 18, 2016
Priority date	Nov 18, 2016
Publication date	Mar 6, 2018
Grant date	Mar 6, 2018

Abstract

A method for producing core shell toner for electrophotography according to one embodiment, includes surface treating the outer surface of a core shell toner particle with a alkoxysilane hydrocarbon or combination of different alkoxysilane hydrocarbons using a hydrolytic deposition process after the core shell toner particle is fully formed. This method results in the bonding of the alkoxysilane hydrocarbon or combination of different alkoxysilane hydrocarbons to the outer surface of the core shell toner particle. In an alternative method, the outer surface of the toner is surface treated with the alkoxysilane hydrocarbon solution and then fused to form toner particles. The alkoxysilane hydrocarbon surface treated core shell toner also can be mixed with magnetic carrier beads to form a developer mix to be used in a dual component development electrophotographic printer.

First claim

What is claimed is:

1. A method for producing toner comprising:
combining and agglomerating a first polymer emulsion with a pigment dispersion and a wax dispersion to form toner cores;
adding a borax coupling agent to the toner cores once the toner cores reach a predetermined size;
combining and agglomerating a second polymer emulsion with the toner cores to form toner shells around the toner cores;
fusing the aggregated toner cores and toner shells to form toner particles; and
treating the surface of the formed toner particles with 1,3-di-n-octyltetramethyldisiloxane and diethoxydimethylsilane, wherein alkoxy groups in the 1,3-di-n-octyltetramethyldisiloxane and the diethoxydimethylsilane covalently bond to functional groups located on the outer surface of the toner particle.

2. A method for producing toner comprising:
combining and agglomerating a first polymer emulsion with a pigment dispersion and a wax dispersion to form toner cores;
adding a borax coupling agent to the toner cores once the toner cores reach a predetermined size;
combining and agglomerating a second polymer emulsion with the toner cores to form toner shells around the toner cores;
fusing the aggregated toner cores and toner shells to form toner particles; and
treating the surface of the formed toner particles with n-octadecyltrimethoxysilane, wherein alkoxy groups in the n-octadecyltrimethoxysilane covalently bond to functional groups located on the outer surface of the toner particle.

Assignees

• Lexmark Int Inc

Inventors

• Ashley Danielle Renee
• Bejat Ligia Aura
• Bensing Michael James
• Grant Ashley Schafer
• Hammond Cory Nathan
• Jones Rick Owen
• Kraseski John Joseph
• Sun Jing X

Classifications

• G03G9/09342

  Inorganic compounds · CPC title

• G03G9/0812

  Pretreatment of components · CPC title

• G03G9/08755

  Polyesters · CPC title

• G03G9/09364

  obtained by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• G03G9/09307

  specified by the shell material · CPC title