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

Patent metadata

Field	Value
Publication number	US-9910376-B1
Application number	US-201615355670-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 chemically prepared toner composition according to one example embodiment includes a core including a first polymer binder, a colorant and a release agent; a shell that is formed around the core that includes a second polymer binder; and a borax coupling agent between the core and the shell and an alkoxysilane hydrocarbon or combination of different alkoxysilane hydrocarbons that are bonded to the outer surface of the shell using a hydrolytic deposition process. This successful alkoxysilane hydrocarbon surface treatment on the outer surface of the toner particle results in attaining a desirable charge stability in hot and humid environments and ultimately improving the quality of the toner, especially by reducing toner dusting, toner fuming and ultra-fine particles generation.

First claim

What is claimed is:

1. A chemically prepared toner composition, comprising:
a core having an outer surface, the core having components including a first polymer binder, a colorant and a release agent;
a borax coupling agent located on the outer surface of the core;
a shell formed around the outer surface of the core and the borax coupling agent, the shell including a second polymer binder, wherein the core, the borax coupling agent and the shell form a toner particle having an outer surface; and
1,3-di-n-octyltetramethyldisiloxane and diethoxydimethylsilane located on the outer surface of the toner particle, wherein alkoxy groups found in the 1,3-di-n-octyltetramethyldisiloxane and the diethoxydimethylsilane covalently bond with functional groups located on the outer surface of the toner particle.

2. The chemically prepared toner of claim 1 , wherein the first polymer binder and the second polymer binder each include a polyester resin.

3. The chemically prepared toner of claim 1 , wherein the first polymer binder and the second polymer binder each include a styrene polymer.

4. A chemically prepared toner composition, comprising:
a core having an outer surface, the core having components including a first polymer binder, a colorant and a release agent;
a borax coupling agent located on the outer surface of the core;
a shell formed around the outer surface of the core and the borax coupling agent, the shell including a second polymer binder, wherein the core, the borax coupling agent, and the shell form a toner particle having an outer surface; and
n-octadecyltrimethoxysilane located on the outer surface of the toner particle, wherein alkoxy groups found in the n-octadecyltrimethoxysilane covalently bond with 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

• G03G9/09335

  Non-macromolecular organic compounds · CPC title

• G03G9/0819

  characterised by the dimensions of the particles · CPC title

• G03G9/09371

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

• G03G9/09321

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

• G03G9/09364

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